From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Mark Weaver" <mark@npsl.co.uk>
Subject: RE: icmp: 10.1.4.50 unreachable - need to frag (mtu 500) [tos 0xc0]
Date: Wed, 14 Jan 2004 18:11:18 -0000
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> Do a:
> iptables -V
>
> I'm guessing you are running an older version that is not patched for
> this problem (1.2.6a or prior). Here is the original advisory:
> http://www.linuxsecurity.com/advisories/other_advisory-2063.html
>
That's not enough: you need a patched (or later) kernel as well as the bug
actually existed in the netfilter module.  I can't remember OTOMH which
kernel release this went into, although it was much later than the mentioned
version because the kernel team rejected the original fix (for some good
reasons).  I know 2.4.23+ don't have this problem.