Bug#254910: marked as done (kernel-2.4.22-2-686 and higher: Incorrect UDP checksum for DNS request with 8139too driver)
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Subject: kernel-2.4.22-2-686 and higher: Incorrect UDP checksum for DNS
request with 8139too driver
From: Klaus-Dieter Mirsch <kdmirsch@gmx.net>
To: Debian Bug Tracking System <submit@bugs.debian.org>
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Date: Thu, 17 Jun 2004 19:52:44 +0200
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Package: kernel-2.4.22-2-686
Severity: important
-- System Information:
Debian Release: testing/unstable
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.6-1-686
Locale: LANG=C, LC_CTYPE=C
Real System Information:
Debian Relase: stable
Architecture i386 (i686)
Kernel: Linux 2.4.26-2-686
The 8139too driver/kernel-module distributed with kernel-2.4.22-2-686
and higher generates an incorrect UDP checksum (information gathered
from ethereal captures) for DNS queries.
In general this is no problem and DNS queries get answered. But it is a
problem when using e.g. Cisco's VPN-Client 404B for Cisco
VPN-3000-Series, tunneling IP to access a secured company LAN. The
vpnclient drops the DNS query. Other protocols (telnet,ftp,ssh,http,
...) work well.
Module is: /lib/modules/2.4.22-2-686/kernel/drivers/net/8139too.o
On kernel-2.4.18-1-686 the UDP checksums for DNS queries are ok.
best regards
-kdm-
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Received: (at 254910-done) by bugs.debian.org; 31 Aug 2004 21:42:42 +0000
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Tue, 31 Aug 2004 23:42:37 +0200
Date: Tue, 31 Aug 2004 23:42:37 +0200
From: Christoph Hellwig <hch@lst.de>
To: Klaus-Dieter Mirsch <kdmirsch@gmx.net>
Cc: 254910-done@bugs.debian.org
Subject: Re: Bug#254910: #254910 kernel-2.4.22-2-686 and higher: Incorrect UDP checksum for DNS request with 8139too driver
Message-ID: <20040831214237.GA14423@lst.de>
References: <[🔎] 20040828162253.GA15347@lst.de> <1093882356.3536.36.camel@localhost>
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> There is a ISDN card(AVM FRITZ!Card PCMCIA 2.0), a modem card (3Com 56K
> 3CCM156B), I have a working (but old) laptop with an Intel Corp.
> 82557/8/9 [Ethernet Pro 100] network adapter. With all these network
> devices the UDP checksums for DNS requests are ok. So for me it sounds
> very very much for the 8139too-driver
See:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=126869
It seems the broken cisco binary driver messes with the packets directly
and breaks with hardware than can do checksum offloading.
"ethtool -K <interface> tx off" appears to be a siple workaround
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