Hi Pim, > On 31. Mar 2024, at 11:04, Pim van Pelt <[email protected]> wrote: > > Hoi Ondrej, Nico, Sebastian, > > I am revisiting this thread based on the question from Benoit this week > (https://www.mail-archive.com/[email protected]/msg07961.html). > > On Tue, Jan 30, 2024 at 12:20:41PM +0100, Sebastian Hahn wrote: > > > On 30. Jan 2024, at 10:32, Nico Schottelius via Bird-users > > > <[email protected]> wrote: > > > Is there a way to purely go IPv6 only and still relay stub network IPv4 > > > information via an IPv6 only internal area? > > > > I was facing the same issue before, and unfortunately, RFC 5838 > > explicitly forbids IPv4 over IPv6 for OSPF. > Sebastian - my interpretation of 5838 is slightly different, and I don't > think it expressly forbids xAF nexthops: > > 2.5: Although IPv6 link local addresses could be used as next hops for IPv4 > > address families, it is desirable to have IPv4 next-hop addresses.
My understanding came from this: > In order to achieve this, the link's IPv4 address will be advertised > in the "link local address" field of the IPv4 instance's Link-LSA. > This address is placed in the first 32 bits of the "link local > address" field and is used for IPv4 next-hop calculations. The > remaining bits MUST be set to zero. which to me reads like the statement about desirability just explains why the technical design doesn't allow IPv6 next hops. I would be happy to be wrong here. Thanks Sebastian
