On 30.01.24 10:32, Nico Schottelius via Bird-users wrote:
Good morning,
if we are talking about BGP, IPv4 routing over IPv6 works beautifully. We just add another IPv4 channel and get BGP MP.
OSPFv3 works fine on IPv6 and when creating two instances, one for IPv6 one for IPv4, things look correct. But how does OSFPv3 conceptually work if the interface of the ospf area do not have IPv4 addresses themselves?
In the BGP case we can use "extended next hop on;" to use the IPv6 nexthop for IPv4, but I did not find a similar setting for OSPF to accept IPv6 nexthops for IGP IPv4 addresses.
Is there a way to purely go IPv6 only and still relay stub network IPv4 information via an IPv6 only internal area?
Best regards,
Nico
Hi Nico, If every router has "at least" a /32 IPv4 address on loopback[1], you could do "OSPF unnumbered". It's not IPv4 over IPv6 but you do not need a bunch of IPv4 peer addresses on each and every interface. [1] IIRC I had some issues with that setup a few years ago, _BUT_ you can /just/ assign the /32 IPv4 loopback address on each OSPF interface, too. Otherwise: If you already have and can use BGP MP, why would you want IPv4 in OSPF, too? (Curious questions...) Best, Bernd