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Re: [spring] 6MAN WGLC: draft-ietf-6man-sids

Robert Raszuk <robert@raszuk.net> Sat, 08 October 2022 07:15 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Sat, 08 Oct 2022 09:16:21 +0200
Message-ID: <CAOj+MMEx7+jWN1yC=81dMwo5GmqbhyHqOZr9W2_qzN9BNjs+Zw@mail.gmail.com>
To: Suresh Krishnan <suresh.krishnan@gmail.com>
Cc: Joel Halpern <jmh@joelhalpern.com>, 6man <ipv6@ietf.org>, SPRING WG List <spring@ietf.org>
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Subject: Re: [spring] 6MAN WGLC: draft-ietf-6man-sids
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Hi Suresh,

NEW:
> In case the deployments do not use this allocated prefix additional care
> needs to be exercised at network ingress and egress points so that SRv6
> packets do not leak out of SR domains and they do not accidentally enter SR
> unaware domains.
>

IMO this is too broad. I would say that such ingress filtering could/should
happen only if dst or locator is within locally  configured/allocated
prefixes. Otherwise it is pure IPv6 transit and I see no harm not to allow
it.


> Similarly as stated in Section 5.1 of RFC8754 packets entering an SR
> domain from the outside need to be configured to filter out the selected
> prefix if it is different from the prefix allocated here.
>

Again the way I read it this kills pure IPv6 transit for SRv6 packets. Why
?

(Well I know the answer to "why" from our endless discussions about SRv6
itself and network programming however I still see no need to mandate in
any spec to treat SRv6 packets as unwanted/forbidden for pure IPv6 transit.)

Thx,
R.

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