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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Wed, 3 Feb 2021 12:49:40 +0000
Cc: Stewart Bryant <stewart.bryant@gmail.com>
To: draft-jia-scenarios-flexible-address-structure@ietf.org, draft-jia-flex-ip-address-structure@ietf.org, flexip@ietf.org, int-area <int-area@ietf.org>
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Subject: [Flexip] Using ISO8473 as a network layer to carry flexible addresses
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Re drafts:
=20
=
https://datatracker.ietf.org/doc/draft-jia-scenarios-flexible-address-stru=
cture/ =
<https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatat=
racker.ietf.org%2Fdoc%2Fdraft-jia-scenarios-flexible-address-structure%2F&=
data=3D04%7C01%7Ckiranm%40futurewei.com%7C95b5d102feaf4674ab8408d8c7972448=
%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637478799262464227%7CUnknown=
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reserved=3D0>
https://datatracker.ietf.org/doc/draft-jia-flex-ip-address-structure/ =
<https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatat=
racker.ietf.org%2Fdoc%2Fdraft-jia-flex-ip-address-structure%2F&data=3D04%7=
C01%7Ckiranm%40futurewei.com%7C95b5d102feaf4674ab8408d8c7972448%7C0fee8ff2=
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000&sdata=3DXB9VFEQiaa0ZMjG5BuF%2FPeQnvFcmGgfY0%2Bye4s7CSoA%3D&reserved=3D=
0>
Since the authors are interested in network layer protocols that support =
multiple address types and multiple address lengths, I wonder if they =
have considered using ISO8473 as the bearer and developing that to their =
needs?
ISO 8473 is also known as ITU X233 (it costs money to download from ISO, =
but seems to be free from the ITU-T site). It is an in force and =
actually well deployed network layer protocol with many similar =
characteristics to IPv6. The reason that it is deployed is that it is =
used to support SS7. It also has a very widely deployed link-state IGP =
since IS-IS was developed to support ISO8474 and later adapted to =
support IP late run its life.=20
It was one of the contenders for IPv4 replacement, and so there RFCs =
that authors may study: RFC994 is a copy of the late version of the spec =
in RFC format. Then there is RFC1195 where Ross Callon shows how it =
works in an IETF environment carrying IETF transport protocols and this =
eventually became RFC1347 (TUBA), which whilst whilst marked Historic in =
the IETF RFC collection is almost certainly still implementable since =
the base network layer protocol is still an active standard.
It would need some work to determine the applicability of the protocol =
to your application and the feasibility of adding the necessary new =
address types (due to crowding of the existing address registry) and any =
other extensions that you might need.
Note BTW that it supports source routing functionality and so ought to =
be usable in an SR environment should that be needed.
There would also need to be work to see how feasible it would be to =
implement in a modern NPU, though having implemented it in a hardware =
assisted microcode platform that is quite similar to a modern NPU back =
in the 90s and having got quite creditable performance I think it is =
feasible to run this on modern hardware including repurposing the =
existing longest match engine to look up a number of your new address =
formats.=20
There are a bunch of specs here for your convenience although I have not =
studied the list in detail
http://www.networksorcery.com/enp/protocol/clnp.htm
Best regards
Stewart





