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 From:  Michael Sierchio <kudzu at tenebras dot com>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Windows 2003 domain over VPN MTU issues...
 Date:  Wed, 06 Jun 2007 13:48:10 -0700
Joe Lagreca wrote:
> So everything was working fine for a while, then all of the sudden, I
> started having the same problems last night.  Pings over 1408 would get
> dropped or not make it through.  This morning, it seems to be working
> again.  Very strange.
> However, my VPN between two m0n0walls works fine with any size packets.  
> The
> problem seems to be with my m0n0wall to sonicwall VPN.  Even over that alot
> of stuff will work, its just certain MS stuff that has problems with
> oversized UDP packets.
> Anyone else run into this before or have any ideas?

Check to see if the ICMP needfrag error messages are being blocked,
which would break path MTU discovery.