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Hoi Ondrej,<br>
<br>
<div class="moz-cite-prefix">On 02.04.2024 16:40, Ondrej Zajicek via
Bird-users wrote:<br>
</div>
<blockquote type="cite" cite="mid:ZgwY78tA%2Fdr93g+p@feanor">
<pre>Although one could have option that forces it to interpret as IPv6, i
would prefer to have 'extended next hop' option that allows to accept
both IPv4 and IPv6 next hops in Link-LSA.</pre>
</blockquote>
Did you mean that:<br>
1) under normal circumstances, an ipv4 channel with an ipv6 ospfv3
adjacency, will respect RFC5838 and overload the link-lsa with the
ipv4 address;<br>
2) when `extended next hop` is active on the interface, an ipv4
channel with ipv6 ospfv3 adjacency, will use the ipv6 nexthop in the
link-lsa?<br>
<br>
If so, (2) will make Bird break interoperability with any other
RFC5838 neighbor.<br>
<br>
Is an alternative perhaps, to make Bird choose the message neighbor
as nexthop, and ignore the link-lsa value when `extended next hop`
is set? Or is that gross?<br>
<br>
Example: if neighbor fe80:foo::1234/64 sent the LSA with nexthop as
c0000201.00* (192.0.2.1), AND `extended next hop` is set AND the
interface doesn't have an IPv4 address, only then do we ignore the
link-lsa but use fe80:foo::1234%iface instead. <br>
<br>
Incidentally, if we decide to merge the babel patch I offered, we
can further create analogous behavior by allowing `extended next hop
always` which would use the message neighbor address even if an IPv4
address is present.<br>
<br>
ps - even with IPv4 on the interface and RFC5838 as it was intended,
I still don't see Bird emit the learned routes to the kernel (see my
message to Benoit on 30.03.2024, 15:50); so I think even setting
extended next hop aside, I cannot confirm that OSPFv3 with ipv4
channel works in that configuration.<br>
<br>
groet,<br>
Pim<br>
<pre class="moz-signature" cols="72">--
Pim van Pelt <a class="moz-txt-link-rfc2396E" href="mailto:pim@ipng.ch"><pim@ipng.ch></a>
PBVP1-RIPE <a class="moz-txt-link-freetext" href="https://ipng.ch/">https://ipng.ch/</a></pre>
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