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. Brian _______________________________________________ Ietf@xxxxxxxx http://www.ietf.org/mailman/listinfo/ietf