In the setup I'm looking now there are IPv4-only and IPv6-only SIP-clients (or UA's)
but the
Proxies (or servers) are v4 and v6 dual-stacked (to make things a bit easier).
I think there will be a lot of IPv6-only SIP-clients (e.g. mobile clients and all the
existing IPv4-NAT'ed
networks) and a lot of IPv4-only "old legacy" SIP-clients. We have to find ways to
deal with such
setups.
There are ways with IPv4/IPv6 NAT-PT but I think this is not the right way (a lot of
DNS-problems).
There seems to be a way with RTP-Proxies (thanks Olle for the link) but even this (if
it works) seems
not the right solution for the problem (it's still a kind of NAT who breaks the
end-to-end idea).
What do you think about a back-to-back-server between the IPv4 and the IPv6 world?
Regards
Armin
-----Urspr�ngliche Nachricht-----
Von: [EMAIL PROTECTED] im Auftrag von Nicolas Bougues
Gesendet: Do 08.01.2004 21:53
An: [EMAIL PROTECTED]
Cc:
Betreff: Re: [Asterisk-Users] IPv6 support
On Thu, Jan 08, 2004 at 11:19:48AM +0100, Olle E. Johansson wrote:
> >
> >There is no real "design issue" with IPV6. No more NAT, that's all.
> Oh, there is a lot of design issues if you consider a dual-IP network.
>
> * If you dial me from an IPv4 network and I'm on IPv6, we have to force
> media proxy
> (Like NAT today)
>
> * If you're on a IPv4 only network, dialling me and get an IPv6 address to
> my SIP proxy
> - what do you do?
> * If you're dialing through a SIp proxy and your SDP is IPv6 and your SIP
> contact is IPv4,
> what do we do?
>
Well, usually right now :
- machines have both v4 and v6 stacks
- machines have both v4 and v6 addresses
In this setup, there wouldn't be any change for v4 stuff. And v6 stuff
is not much more complicated (although there still might be problems,
like, for instance, some VoIP protocol having syntax problems with v6
addresses).
The idea of a v4 client and v6 server (or proxy, or whatever) looks a
little bit odd to me. If such a thing was easy to do, the world would
have embraced ipv6 quite some time ago.
IPv4 machines can only talk to IPv4.
IPv6 maps IPv4 addresses. So a machine with an IPv6 only stack could
theoritically reach a v4 client through some gateway. And I agree,
this would be quite a mess from the voip protocol stand point.
But hopefully, either :
- v6 hosts are fully v4 enabled as well
- v6 only hosts will only talk to v6 peers
--
Nicolas Bougues
Axialys Interactive
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