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
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