From: Patrick McHardy <kaber@trash.net>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: "Daniel P. Berrange" <berrange@redhat.com>,
Jes Sorensen <Jes.Sorensen@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
Jan Engelhardt <jengelh@medozas.de>,
Randy Dunlap <randy.dunlap@oracle.com>,
netfilter-devel@vger.kernel.org, netfilter@vger.kernel.org,
coreteam@netfilter.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org
Subject: Re: [PATCHv4] netfilter: add CHECKSUM target
Date: Thu, 15 Jul 2010 17:22:10 +0200 [thread overview]
Message-ID: <4C3F27A2.3030207@trash.net> (raw)
In-Reply-To: <20100715115217.GA6737@redhat.com>
Am 15.07.2010 13:52, schrieb Michael S. Tsirkin:
> This adds a `CHECKSUM' target, which can be used in the iptables mangle
> table.
>
> You can use this target to compute and fill in the checksum in
> a packet that lacks a checksum. This is particularly useful,
> if you need to work around old applications such as dhcp clients,
> that do not work well with checksum offloads, but don't want to
> disable checksum offload in your device.
>
> The problem happens in the field with virtualized applications.
> For reference, see Red Hat bz 605555, as well as
> http://www.spinics.net/lists/kvm/msg37660.html
>
> Typical expected use (helps old dhclient binary running in a VM):
> iptables -A POSTROUTING -t mangle -p udp --dport bootpc \
> -j CHECKSUM --checksum-fill
>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> Includes fixes by Jan Engelhardt <jengelh@medozas.de>
Applied, thanks Michael.
next prev parent reply other threads:[~2010-07-15 15:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-15 11:52 [PATCHv4] netfilter: add CHECKSUM target Michael S. Tsirkin
2010-07-15 15:22 ` Patrick McHardy [this message]
2010-07-15 17:42 ` Michael S. Tsirkin
2010-07-16 12:09 ` Patrick McHardy
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