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    SubjectRe: [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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