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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div =
class=3D""><div style=3D"margin: 0in; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Re drafts:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><pre style=3D"margin: =
0in 0in 1rem; font-family: &quot;Courier New&quot;; box-sizing: =
border-box; white-space: pre-wrap; caret-color: rgb(33, 37, 41); =
overflow: auto;" class=3D""><span style=3D"font-family: Consolas; color: =
rgb(33, 37, 41);" class=3D""><a =
href=3D"https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fdatatracker.ietf.org%2Fdoc%2Fdraft-jia-scenarios-flexible-address-struct=
ure%2F&amp;data=3D04%7C01%7Ckiranm%40futurewei.com%7C95b5d102feaf4674ab840=
8d8c7972448%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C63747879926246422=
7%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1h=
aWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3DyDi0mFnbU60nFC5PJC%2BAAWVIdSMT%2FY8U=
O0XIiK3J4iI%3D&amp;reserved=3D0" style=3D"color: blue;" class=3D""><span =
style=3D"color: rgb(51, 122, 183); text-decoration: none;" =
class=3D"">https://datatracker.ietf.org/doc/draft-jia-scenarios-flexible-a=
ddress-structure/</span></a><o:p class=3D""></o:p></span></pre><div =
class=3D""><pre style=3D"margin: 0in 0in 1rem; font-family: =
&quot;Courier New&quot;; box-sizing: border-box; white-space: pre-wrap; =
caret-color: rgb(33, 37, 41); overflow: auto;" class=3D""><span =
style=3D"font-family: Consolas; color: rgb(33, 37, 41);" class=3D""><span =
style=3D"color: rgb(51, 122, 183); text-decoration: none;" class=3D""><a =
href=3D"https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fdatatracker.ietf.org%2Fdoc%2Fdraft-jia-flex-ip-address-structure%2F&amp;=
data=3D04%7C01%7Ckiranm%40futurewei.com%7C95b5d102feaf4674ab8408d8c7972448=
%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637478799262464227%7CUnknown=
%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI=
6Mn0%3D%7C1000&amp;sdata=3DXB9VFEQiaa0ZMjG5BuF%2FPeQnvFcmGgfY0%2Bye4s7CSoA=
%3D&amp;reserved=3D0" style=3D"color: blue;" =
class=3D"">https://datatracker.ietf.org/doc/draft-jia-flex-ip-address-stru=
cture/</a></span><o:p class=3D""></o:p></span></pre><pre style=3D"margin: =
0in 0in 1rem; box-sizing: border-box; overflow: auto;" class=3D""><font =
color=3D"#212529" face=3D"Consolas" class=3D""><span style=3D"white-space:=
 pre-wrap;" class=3D"">Since the authors are interested in network layer =
protocols that support multiple address types and multiple address =
lengths, I wonder if they have considered using ISO8473 as the bearer =
and developing that to their needs?</span></font></pre><pre =
style=3D"margin: 0in 0in 1rem; box-sizing: border-box; overflow: auto;" =
class=3D""><font color=3D"#212529" face=3D"Consolas" class=3D""><span =
style=3D"white-space: pre-wrap;" class=3D"">ISO 8473 is also known as =
ITU X233 (it costs money to download from ISO, but seems to be free from =
the ITU-T site). It is an in force and actually well deployed network =
layer protocol with many similar characteristics to IPv6. The reason =
that it is deployed is that it is used to support SS7. It also has a =
very widely deployed link-state IGP since IS-IS was developed to support =
ISO8474 and later adapted to support IP late run its life. =
</span></font></pre><pre style=3D"margin: 0in 0in 1rem; box-sizing: =
border-box; overflow: auto;" class=3D""><font color=3D"#212529" =
face=3D"Consolas" class=3D""><span style=3D"white-space: pre-wrap;" =
class=3D"">It was one of the contenders for IPv4 </span><span =
style=3D"caret-color: rgb(33, 37, 41); white-space: pre-wrap;" =
class=3D"">replacement, and so there RFCs that authors may study: RFC994 =
is a copy of the late version of the spec in RFC format. Then there is =
RFC1195 where Ross Callon shows how it works in an IETF environment =
carrying IETF transport protocols and this eventually became RFC1347 =
(TUBA), which whilst whilst marked Historic in the IETF RFC collection =
is almost certainly still implementable since the base network layer =
protocol is still an active standard.</span></font></pre><pre =
style=3D"margin: 0in 0in 1rem; box-sizing: border-box; overflow: auto;" =
class=3D""><font color=3D"#212529" face=3D"Consolas" class=3D""><span =
style=3D"white-space: pre-wrap;" class=3D"">It would need some work to =
determine the applicability of the protocol to your application and the =
feasibility of adding the necessary new address types (due to crowding =
of the existing address registry) and any other extensions that you =
might need.</span></font></pre><pre style=3D"margin: 0in 0in 1rem; =
box-sizing: border-box; overflow: auto;" class=3D""><span =
style=3D"white-space: pre-wrap; color: rgb(33, 37, 41); font-family: =
Consolas;" class=3D"">Note BTW that it supports source routing =
functionality and so ought to be usable in an SR environment should that =
be needed.</span></pre><pre style=3D"margin: 0in 0in 1rem; box-sizing: =
border-box; overflow: auto;" class=3D""><font color=3D"#212529" =
face=3D"Consolas" class=3D""><span style=3D"white-space: pre-wrap;" =
class=3D"">There would also need to be work to see how feasible it would =
be to implement in a modern NPU, though having implemented it in a =
hardware assisted microcode platform that is quite similar to a modern =
NPU back in the 90s and having got quite creditable performance I think =
it is feasible to run this on modern hardware including repurposing the =
existing longest match engine to look up a number of your new address =
formats. </span></font></pre><pre style=3D"margin: 0in 0in 1rem; =
box-sizing: border-box; overflow: auto;" class=3D""><font =
color=3D"#212529" face=3D"Consolas" class=3D""><span style=3D"white-space:=
 pre-wrap;" class=3D"">There are a bunch of specs here for your =
convenience although I have not studied the list in =
detail</span></font></pre><pre style=3D"margin: 0in 0in 1rem; =
box-sizing: border-box; overflow: auto;" class=3D""><font =
color=3D"#212529" face=3D"Consolas" class=3D""><span style=3D"caret-color:=
 rgb(33, 37, 41); white-space: pre-wrap;" class=3D""><a =
href=3D"http://www.networksorcery.com/enp/protocol/clnp.htm" =
class=3D"">http://www.networksorcery.com/enp/protocol/clnp.htm</a></span><=
/font></pre><pre style=3D"margin: 0in 0in 1rem; box-sizing: border-box; =
overflow: auto;" class=3D""><font color=3D"#212529" face=3D"Consolas" =
class=3D""><span style=3D"caret-color: rgb(33, 37, 41); white-space: =
pre-wrap;" class=3D"">Best regards</span></font></pre><pre =
style=3D"margin: 0in 0in 1rem; box-sizing: border-box; overflow: auto;" =
class=3D""><font color=3D"#212529" face=3D"Consolas" class=3D""><span =
style=3D"caret-color: rgb(33, 37, 41); white-space: pre-wrap;" =
class=3D"">Stewart</span></font></pre><pre style=3D"margin: 0in 0in =
1rem; box-sizing: border-box; overflow: auto;" class=3D""><font =
color=3D"#212529" face=3D"Consolas" class=3D""><span style=3D"caret-color:=
 rgb(33, 37, 41); white-space: pre-wrap;" class=3D""><br =
class=3D""></span></font></pre><pre style=3D"margin: 0in 0in 1rem; =
box-sizing: border-box; overflow: auto;" class=3D""><font =
color=3D"#212529" face=3D"Consolas" class=3D""><span style=3D"caret-color:=
 rgb(33, 37, 41); white-space: pre-wrap;" class=3D""><br =
class=3D""></span></font></pre><pre style=3D"margin: 0in 0in 1rem; =
box-sizing: border-box; overflow: auto;" class=3D""><font =
color=3D"#212529" face=3D"Consolas" class=3D""><span style=3D"white-space:=
 pre-wrap;" class=3D""><br class=3D""></span></font></pre><div =
class=3D""><br =
class=3D"webkit-block-placeholder"></div></div></div></body></html>=

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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Wed, 3 Feb 2021 14:08:37 +0000
Cc: Stewart Bryant <stewart.bryant@gmail.com>
To: draft-jia-scenarios-flexible-address-structure@ietf.org, draft-jia-flex-ip-address-structure@ietf.org, flexip@ietf.org, int-area <int-area@ietf.org>
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Subject: [Flexip] The small address use case in FlexIP
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=20
Re drafts:
=20
=
https://datatracker.ietf.org/doc/draft-jia-scenarios-flexible-address-stru=
cture/ =
<https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatat=
racker.ietf.org%2Fdoc%2Fdraft-jia-scenarios-flexible-address-structure%2F&=
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https://datatracker.ietf.org/doc/draft-jia-flex-ip-address-structure/ =
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0>
I have a number of comments these drafts, but in this email I would like =
to focus on the small address proposal. By this I mean addresses that =
are shorter than 64bits.
=20
It seems to me that there are 3 operational reasons for small addresses:
=20
1) That you might be worried about the amount of packet taken up by the =
addresses.
=20
2) That you might be worried about the amount of energy required to send =
a packet.
=20
3) That you want to use an address that is somehow native to a legacy =
application.

=E2=80=A6 and there are at least to implementation reasons:

4) That you might be worried about the amount of memory in the FIB.
=20
5) That you might wish to optimise out the FIB hardware.=20
=20
There are two approaches to the case of addresses that are are =
relatively short, where for the purposes of this discussion I define =
=E2=80=9Crelatively short=E2=80=9D as an address between 8 and 64 bits =
in length.

One approach is to design and implement a new packet type, be that an =
original design, or the repurposing of a suitable existing non-IP =
design. If that is what you have in mind it would greatly assist =
consideration of your work if you published that design in the IETF, or =
at least pointed to it as an accessible document. That would allow us to =
debate the properties of the packet and or your address proposal in the =
context of the packet design. An alternative approach which needs to be =
considered is to make the FlexIP address a suffix of an existing and =
well known address type such as IPv6. In such a case by standardising =
the corresponding IPv6 prefix you may produce implementation =
simplifications, or alternatively by making it a prefix well known in =
the domain you construct quite an effective leakage prevention =
mechanism.

