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Date: Fri, 10 Jun 2005 15:24:09 +0800
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Subject: Dropped fragment GRE
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Hi all,

I am currently running ipfw from FreeBSD-5.3-RELEASE on my box. The box =
passes GRE packets from the external to the internal network. We run =
Microsoft RDP over PPTP through the firewall. After upgrading to FreeBSD =
5.3, we realised that the RDP connections never get initiated. When I =
did a tcpdump on the internal and external interfaces of the FW, I =
realised that there were fragmented GRE packets arriving at the FW, but =
however, these packets do not leave the FW. I also observed the SEQ no. =
in the GRE packets ingress/egress, and there were missing GRE packets on =
the egress.

My deduction was that ipfw was dropping these fragmented GRE packets, =
but however, these events were shown on syslog. How do I make ipfw log =
dropped/silently rejected packets? How to I prevent ipfw from dropping =
these packets?

Appreciate all help given,

Thank you.

J.W.