Firewall-1

[FW-1] Smart Defense "Small PMTU" attack

Subject: [FW-1] Smart Defense "Small PMTU" attack
From: Misha Alikov <alikov AT COMCAST DOT NET>
To: FW-1-MAILINGLIST AT AMADEUS.US.CHECKPOINT DOT COM
Date: Wed, 30 Jul 2003 13:23:33 -0400
I have an NG-FP1 Management Server that controls a mixture of
NG-FP1 and 41-SP6 Enforcement Modules at remote locations.

Just recently, a user behind one of my 41-SP6 Enforcement Modules
attempted to access (HTTP) a Web Server behind an NG-FP3 Firewall
within a separate organization, and was stopped by their Smart Defense
system - reason given was "Small PMTU" attack.

This sounds like a "false positive" to me, but I'm curious to know if
anyone else has encountered this issue, and/or what anyone might suggest
I do as a workaround.

ps. I should mention that I have ":ipsec_dont_fragment (false)" set in
    my NG-FP1 Management Server's $FWDIR/conf/objects_5_0.C file for
    each of my remote Enforcement Modules.

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