Date: Sun, 7 Jul 2002 11:31:26 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Irwan Hadi <irwanhadi@phxby.engr.usu.edu> Cc: questions@FreeBSD.ORG Subject: Re: pullup failed Message-ID: <20020707103126.GB20900@happy-idiot-talk.infracaninophi> In-Reply-To: <20020707044255.GA3260@phxby.com> References: <20020707044255.GA3260@phxby.com>
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On Sat, Jul 06, 2002 at 10:42:55PM -0600, Irwan Hadi wrote:
> pullup failed
ipfw(8) man page:
FINE POINTS
=B7 There are circumstances where fragmented datagrams are unconditi=
on=AD
ally dropped. TCP packets are dropped if they do not contain at
least 20 bytes of TCP header, UDP packets are dropped if they do n=
ot
contain a full 8 byte UDP header, and ICMP packets are dropped if
they do not contain 4 bytes of ICMP header, enough to specify the
ICMP type, code, and checksum. These packets are simply logged as
``pullup failed'' since there may not be enough good data in the
packet to produce a meaningful log entry.
Fragmented packets like that are probably due to broken hardware on
your network, although they can be the result of enemy action.
Cheers,
Matthew
--=20
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
Savill Way
Tel: +44 1628 476614 Marlow
Fax: +44 0870 0522645 Bucks., SL7 1TH UK
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