IPv4 next-hops over IPv6

[Nico Schottelius]

Ciao Tore,

if I am not mistaken this is rather easy and "standard":

- Router knows a.b.c.d/x is supposed to be routed via 2001:db::1
- Router can lookup the mac address of 2001:db::1 (usual icmp6)
- Router sends packet for a.b.c.d/x towards mac address of 2001:db::1

That's it.

Cheers,

Nico

p.s.: The first few weeks it feels like magic, the following years that
method feels like AMAZINGLY USEFUL magic ;-)

Tore Anderson <tore at fud.no> writes:

> * Jay Hanke
>> Has anyone implemented lab or production IPv4 next hops over an IPv6
>> only IX vlan with BIRD as the route server?
>>
>> I'm interested to hear your experiences. Specifically router vendor interop.
>
> I haven't, but I cannot begin to fathom how that could possibly work.
>
> How can the receiving router possibly resolve an IPv4 next-hop address
> to an destination Ethernet MAC address, if the interface facing the IX
> does not have any IPv4 addresses assigned?
>
> What would the next-hop IPv4 address be set to, and how is that determined?
>
> Tore
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