Consider the IPv6 suffix case. Validating a well-know prefix before =
invoking the address lookup machinery is a simple efficient process =
using either one of more compare operators, or some hw technique such as =
a special register. Certainly we could build hw to look up a small set =
of well-known prefixes that burns a lot less energy than used in a full =
address lookup. So that brings us to looking up the suffix and, by =
definition the table used to do that is small.
In other words most of the efficiency of doing a short address lookup =
can be maintained even if the address is the suffix of a longer address =
provided that the implementation is optimised for this case.
=20
I think that argument covers much of use cases 3, 4 and 5. This applies =
to your Indexes 1..EF, F0, F1 and F2 in your propose address design.
=20
In your F5 case a longest match engine will work by definition on a =
variable length address, provided it is short enough that sufficient =
addresses from the primary address space can be deployed to this. Note =
that you can throw the address length into the longest match engine if =
you wish and it will simply consume it and if correctly programmed will =
return the correct result. Thus any of the address definitions that do =
not contain discontinuous substructure such as the cases with inbuilt =
segment routing can be looked up in a common hardware address =
recognition engine without analysis of the first byte.
=20
Now I think that it is worth looking at case 1 and 2 above and noting =
there is some applicability to both the short address cases and the =
segment routing case with short addresses that you propose.
=20
Of course it is very difficult to do an accurate analysis these cases =
because the packet design that FlexIP is going to be used with is not =
referenced by the drafts.
=20
Let us assume a tiny packet:
=20
14B of MAC header (Lora is 13 to 28, Ethernet is 14)
8B of UDP
2B of payload
=20
That is 24B + NW layer (the addresses plus the overhead)
=20
Now consider IPv6 which is pretty minimalist for a connectionless packet =
apart from the size of its addresses.
=20
IPv6 is 40B=20
=20
So total of 64B for the packet which is the benchmark since it is the =
IETF plan of record for most applications.
=20
If we reduce the addresses to 1B (the minimum in these drafts) i.e. =
subtract 32 - 2 =3D 30 so best case is packet of 34B.=20
=20
That is a useful saving 47% which might be important in some specialist =
applications where bandwidth or radio energy was important, however  =
much depends on what the practical size of the payload in, and what =
options or extensions are in the packet to fulfil the  communications =
needs. So for example if I were to need an additional 20B of packet =
option and payload the saving is reduced to 36% reducing to 20% saving =
if 100B were needed. A 20% saving is not worth the cost and complexity =
of changing the packet.
=20
So, to understand the benefit of reducing the address size and =
presumably using it in an as yet undefined packet format it is necessary =
for the authors to describe the application for small standalone =
addresses (as opposed to address suffixes) in a lot more detail than is =
provided in the scenarios document, in particular the size of the =
transport layer, and the size of the expected payload. Additionally it =
is necessary that they describe the details of the network layer packet =
and its MAC environment.
=20
Once more detail is know, we will know whether there is a case for small =
native addresses or whether we should focus our attention on how to map =
such addresses as suffixes of a larger well known address type such as =
IPv6.
=20
- Stewart=

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div =
class=3D""><div style=3D"margin: 0in; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span style=3D"font-size: 11pt;" =
class=3D"">&nbsp;</span></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">Re =
drafts:<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><pre style=3D"margin: 0in 0in 1rem; font-size: 10pt; =
font-family: &quot;Courier New&quot;; box-sizing: border-box; =
white-space: pre-wrap; caret-color: rgb(33, 37, 41); overflow: auto;" =
class=3D""><span style=3D"font-size: 9pt; font-family: Consolas; color: =
rgb(33, 37, 41);" class=3D""><a =
href=3D"https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fdatatracker.ietf.org%2Fdoc%2Fdraft-jia-scenarios-flexible-address-struct=
ure%2F&amp;data=3D04%7C01%7Ckiranm%40futurewei.com%7C95b5d102feaf4674ab840=
8d8c7972448%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C63747879926246422=
7%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1h=
aWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3DyDi0mFnbU60nFC5PJC%2BAAWVIdSMT%2FY8U=
O0XIiK3J4iI%3D&amp;reserved=3D0" style=3D"color: blue;" class=3D""><span =
style=3D"color: rgb(51, 122, 183); text-decoration: none;" =
class=3D"">https://datatracker.ietf.org/doc/draft-jia-scenarios-flexible-a=
ddress-structure/</span></a><o:p class=3D""></o:p></span></pre><div =
class=3D""><pre style=3D"margin: 0in 0in 1rem; font-size: 10pt; =
font-family: &quot;Courier New&quot;; box-sizing: border-box; =
white-space: pre-wrap; caret-color: rgb(33, 37, 41); overflow: auto;" =
class=3D""><span style=3D"font-size: 9pt; font-family: Consolas; color: =
rgb(33, 37, 41);" class=3D""><a =
href=3D"https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%=
2Fdatatracker.ietf.org%2Fdoc%2Fdraft-jia-flex-ip-address-structure%2F&amp;=
data=3D04%7C01%7Ckiranm%40futurewei.com%7C95b5d102feaf4674ab8408d8c7972448=
%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637478799262464227%7CUnknown=
%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI=
6Mn0%3D%7C1000&amp;sdata=3DXB9VFEQiaa0ZMjG5BuF%2FPeQnvFcmGgfY0%2Bye4s7CSoA=
%3D&amp;reserved=3D0" style=3D"color: blue;" class=3D""><span =
style=3D"color: rgb(51, 122, 183); text-decoration: none;" =
class=3D"">https://datatracker.ietf.org/doc/draft-jia-flex-ip-address-stru=
cture/</span></a><o:p class=3D""></o:p></span></pre><div class=3D""><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">I have a number of comments these drafts, but in =
this email I would like to focus on the small address proposal. By this =
I mean addresses that are shorter than 64bits.<o:p =
class=3D""></o:p></div></div></div></div><div class=3D""><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">It seems to me that there are 3 =
operational reasons for small addresses:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">1) =
That you might be worried about the amount of packet taken up by the =
addresses.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">2) That you might be worried about the =
amount of energy required to send a packet.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">3) =
That you want to use an address that is somehow native to a legacy =
application.</div><div style=3D"margin: 0in; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"font-size: =
11pt;" class=3D""><br class=3D""></span></div><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">=E2=80=A6 =
and there are at least to implementation reasons:</div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D""><br class=3D""></div><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D""></o:p><span style=3D"font-size: 11pt;" class=3D"">4) That you =
might be worried about the amount of memory in the FIB.</span></div><div =
class=3D""><div style=3D"margin: 0in; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">5) =
That you might wish to optimise out the FIB =
hardware.&nbsp;</div></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">There =
are two approaches to the case of addresses that are are relatively =
short, where for the purposes of this discussion I define =E2=80=9Crelativ=
ely short=E2=80=9D as an address between 8 and 64 bits in =
length.</div><div style=3D"margin: 0in; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><br class=3D""></div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">One approach is to design and implement a new =
packet type, be that an original design, or the repurposing of a =
suitable existing non-IP design. If that is what you have in mind it =
would greatly assist consideration of your work if you published that =
design in the IETF, or at least pointed to it as an accessible document. =
That would allow us to debate the properties of the packet and or your =
address proposal in the context of the packet design. An alternative =
approach which needs to be considered is to make the FlexIP address a =
suffix of an existing and well known address type such as IPv6. In such =
a case by standardising the corresponding IPv6 prefix you may produce =
implementation simplifications, or alternatively by making it a prefix =
well known in the domain you construct quite an effective leakage =
prevention mechanism.</div></div><div style=3D"margin: 0in; font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D""><br =
class=3D""></div><div style=3D"margin: 0in; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">Consider the IPv6 suffix =
case.&nbsp;<span style=3D"font-size: 11pt;" class=3D"">Validating a =
well-know prefix before invoking the address lookup machinery is a =
simple efficient process using either one of more compare operators, or =
some hw technique such as a special register. Certainly we could build =
hw to look up a small set of well-known prefixes that burns a lot less =
energy than used in a full address lookup. So that brings us to looking =
up the suffix and, by definition the table used to do that is =
small.</span></div><div class=3D""><div style=3D"margin: 0in; font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">In other =
words most of the efficiency of doing a short address lookup can be =
maintained even if the address is the suffix of a longer address =
provided that the implementation is optimised for this case.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">I =
think that argument covers much of use cases 3, 4 and 5. This applies to =
your Indexes 1..EF, F0, F1 and F2 in your propose address design.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">In =
your F5 case a longest match engine will work by definition on a =
variable length address, provided it is short enough that sufficient =
addresses from the primary address space can be deployed to this. Note =
that you can throw the address length into the longest match engine if =
you wish and it will simply consume it and if correctly programmed will =
return the correct result. Thus any of the address definitions that do =
not contain discontinuous substructure such as the cases with inbuilt =
segment routing can be looked up in a common hardware address =
recognition engine without analysis of the first byte.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">Now =
I think that it is worth looking at case 1 and 2 above and noting there =
is some applicability to both the short address cases and the segment =
routing case with short addresses that you propose.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">Of =
course it is very difficult to do an accurate analysis these cases =
because the packet design that FlexIP is going to be used with is not =
referenced by the drafts.<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0in; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">Let us assume a tiny packet:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">14B =
of MAC header (Lora is 13 to 28, Ethernet is 14)<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">8B of =
UDP<o:p class=3D""></o:p></div></div><div class=3D""><div style=3D"margin:=
 0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">2B =
of payload<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">That is 24B + NW layer (the addresses =
plus the overhead)<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Now consider IPv6 which is pretty =
minimalist for a connectionless packet apart from the size of its =
addresses.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">IPv6 is 40B&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">So =
total of 64B for the packet which is the benchmark since it is the IETF =
plan of record for most applications.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">If =
we reduce the addresses to 1B (the minimum in these drafts) i.e. =
subtract 32 - 2 =3D 30 so best case is packet of 34B.&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">That =
is a useful saving 47% which might be important in some specialist =
applications where bandwidth or radio energy was important, however =
&nbsp;much depends on what the practical size of the payload in, and =
what options or extensions are in the packet to fulfil the =
&nbsp;communications needs. So for example if I were to need an =
additional 20B of packet option and payload the saving is reduced to 36% =
reducing to 20% saving if 100B were needed. A 20% saving is not worth =
the cost and complexity of changing the packet.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">So, =
to understand the benefit of reducing the address size and presumably =
using it in an as yet undefined packet format it is necessary for the =
authors to describe the application for small standalone addresses (as =
opposed to address suffixes) in a lot more detail than is provided in =
the scenarios document, in particular the size of the transport layer, =
and the size of the expected payload. Additionally it is necessary that =
they describe the details of the network layer packet and its MAC =
environment.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Once more detail is know, we will know =
whether there is a case for small native addresses or whether we should =
focus our attention on how to map such addresses as suffixes of a larger =
well known address type such as IPv6.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">- =
Stewart</div></div></div></body></html>=

