[Babel-users] IPv4+6 routing in Babel

[Henning Rogge]

Am Sonntag 30 August 2009 22:02:53 schrieb Juliusz Chroboczek:
> > I have a question about Babels ability handling IPv4 and IPv6 traffic at
> > the same time.
> >
> > What is the limit of this ? Do all nodes have to support IPv6 (so that
> > IPv4 traffic can be routed as IPv6 "legacy" IPs) ? Or does it support
> > networks where some nodes only handle IPv4, some handle both IPv4 and
> > IPv6 and some only IPv6 ?
> 
> Babel fully supports hybrid networks.  The only limitation is that all
> nodes need to have kernel support for IPv6 (but they don't need IPv6
> addresses).  This limitation could in principle be lifted, but I don't
> think it's worth it.
>
> Interestingly enough, in the current implementation, an IPv6-only node will
> only forward IPv6, while an IPv4-only node will forward both IPv4 and IPv6
> (but will of course be unable to originate or receive IPv6 packets).
How do IPv4 nodes forward IPv6 traffic ?

According to my knowledge you cannot insert a routing entry into linux with 
IPv6 as destination and IPv4 as gateway (next hop).

Henning Rogge
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