Re: [IPv6] New draft: L4 Checksums in SRv6

On Thu, Aug 3, 2023 at 9:30 AM Tony Przygienda <[email protected]> wrote:
>
> well, turns out using a destination address to piggy back some computation semantics and especially changing it in mid-flite is not a great idea. Who knew ...

Tony,

We already have a working example on how to change destination
addresses in flight and deal with L4 checksums: NAT. So compressed
SIDs in Destination address could work if typical NAT processing to
adjust the TCP/UDP checksum is performed each time the Destination
address is written with a different SID. This method would require no
update to RFC8200 nor any changes to deployed IPv6 stacks.

Tom

>
> as to bis'ing STD86 I was quickly thinking "it's not April yet" ...
>
> -- tony
>
>
> On Thu, Aug 3, 2023 at 9:43 AM <[email protected]> wrote:
>>
>> Hi Tal,
>>
>>
>> Please note that there is an existing draft:
>>
>> https://datatracker.ietf.org/doc/draft-xiao-spring-srv6-checksum/
>>
>> which attempts to address the problem you found and another one described in the penultimate paragraph of the Introduction section, in a different way not requiring to update RFC 8200.
>>
>>
>> Best Regards,
>>
>> Xiao Min
>>
>> Original
>> From: TalMizrahi <[email protected]>
>> To: [email protected] <[email protected]>;[email protected] <[email protected]>;
>> Date: 2023年08月03日 15:03
>> Subject: [IPv6] New draft: L4 Checksums in SRv6
>>
>> Hi,
>>
>> This new draft introduces a proposed update to [RFC8200], which is
>> intended to address compressed segment lists in SRv6
>> [draft-ietf-spring-srv6-srh-compression].
>>
>> Link to the new draft:
>> https://datatracker.ietf.org/doc/draft-mizrahi-spring-l4-checksum-srv6/
>>
>> There was some discussion in the SPRING mailing list about this issue.
>>
>> The current thread is intended to allow a wider discussion that
>> includes the 6MAN working group, and therefore the new draft includes
>> a wider background.
>>
>> Feedback will be welcome.
>>
>> Cheers,
>> Tal.
>>
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