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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Fri, 5 Feb 2021 14:31:48 +0000
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Cc: Stewart Bryant <stewart.bryant@gmail.com>, int-area <int-area@ietf.org>, "flexip@ietf.org" <flexip@ietf.org>, "draft-jia-flex-ip-address-structure@ietf.org" <draft-jia-flex-ip-address-structure@ietf.org>,  "draft-jia-scenarios-flexible-address-structure@ietf.org" <draft-jia-scenarios-flexible-address-structure@ietf.org>,  "sarikaya2012@gmail.com" <sarikaya2012@gmail.com>, Lin Han <lin.han@futurewei.com>
To: Jiayihao <jiayihao@huawei.com>
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Subject: Re: [Flexip] The small address use case in FlexIP
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> On 5 Feb 2021, at 12:06, Jiayihao <jiayihao@huawei.com> wrote:
>=20
> - As mentioned in "http://acticom.de/internet-of-things-iot/ =
<http://acticom.de/internet-of-things-iot/>", a typical payload size =
equals just around 25 bytes per IPv6 datagram. Thus typically the saving =
rate will be ((14+10+25)-(14+40+25))/(14+40+25)=3D38%. So typically, a =
38% saving may be a good motivation for having a short address. However, =
we'd like to postpone quantitative analysis after we have a rough =
consensus on problems due to addressing aspects.=20

Sorry, but I think you have to discuss the quantitive aspects of the =
problem as part of understanding whether this is worth doing or not.

You have to ask if a  38% saving is worth the huge CAPEX and OPEX costs =
and feed that into the discussion.

If we are going to argue for short packets that is another matter, and =
that would not simply be an addressing discussion.

For example in a lot of applications the traffic is between a device and =
a gateway. If we allowed an out of band session setup we could support =
something like 500K sessions in the network with just a 4 byte network =
header.

So classic Ether + Classic IPv6 + 25 =3D 79B
   Reduced address in IPv6           =3D 49B (0.62 of size)
   4B n/w layer                      =3D 43B (0.54 of size)

So about 50% is the best we can achieve. Of course many of you will =
realise that there exists a 4B session oriented packet format and is one =
that almost every router already supports.

I think that this means that we need to have the conversation about =
small addresses within a much bigger context in terms of style of =
network communication and intended outcome and the scenarios document =
does not really do that analysis, but if the goal is simply minimum =
address size we do have an approach that we could in principle deploy =
today between a device and a gateway, and we should explore that.

If the requirements is a connectionless service then we really have to =
understand how to balance the economic cost of deploying a new packet =
design against a 38% saving of packet size.

