Subject: [midcom] Semantics #4: Return values in PER

From: Martin Stiemerling <[email-masked]>
Date: Wed, 20 Nov 2002 01:07:43 +0100

What to return in PER transaction reply if inside and/or outside 
address/port are not allocated?
Examples: middlebox is packet filter (no inside or outside address/port) 
or traditional NAT (only outside address/port).

First choice: Return emtpy/none marker. This has the impact that the 
middlebox type is no longer transparent to the agent, i.e. the agent has 
to care what type of middlebox it is using

Second choice: Return external and/or internal endpoint addresses/port 
if appropriate.

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