From owner-freebsd-hackers@FreeBSD.ORG  Tue Jan 27 13:52:26 2004
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Date: Tue, 27 Jan 2004 13:52:25 -0800 (PST)
From: Kelly Yancey <kbyanc@posi.net>
To: Kai Mosebach <kai@freshx.de>
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Subject: Re: truncated-ip problem
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On Tue, 27 Jan 2004, Kai Mosebach wrote:

> Dear lists,
>
> lately i installed my netgear wg511 pci, trying to run it as a AP on my
> FreeBSD 5.2-RELEASE using the ath driver.
>
> Now I run into these problems :
>
> dhcp requests are not answered, pings don't work (traffic at all is
> unstable)
>
> a tcpdump results in this :
>
> -bash-2.05b# tcpdump -e -vvv -i ath0
> tcpdump: listening on ath0
> 17:42:45.311390 0:9:5b:84:56:7f Broadcast ip 342: 0.0.0.0.bootpc >
> 255.255.255.255.bootps:  xid:0x1d24ed9c [|bootp] (ttl 128, id 1547, len 328)
> 17:42:45.337508 0:9:5b:84:56:7f Broadcast ip 342: truncated-ip - 18105 bytes
> missing! 0.0.0.0.bootpc > 255.255.255.255.bootps:  xid:0x1d24ed9c [|bootp]
> (ttl 128, id 1547, len 18433, bad cksum 339b!)

  Try adding -S 20000 to your tcpdump command-line.  This wouldn't be cause of
your connectivity problems, but would reduce the noise in your tcpdumps.
Tcpdump cannot calculate the checksums you requested by specifying -vvv unless
it has the entire packet to work with.

  Kelly
--
Kelly Yancey  -  kbyanc@{posi.net,FreeBSD.org}  -  kelly@nttmcl.com