Best regards

Stewart







--Apple-Mail=_A7D8DC0D-F5E6-4F64-8D5D-5DBF40142CD9
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On 5 Feb 2021, at 12:06, Jiayihao &lt;<a =
href=3D"mailto:jiayihao@huawei.com" class=3D"">jiayihao@huawei.com</a>&gt;=
 wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><span=
 style=3D"caret-color: rgb(0, 0, 0); font-family: Calibri, sans-serif; =
font-size: 14px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: justify; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none; float: none; display: inline !important;" class=3D"">- As =
mentioned in "</span><a href=3D"http://acticom.de/internet-of-things-iot/"=
 style=3D"color: rgb(149, 79, 114); text-decoration: underline; =
font-family: Calibri, sans-serif; font-size: 14px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: justify; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" =
class=3D"">http://acticom.de/internet-of-things-iot/</a><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Calibri, sans-serif; =
font-size: 14px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: justify; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none; float: none; display: inline !important;" class=3D"">", a typical =
payload size equals just around 25 bytes per IPv6 datagram. Thus =
typically the saving rate will be =
((14+10+25)-(14+40+25))/(14+40+25)=3D38%. So typically, a 38% saving may =
be a good motivation for having a short address. However, we'd like to =
postpone quantitative analysis after we have a rough consensus on =
problems due to addressing =
aspects.&nbsp;</span></div></blockquote></div><br class=3D""><div =
class=3D"">Sorry, but I think you have to discuss the quantitive aspects =
of the problem as part of understanding whether this is worth doing or =
not.</div><div class=3D""><br class=3D""></div><div class=3D"">You have =
to ask if a &nbsp;38% saving is worth the huge CAPEX and OPEX costs and =
feed that into the discussion.</div><div class=3D""><br =
class=3D""></div><div class=3D"">If we are going to argue for short =
packets that is another matter, and that would not simply be an =
addressing discussion.</div><div class=3D""><br class=3D""></div><div =
class=3D"">For example in a lot of applications the traffic is between a =
device and a gateway. If we allowed an out of band session setup we =
could support something like 500K sessions in the network with just a 4 =
byte network header.</div><div class=3D""><br class=3D""></div><div =
class=3D""><font face=3D"Courier New" class=3D"">So classic Ether + =
Classic IPv6 + 25 =3D 79B</font></div><div class=3D""><font =
face=3D"Courier New" class=3D"">&nbsp; &nbsp;Reduced address in IPv6 =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =3D 49B (0.62 of =
size)</font></div><div class=3D""><font face=3D"Courier New" =
class=3D"">&nbsp; &nbsp;4B n/w layer &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=3D 43B (0.54 of =
size)</font></div><div class=3D""><font face=3D"Courier New" =
class=3D""><br class=3D""></font></div><div class=3D"">So&nbsp;about 50% =
is the best we can&nbsp;achieve. Of course many of you will realise that =
there exists a 4B session oriented packet format and is one that almost =
every router already supports.</div><div class=3D""><br =
class=3D""></div><div class=3D"">I think that this means that we need to =
have the conversation about small addresses within a much bigger context =
in terms of style of network communication and intended outcome and the =
scenarios document does not really do that analysis, but if the goal is =
simply minimum address size we do have an approach that we could in =
principle deploy today between a device and a gateway, and we should =
explore that.</div><div class=3D""><br class=3D""></div><div class=3D"">If=
 the requirements is a connectionless service then we really have to =
understand how to balance the economic cost of deploying a new packet =
design against a 38% saving of packet size.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Best regards</div><div class=3D""><br =
class=3D""></div><div class=3D"">Stewart</div><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""></div></body></html>=

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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Fri, 5 Feb 2021 14:46:20 +0000
In-Reply-To: <727cfc33b0cb41acaeacc21a33c39d4d@huawei.com>
Cc: Stewart Bryant <stewart.bryant@gmail.com>, int-area <int-area@ietf.org>, "flexip@ietf.org" <flexip@ietf.org>, "draft-jia-flex-ip-address-structure@ietf.org" <draft-jia-flex-ip-address-structure@ietf.org>,  "draft-jia-scenarios-flexible-address-structure@ietf.org" <draft-jia-scenarios-flexible-address-structure@ietf.org>,  "sarikaya2012@gmail.com" <sarikaya2012@gmail.com>, Lin Han <lin.han@futurewei.com>
To: Jiayihao <jiayihao@huawei.com>
References: <727cfc33b0cb41acaeacc21a33c39d4d@huawei.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/flexip/KmJhTyl0Pa0EvhCwtjv4wlxRtSs>
Subject: Re: [Flexip] The small address use case in FlexIP
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> On 5 Feb 2021, at 12:06, Jiayihao <jiayihao@huawei.com> wrote:
>=20
> =20
> - The header format could be described either in separate draft or be =
included in previous draft. The reason we have not provide a header =
format yet is that the address format itself is already a complex topic, =
so it's better for us to discuss the address first (as well as the =
problems and gaps), thus we can have a better understanding if a =
flexible address structure is a promising way to go.

Again I disagree, you cannot entirely divorce the discussions.

The problem has to be solved as a whole and decisions about the packet =
effect decisions about the address structure. For example if the new =
packet is much larger than IPv6  the case for short addresses becomes =
even weaker.

If I look at the address design that you have proposed this is dominated =
by the short address constraints. If short addresses (in the physical =
sense rather than a logical sense where they are the suffix of a larger =
address) turn out to be a trivial efficiency saving, then we would =
almost certainly use another address design.

For example <len><family><address> as used in ISO 8474 is an extremely =
extensible format at a cost of a two byte overhead, and would allow the =
address designers to proceed independently from the packet designers and =
develop new address types during the deployment lifetime of the =
protocol. This is unlike the approach in the drafts we are discussing =
where a lot of discussions are proposed up front and where the =
development of the address architecture is significantly constrained.

Best regards

Stewart




--Apple-Mail=_B369B634-95A0-4FC1-B228-EA86842A1CFE
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On 5 Feb 2021, at 12:06, Jiayihao &lt;<a =
href=3D"mailto:jiayihao@huawei.com" class=3D"">jiayihao@huawei.com</a>&gt;=
 wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; text-align: justify; font-size: 14px; =
font-family: Calibri, sans-serif; caret-color: rgb(0, 0, 0); font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 14px; font-family: Calibri, =
sans-serif; caret-color: rgb(0, 0, 0); font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""><span lang=3D"EN-US" class=3D"">- The header format =
could be described either in separate draft or be included in previous =
draft. The reason we have not provide a header format yet is that the =
address format itself is already a complex topic, so it's better for us =
to discuss the address first (as well as the problems and gaps), thus we =
can have a better understanding if a flexible address structure is a =
promising way to go.</span></div></div></blockquote></div><br =
class=3D""><div class=3D"">Again I disagree, you cannot entirely divorce =
the discussions.</div><div class=3D""><br class=3D""></div><div =
class=3D"">The problem has to be solved as a whole and decisions about =
the packet effect decisions about the address structure. For example if =
the new packet is much larger than IPv6 &nbsp;the case for short =
addresses becomes even weaker.</div><div class=3D""><br =
class=3D""></div><div class=3D"">If I look at the address design that =
you have proposed this is dominated by the short address constraints. If =
short addresses (in the physical sense rather than a logical sense where =
they are the suffix of a larger address) turn out to be a trivial =
efficiency saving, then we would almost certainly use another address =
design.</div><div class=3D""><br class=3D""></div><div class=3D"">For =
example &lt;len&gt;&lt;family&gt;&lt;address&gt; as used in ISO 8474 is =
an extremely extensible format at a cost of a two byte overhead, and =
would allow the address designers to proceed independently from the =
packet designers and develop new address types during the deployment =
lifetime of the protocol. This is unlike the approach in the drafts we =
are discussing where a lot of discussions are proposed up front and =
where the development of the address architecture is significantly =
constrained.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Best regards</div><div class=3D""><br class=3D""></div><div =
class=3D"">Stewart</div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div></body></html>=

