[ih] Source routing

[Dave Taht]

we put "source specific routing" into the babel protocol in 2012 (and also isis)
https://www.rfc-editor.org/rfc/rfc9079.html

OpenWrt adopted it (statically) to basically handle the bcp38 problem
for IPv6 elegantly, and also uses it to route correctly to multiple
upstreams.

On Sun, Feb 2, 2025 at 11:27 AM Andrew G. Malis via Internet-history
<internet-history at elists.isoc.org> wrote:
>
> Dave,
>
> Source routing is very much back in favor, mainly for traffic engineering
> but for other applications as well. Check out the work in the IETF's SPRING
> WG, https://datatracker.ietf.org/wg/spring/about/ , which defines source
> routing for IPv4 via MPLS and natively in IPv6.
>
> Cheers,
> Andy
>
>
> On Sun, Feb 2, 2025 at 1:37 PM Dave Crocker via Internet-history <
> internet-history at elists.isoc.org> wrote:
>
> > My recollection is that mechanisms for source routing were common in the
> > early days, but lost favor.
> >
> > UUCP networking (!) was a version.  SMTP originally supported it.  I
> > don't think Arpanet packets did, though I have a vague sense there was
> > some selectivity allowed.  And I don't think IP did.
> >
> > I'm curious about a rough summary of when and how it was used and when
> > and why it lost favor.
> >
> > d/
> >
> > --
> > Dave Crocker
> >
> > Brandenburg InternetWorking
> > bbiw.net
> > bluesky: @dcrocker.bsky.social
> > mast: @dcrocker at mastodon.social
> >
> > --
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> >
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-- 
Dave Täht CSO, LibreQos