Re: is source address binding more valuable for IPv6?
I'm less familiar with Teredo, but there is a 6to4 scenario where an
IPv4-based 6to4 host wants to access a native IPv6 host. In this
scenario, the two hosts must communicate via a 6to4 "relay" that handles
encapsulation/unencapsulation between 6to4 encapsulated IPv6 and native
IPv6. Dependent upon on how "close" routing-wise the 6to4 relay is both
hosts, it is possible for the routes taken between the two hosts to be
very inoptimal and asymmetric.
If both end-points are IPv4 hosts with 6to4 encapsulated IPv6, then yes,
the route taken can be as optimal as the IPv4 route.
Bill Cerveny
On Thu, 20 Aug 2009 12:34 +0200, "Pascal Hambourg"
<pascal.mail@plouf.fr.eu.org> wrote:
> Hello,
>
> Ivan Shmakov a écrit :
> > Do I understand it correctly, that the 6to4 and Teredo tunneling
> > transition mechanisms work by establishing ``implicit'' tunnels,
>
> Yes, you can say that.
>
> > and, thus, are subject to the already existing IPv4 routing,
>
> The tunneling packets are.
>
> > while 6in4 routes the packets via the chosen IPv6 provider?
>
> 6in4 is just the encapsulation method (protocol 41) used by 6to4, and
> one of the encapsulation methods used by some IPv6 tunnel brokers (which
> are what you call "IPv6 providers" I guess).
>
> > Thus, it seems sensible for a single host to always implement
> > Teredo or 6to4, even if as an addition to 6in4, in order to
> > utilize the existing IPv4 routing. (Consider, e. g., two
> > friends with hosts connected to the network of some IPv4
> > provider; the use of 6in4 implies that the traffic will be
> > routed via yet another, possibly distant, IPv6, provider, while
> > with either Teredo or 6to4, the packets will be routed directly
> > via the IPv4 provider's network, resulting in lower latency,
> > bandwidth consumption, etc.)
>
> IPv4 routing between two hosts may not be straightforward either.
>
> > May it therefore make sense for all the IPv6-compatible network
> > software to support source IPv6 binding?
>
> Not more than for a classic multihomed IPv4 host, IMO.
>
>
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