--Apple-Mail=_B369B634-95A0-4FC1-B228-EA86842A1CFE--


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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Fri, 5 Feb 2021 14:58:42 +0000
In-Reply-To: <727cfc33b0cb41acaeacc21a33c39d4d@huawei.com>
Cc: Stewart Bryant <stewart.bryant@gmail.com>, int-area <int-area@ietf.org>, "flexip@ietf.org" <flexip@ietf.org>, "draft-jia-flex-ip-address-structure@ietf.org" <draft-jia-flex-ip-address-structure@ietf.org>,  "draft-jia-scenarios-flexible-address-structure@ietf.org" <draft-jia-scenarios-flexible-address-structure@ietf.org>,  "sarikaya2012@gmail.com" <sarikaya2012@gmail.com>, Lin Han <lin.han@futurewei.com>
To: Jiayihao <jiayihao@huawei.com>
References: <727cfc33b0cb41acaeacc21a33c39d4d@huawei.com>
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Subject: Re: [Flexip] The small address use case in FlexIP
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> On 5 Feb 2021, at 12:06, Jiayihao <jiayihao@huawei.com> wrote:
>=20
> - Indeed, the network scale of limited domain is supposed to be less =
that IPv6, but it doesn't mean the address space should be strictly less =
than 128-bit. If the space of the address is abundant enough, the public =
key could be embedded without truncation (compare to CGA in IPv6) for =
certain security purpose.

Interesting, what are the advantages in adding the signature of the =
address in the address as opposed to carrying it in a different field?

The disadvantage is that you bind the address to the signature algorithm =
which you would not want to do since you would expect to change the =
signature algorithm during the lifetime of the protocol.

Also would you really want to feed the signature into the longest match =
engine? Of course you could and there are some advantages in that you =
look up both the address and it signature, but I think you loose longest =
match capability and you significantly increase the size of the TCAM or =
other FIB design memory, and that memory is very expensive as it =
determines the line rate of the forwarder.

So this points back to the need for a holistic discussion of what we are =
trying to achieve, the extent to which modifying existing protocols =
satisfies that need, and whether (given the presupposed need for a =
gateway) we should be looking for a single protocol, a family of =
protocols, or an adaptable protocol.

I don=E2=80=99t think we can design the addressing system in the absence =
of a discussion on those points.

Best regards

Stewart



--Apple-Mail=_B40EF36E-B1A2-4BCE-81B0-5DC71B9798C0
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On 5 Feb 2021, at 12:06, Jiayihao &lt;<a =
href=3D"mailto:jiayihao@huawei.com" class=3D"">jiayihao@huawei.com</a>&gt;=
 wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><span=
 style=3D"caret-color: rgb(0, 0, 0); font-family: Calibri, sans-serif; =
font-size: 14px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: justify; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none; float: none; display: inline !important;" class=3D"">- Indeed, the =
network scale of limited domain is supposed to be less that IPv6, but it =
doesn't mean the address space should be strictly less than 128-bit. If =
the space of the address is abundant enough, the public key could be =
embedded without truncation (compare to CGA in IPv6) for certain =
security purpose.</span></div></blockquote></div><br class=3D""><div =
class=3D"">Interesting, what are the advantages in adding the signature =
of the address in the address as opposed to carrying it in a different =
field?</div><div class=3D""><br class=3D""></div><div class=3D"">The =
disadvantage is that you bind the address to the signature algorithm =
which you would not want to do since you would expect to change the =
signature algorithm during the lifetime of the protocol.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Also would you really =
want to feed the signature into the longest match engine? Of course you =
could and there are some advantages in that you look up both the address =
and it signature, but I think you loose longest match capability and you =
significantly increase the size of the TCAM or other FIB design memory, =
and that memory is very expensive as it determines the line rate of the =
forwarder.</div><div class=3D""><br class=3D""></div><div class=3D"">So =
this points back to the need for a holistic discussion of what we are =
trying to achieve, the extent to which modifying existing protocols =
satisfies that need, and whether (given the presupposed need for a =
gateway) we should be looking for a single protocol, a family of =
protocols, or an adaptable protocol.</div><div class=3D""><br =
class=3D""></div><div class=3D"">I don=E2=80=99t think we can design the =
addressing system in the absence of a discussion on those =
points.</div><div class=3D""><br class=3D""></div><div class=3D"">Best =
regards</div><div class=3D""><br class=3D""></div><div =
class=3D"">Stewart</div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div></body></html>=

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From nobody Fri Feb  5 10:25:00 2021
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From: Stewart Bryant <stewart.bryant@gmail.com>
Message-Id: <8EFF0C7E-32B2-4C30-B27A-6C165BA7A30B@gmail.com>
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Date: Fri, 5 Feb 2021 18:24:52 +0000
In-Reply-To: <854102e6d17441fcabb16748245b18af@huawei.com>
Cc: Stewart Bryant <stewart.bryant@gmail.com>, Jiayihao <jiayihao@huawei.com>,  Lin Han <lin.han@futurewei.com>, "draft-jia-flex-ip-address-structure@ietf.org" <draft-jia-flex-ip-address-structure@ietf.org>,  int-area <int-area@ietf.org>, "flexip@ietf.org" <flexip@ietf.org>, "sarikaya2012@gmail.com" <sarikaya2012@gmail.com>, "draft-jia-scenarios-flexible-address-structure@ietf.org" <draft-jia-scenarios-flexible-address-structure@ietf.org>
To: Dirk Trossen <dirk.trossen@huawei.com>
References: <727cfc33b0cb41acaeacc21a33c39d4d@huawei.com> <B697AF2A-8B98-4CB8-ACDC-688058276F43@gmail.com> <854102e6d17441fcabb16748245b18af@huawei.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/flexip/OsPUB3p-StQ2IWeFbZiutr4mu28>
Subject: Re: [Flexip] [Int-area] The small address use case in FlexIP
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Dear Dirk

There may be some material that you can use from

https://tools.ietf.org/html/draft-bryant-arch-fwd-layer-uc-01
And=20
https://datatracker.ietf.org/doc/draft-bryant-arch-fwd-layer-ps/

