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Subject: Re: svn commit: r242739 - stable/9/sys/dev/ti
From: Adrian Chadd <adrian@freebsd.org>
To: Andre Oppermann <andre@freebsd.org>
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Cc: pyunyh@gmail.com, FreeBSD Net <freebsd-net@freebsd.org>,
 Pyun YongHyeon <yongari@freebsd.org>
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On 8 November 2012 15:55, Andre Oppermann <andre@freebsd.org> wrote:

> At the risk of repeating myself: when a routed packet is fragmented
> the payload (layer 4, eg. TCP/UDP/SCTP) is NOT recalculated or changed
> or anything else.  It remains as originally calculated by the sender
> unchanged in the first fragment L4 header.  Only the IPv4 header
> checksum, which DOES NOT include any payload data, has to be calculated
> for every fragment.  The IPv4 header checksum is offloaded with CSUM_IP
> and continues to work as expected. :)

NAT and firewalling? :)



Adrian