Subject: Re: DHCP client

From: Cody Smith <[email-masked]>
Date: Thu, 24 Feb 2000 20:44:12 -0800 (PST)

Mr.Schneider is exactly right in what he said, but
there is more.  If a DHCP client is leased an IP
address for a certain time period that client will
keep the DHCP configuration information in its
registry.  If upon startup the DHCP client does not
recieve a reply to its DHCPrequest message which is
sent out everytime the computer is restarted, it will
still hold the original lease in its registry.  When
50% of the lease time expires the DHCP client will
request a DHCP lease renewal directly from the
originating DHCP server.  When it cant find a DCHP
server it will keep on sending out DHCPrequest
messages directly to the server from where the lease
was first obtained, in certain specified intervals
which are as follows:
4 DHCPrequest messages in the first 5 minutes of
startup, and 1 DHCPrequest message every 5 minutes
thereafter.
When the 87.5% of the clients lease has expired, and
the DHCP client still cannot find the originating DHCP
server is will send out a DHCPdiscover message which
will basically broadcast to every DHCP server on the
subnet if there is more than one DHCP server.  Keep in
mind while all this is happening the client still
holds on to that valid TCP/IP configuration(including
a valid IP address) in the registry.  So basically
your DHCP client computer will have a valid IP address
untill the lease expires, but it will not be able to
participate in a TCP/IP session.

Cody Smith
Network Administrator
US Army
FT. Lewis, WA 98433

=====
The only good is knowledge, and the only evil ignorance.
-Socrates
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