- Stewart

> On 5 Feb 2021, at 15:12, Dirk Trossen <dirk.trossen@huawei.com> wrote:
>=20
> Stewart, all,
> =20
> As Yihao pointed out, we are working on an update to the draft to =
focus the discussion on the communication scenarios and problems arising =
in those scenarios. In that sense, we agree with your desire for a =
holistic discussion and see this upcoming update as one of the next =
towards that.
> =20
> With that in mind, I suggest that we continue the discussions after =
this upcoming update since it is not the intention at this stage to =
propose any solutions or constrain any thinking about solutions but to =
agree that problems may exist that will need to be addressed.
> =20
> Best regards,
> =20
> Dirk
> =20
> From: Int-area [mailto:int-area-bounces@ietf.org] On Behalf Of Stewart =
Bryant
> Sent: 05 February 2021 15:59
> To: Jiayihao <jiayihao@huawei.com>
> Cc: Lin Han <lin.han@futurewei.com>; =
draft-jia-flex-ip-address-structure@ietf.org; int-area =
<int-area@ietf.org>; flexip@ietf.org; sarikaya2012@gmail.com; =
draft-jia-scenarios-flexible-address-structure@ietf.org
> Subject: Re: [Int-area] The small address use case in FlexIP
> =20
> =20
>=20
>=20
> On 5 Feb 2021, at 12:06, Jiayihao <jiayihao@huawei.com =
<mailto:jiayihao@huawei.com>> wrote:
> =20
> - Indeed, the network scale of limited domain is supposed to be less =
that IPv6, but it doesn't mean the address space should be strictly less =
than 128-bit. If the space of the address is abundant enough, the public =
key could be embedded without truncation (compare to CGA in IPv6) for =
certain security purpose.
> =20
> Interesting, what are the advantages in adding the signature of the =
address in the address as opposed to carrying it in a different field?
> =20
> The disadvantage is that you bind the address to the signature =
algorithm which you would not want to do since you would expect to =
change the signature algorithm during the lifetime of the protocol.
> =20
> Also would you really want to feed the signature into the longest =
match engine? Of course you could and there are some advantages in that =
you look up both the address and it signature, but I think you loose =
longest match capability and you significantly increase the size of the =
TCAM or other FIB design memory, and that memory is very expensive as it =
determines the line rate of the forwarder.
> =20
> So this points back to the need for a holistic discussion of what we =
are trying to achieve, the extent to which modifying existing protocols =
satisfies that need, and whether (given the presupposed need for a =
gateway) we should be looking for a single protocol, a family of =
protocols, or an adaptable protocol.
> =20
> I don=E2=80=99t think we can design the addressing system in the =
absence of a discussion on those points.
> =20
> Best regards
> =20
> Stewart
> =20
> =20


--Apple-Mail=_E87FE328-9084-4838-8BE2-F75252ED1E5B
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	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Dear =
Dirk<div class=3D""><br class=3D""></div><div class=3D"">There may be =
some material that you can use from</div><div class=3D""><br =
class=3D""><div class=3D""><a =
href=3D"https://tools.ietf.org/html/draft-bryant-arch-fwd-layer-uc-01" =
class=3D"">https://tools.ietf.org/html/draft-bryant-arch-fwd-layer-uc-01</=
a></div><div class=3D"">And&nbsp;<br class=3D""><div><a =
href=3D"https://datatracker.ietf.org/doc/draft-bryant-arch-fwd-layer-ps/" =
class=3D"">https://datatracker.ietf.org/doc/draft-bryant-arch-fwd-layer-ps=
/</a></div><div><br class=3D""></div><div>- Stewart</div><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">On 5 Feb =
2021, at 15:12, Dirk Trossen &lt;<a =
href=3D"mailto:dirk.trossen@huawei.com" =
class=3D"">dirk.trossen@huawei.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D"">

<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8" =
class=3D"">
<meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)" =
class=3D"">
<style class=3D""><!--
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<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple" class=3D"">
<div class=3D"WordSection1"><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color=
:#1F497D" class=3D"">Stewart, all,<o:p class=3D""></o:p></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color=
:#1F497D" class=3D""><o:p class=3D"">&nbsp;</o:p></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color=
:#1F497D" class=3D"">As Yihao pointed out, we are working on an update =
to the draft to focus the discussion on the communication scenarios and =
problems arising in those scenarios.
 In that sense, we agree with your desire for a holistic discussion and =
see this upcoming update as one of the next towards that.
<o:p class=3D""></o:p></span></p><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color=
:#1F497D" class=3D""><o:p class=3D"">&nbsp;</o:p></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color=
:#1F497D" class=3D"">With that in mind, I suggest that we continue the =
discussions after this upcoming update since it is not the intention at =
this stage to propose any solutions
 or constrain any thinking about solutions but to agree that problems =
may exist that will need to be addressed.
<o:p class=3D""></o:p></span></p><p class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color=
:#1F497D" class=3D""><o:p class=3D"">&nbsp;</o:p></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color=
:#1F497D" class=3D"">Best regards,<o:p class=3D""></o:p></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color=
:#1F497D" class=3D""><o:p class=3D"">&nbsp;</o:p></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color=
:#1F497D" class=3D"">Dirk<o:p class=3D""></o:p></span></p><p =
class=3D"MsoNormal"><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color=
:#1F497D" class=3D""><o:p class=3D"">&nbsp;</o:p></span></p>
<div class=3D"">
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt =
0cm 0cm 0cm" class=3D""><p class=3D"MsoNormal"><b class=3D""><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif" =
class=3D"">From:</span></b><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif" =
class=3D""> Int-area [<a href=3D"mailto:int-area-bounces@ietf.org" =
class=3D"">mailto:int-area-bounces@ietf.org</a>]
<b class=3D"">On Behalf Of </b>Stewart Bryant<br class=3D"">
<b class=3D"">Sent:</b> 05 February 2021 15:59<br class=3D"">
<b class=3D"">To:</b> Jiayihao &lt;<a href=3D"mailto:jiayihao@huawei.com" =
class=3D"">jiayihao@huawei.com</a>&gt;<br class=3D"">
<b class=3D"">Cc:</b> Lin Han &lt;<a href=3D"mailto:lin.han@futurewei.com"=
 class=3D"">lin.han@futurewei.com</a>&gt;; <a =
href=3D"mailto:draft-jia-flex-ip-address-structure@ietf.org" =
class=3D"">draft-jia-flex-ip-address-structure@ietf.org</a>; int-area =
&lt;<a href=3D"mailto:int-area@ietf.org" =
class=3D"">int-area@ietf.org</a>&gt;; <a href=3D"mailto:flexip@ietf.org" =
class=3D"">flexip@ietf.org</a>; <a href=3D"mailto:sarikaya2012@gmail.com" =
class=3D"">sarikaya2012@gmail.com</a>; <a =
href=3D"mailto:draft-jia-scenarios-flexible-address-structure@ietf.org" =
class=3D"">draft-jia-scenarios-flexible-address-structure@ietf.org</a><br =
class=3D"">
<b class=3D"">Subject:</b> Re: [Int-area] The small address use case in =
FlexIP<o:p class=3D""></o:p></span></p>
</div>
</div><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p><p =
class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
<div class=3D""><p class=3D"MsoNormal"><br class=3D"">
<br class=3D"">
<o:p class=3D""></o:p></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt" class=3D"">
<div class=3D""><p class=3D"MsoNormal">On 5 Feb 2021, at 12:06, Jiayihao =
&lt;<a href=3D"mailto:jiayihao@huawei.com" =
class=3D"">jiayihao@huawei.com</a>&gt; wrote:<o:p class=3D""></o:p></p>
</div><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
<div class=3D""><p class=3D"MsoNormal"><span =
style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,sans-serif" =
class=3D"">- Indeed, the network scale of limited domain is supposed to =
be less that IPv6, but it doesn't mean the address space should be =
strictly less than 128-bit. If the space of
 the address is abundant enough, the public key could be embedded =
without truncation (compare to CGA in IPv6) for certain security =
purpose.</span><o:p class=3D""></o:p></p>
</div>
</blockquote>
</div><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
<div class=3D""><p class=3D"MsoNormal">Interesting, what are the =
advantages in adding the signature of the address in the address as =
opposed to carrying it in a different field?<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">The disadvantage is that you bind =
the address to the signature algorithm which you would not want to do =
since you would expect to change the signature algorithm during the =
lifetime of the protocol.<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Also would you really want to =
feed the signature into the longest match engine? Of course you could =
and there are some advantages in that you look up both the address and =
it signature, but I think you loose longest match capability and
 you significantly increase the size of the TCAM or other FIB design =
memory, and that memory is very expensive as it determines the line rate =
of the forwarder.<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">So this points back to the need =
for a holistic discussion of what we are trying to achieve, the extent =
to which modifying existing protocols satisfies that need, and whether =
(given the presupposed need for a gateway) we should be looking
 for a single protocol, a family of protocols, or an adaptable =
protocol.<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">I don=E2=80=99t think we can =
design the addressing system in the absence of a discussion on those =
points.<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Best regards<o:p =
class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal">Stewart<o:p class=3D""></o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
<div class=3D""><p class=3D"MsoNormal"><o:p class=3D"">&nbsp;</o:p></p>
</div>
</div>
</div>

