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    SubjectRe: Incremental update of TCP Checksum
    On Tue, 16 Sep 2003 23:28:26 -0400
    "Raf D'Halleweyn" <raf@noduck.net> wrote:

    > This is what I wrote some time ago. But I haven't used it recently.

    See include/net/ip.h:ip_increase_ttl(). Most people get this
    code wrong, in particular the final carry.
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