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Date:	Fri, 9 Jul 2010 15:18:14 +0800
From:	Herbert Xu <>
To:	"Michael S. Tsirkin" <>
Cc:	Patrick McHardy <>,
	"David S. Miller" <>,
	Alexey Kuznetsov <>,
	"Pekka Savola (ipv6)" <>,
	James Morris <>,
	Hideaki YOSHIFUJI <>,,,,,,
Subject: Re: [PATCH] netfilter: add CHECKSUM target

On Fri, Jul 09, 2010 at 01:29:13AM +0300, Michael S. Tsirkin wrote:
> 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
> an IP 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
> Typical expected use (helps old dhclient binary running in a VM):
> iptables -A POSTROUTING -t mangle -p udp --dport 68 -j CHECKSUM
> --checksum-fill
> Signed-off-by: Michael S. Tsirkin <>

I'd think that this target would be protocol-agnostic, no?

Email: Herbert Xu <>
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