Re: I-D Action:draft-rosenberg-internet-waist-hourglass-00.txt]

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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.

>
>    Brian

Marshall

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