Re: [Users] Nat-t, winxp, certs and PSK ---> getting OT.

From: Philipp Snizek <psnizek(at)seaan.net>
Date: Sun Feb 29 2004 - 16:03:14 EST

 

> > Log on Gateway if trying there is NAT inbetween:

It indeed is a communication problem. I'm going out via wireless adapter. Windows XP seems to be hardcoded to MTU size 1314 Bytes and thus is fragmenting everything that is larger than those 1314bytes. Well, one of the isakmp packets is 1318bytes long. Probably the one the cert is sent.
To prove it's the wireless adapter I hung my notebook via wire to my access point. See there it worked! SA established!

I really do hope the windows programmers did not hardcode this lousy mtu size of 1314bytes. At least whatever MTU size I changed with DrTCP absolutely nothing changed on the Windows XP behaviour. MTU for this wireless adapter stayed at 1314 bytes. Could it also be a bad adapter driver?

If anybody in this list has the same experience and could solve it, please let me know. My wireless adapter is a D-Link 650+.

TIA
Philipp

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https://mj2.freeswan.org/cgi-bin/mj_wwwusr Received on Sun Feb 29 16:08:07 2004