</div></blockquote></div><br class=3D""></div></div></body></html>=

--Apple-Mail=_E87FE328-9084-4838-8BE2-F75252ED1E5B--


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From: Dirk Trossen <dirk.trossen@huawei.com>
To: Stewart Bryant <stewart.bryant@gmail.com>, Jiayihao <jiayihao@huawei.com>
CC: Lin Han <lin.han@futurewei.com>, "draft-jia-flex-ip-address-structure@ietf.org" <draft-jia-flex-ip-address-structure@ietf.org>, int-area <int-area@ietf.org>,  "flexip@ietf.org" <flexip@ietf.org>, "sarikaya2012@gmail.com" <sarikaya2012@gmail.com>, "draft-jia-scenarios-flexible-address-structure@ietf.org" <draft-jia-scenarios-flexible-address-structure@ietf.org>
Thread-Topic: [Int-area] The small address use case in FlexIP
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Date: Fri, 5 Feb 2021 15:12:11 +0000
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Subject: Re: [Flexip] [Int-area] The small address use case in FlexIP
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From nobody Sun Feb  7 14:28:13 2021
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To: flexip@ietf.org
From: Robert Moskowitz <rgm@labs.htt-consult.com>
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Date: Sun, 7 Feb 2021 17:28:00 -0500
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Subject: [Flexip] Admin items
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To all members of the Flexip interest group list:

I just realized today the *I* am the admin for this list that I had set 
up back in 11/18 when I was under contract with Huawei, working on 
Flexip.  The resent posts are the first since 8/19.

I have released one message waiting for admin action.

jiayihao@huawei.com, I have an admin email about and email you sent 2/5 
7am ET, but I do not see it in the admin queue, please resend it.

More importantly, I am not working on Flexip these days.  Nor do I have 
the cycles to attend to it, as Unmanned (and Manned) aircraft comm is 
taking up more time than I have.

So....

I am asking someone currently having a vested interest in Flexip to 
contact me, and I will work with IETF to hand off admin functions to you.

Thank you.

Robert Moskowitz


From nobody Mon Feb  8 19:39:22 2021
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From: Jiayihao <jiayihao@huawei.com>
To: Stewart Bryant <stewart.bryant@gmail.com>
CC: int-area <int-area@ietf.org>, "draft-jia-flex-ip-address-structure@ietf.org" <draft-jia-flex-ip-address-structure@ietf.org>, "draft-jia-scenarios-flexible-address-structure@ietf.org" <draft-jia-scenarios-flexible-address-structure@ietf.org>, "flexip@ietf.org" <flexip@ietf.org>
Thread-Topic: The small address use case in FlexIP
Thread-Index: Adb+lRq8bhXAB77uTtacQg0udOtOUw==
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Subject: Re: [Flexip] The small address use case in FlexIP
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--_000_68749199f08b4d288dce213047ed2611huaweicom_--


From nobody Mon Feb  8 22:40:59 2021
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Hello

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--_000_6F4E6B0C717D4641A2B79BC1740D8CF4A8FB73ABDGGEMM533MBXchi_--


From nobody Mon Feb  8 22:57:19 2021
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From: Dangjuanna <dangjuanna@huawei.com>
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--_000_11123df3a793410c8b2dd3f8ef45d5a1huaweicom_
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mailtest

--_000_11123df3a793410c8b2dd3f8ef45d5a1huaweicom_
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<html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr=
osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
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@page WordSection1
	{size:612.0pt 792.0pt;
	margin:72.0pt 90.0pt 72.0pt 90.0pt;}
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--></style><!--[if gte mso 9]><xml>
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</div>
</body>
</html>

--_000_11123df3a793410c8b2dd3f8ef45d5a1huaweicom_--


From nobody Tue Feb  9 00:00:27 2021
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From: Jiayihao <jiayihao@huawei.com>
To: "flexip@ietf.org" <flexip@ietf.org>
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--_000_82be6eeb4e524db4a5520a431427e4e5huaweicom_
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test


--_000_82be6eeb4e524db4a5520a431427e4e5huaweicom_
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<html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr=
osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
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From: Dirk Trossen <dirk.trossen@huawei.com>
To: Stewart Bryant <stewart.bryant@gmail.com>, Jiayihao <jiayihao@huawei.com>
CC: Lin Han <lin.han@futurewei.com>, "draft-jia-flex-ip-address-structure@ietf.org" <draft-jia-flex-ip-address-structure@ietf.org>, int-area <int-area@ietf.org>,  "flexip@ietf.org" <flexip@ietf.org>, "sarikaya2012@gmail.com" <sarikaya2012@gmail.com>, "draft-jia-scenarios-flexible-address-structure@ietf.org" <draft-jia-scenarios-flexible-address-structure@ietf.org>
Thread-Topic: [Int-area] The small address use case in FlexIP
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Date: Tue, 23 Feb 2021 08:56:28 +0000
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Subject: Re: [Flexip] [Int-area] The small address use case in FlexIP
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