On Tuesday 19 February 2008, Marshall Eubanks wrote:
On Feb 19, 2008, at 3:39 PM, Brian E Carpenter wrote:
On 2008-02-20 08:34, Marshall Eubanks wrote:
...
Not AFAICT in IPv6 :
rfc2460 :
o Unlike IPv4, when UDP packets are originated by an IPv6
node,
the UDP checksum is not optional. That is, whenever
originating a UDP packet, an IPv6 node must compute a UDP
checksum over the packet and the pseudo-header, and, if
that
computation yields a result of zero, it must be changed
to hex
FFFF for placement in the UDP header. IPv6 receivers must
discard UDP packets containing a zero checksum, and
should log
the error.
Of course, this decision was taken in parallel with the decision to
drop
the IP header checksum from IPv6. Nobody was quite ready to 100% trust
the link layer.
And the discussion about dropping this in IPv6 is in the context of
tunnel encapsulations where the
interior packet has a checksum.
But "what is" the interior packet if the udp header is mangled and the ports
were changed? AFAICT at least the header checksum is required when using
IPv6.
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