Without this peice of code alternating pure ACK and data packets have
different don't fragment bits. The result is that VJ compression can
never send a compressed TCP header during interactive traffic.
As far as I know this can't cause any trouble for path MTU discovery.
However, putting this piece of code in seems to reveal a bug in VJ
compression, either in our code, or the code on certain Annex systems.
I'm trying to track this down right now.
-- eric
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Eric Schenk www: http://www.cs.toronto.edu/~schenk
Department of Computer Science email: schenk@cs.toronto.edu
University of Toronto