FreeBSD 7.1 IPv6 multihoming problem

[Zöld]

Hi guys! I attached my testbed! It's a small testbed, I don't need to look
onto the internet. The wlan gets an address from 2001:738:2001:2082::/64 The
phone gets an address from 2001:738:2001:20a9::/64 The server in the
2001:738:2001:2081:/64 network.
I would like to make some SCTP failover measurement between the laptop and
SCTP server. I need a solution where the packets go via the proper
interfaces. (ipfw fwd doesn't work)
Static routes don't operate, because the packets always out on the default
gateway.
I work on my thesis and I haven't got too much time. Can you explain an
exact solution?

Regards
Gábor Zöld

2009/4/1 Giuliano Gavazzi <dev+lists at humph.com <dev%2Blists at humph.com>>

> Sorry Julian, I wrongly sent my reply to you!
>
> On T 31 Mar, 2009, at 22:38 , Julian Elischer wrote:
>
>  zgabe wrote:
>>
>>> Hi All, I am using laptop, FreeBSD 7.1 connecting to two ISPs (wlan and
>>> ppp) and I
>>> have IPv6 addresses. 'netstat -rn' says there is only one default gateway
>>> (for example wlan's default gateway). My problem is the following: If I
>>> ping the ppp tunnel from an other computer, my laptop recieves the
>>> ICMP6 echo request over the ppp tunnel, but it answers over the wlan
>>> interface. I read some similar posts (only ipv4) about forwarding with
>>> IPFW,
>>> but I was unable to solve my problem until now.
>>>
>>
>>  [...]
>
>>
>> the theory with multihoming is that unless you are the holder of a class-C
>> (/24) you basically have to do it using NAT.
>> You have to make some subset of  your traffic use one NAT while the
>> remainder uses another (or is untranslated).
>> Unfortunately we don't have NAT for IPV6. I don't know how that
>> gets solved..
>>
>
> I am not sure I understand how NAT would solve the routing problem. Doesn't
> a packet have the next hop set according to the destination, that is
> anything not for a locally attached network will go to the default router?
> Zgabe is correct in trying to use fwd, I use that to route packets
> according to the source. I use this method, in ipv4, although perhaps too
> intrusively as I also fwd packets that should go to the default route (which
> could be instead just accept'ed), but this is another topic.
>
> For zgabe problem, aren't packets coming from the pppaddress going through
> the ppp interface. So why don't you try to select them by the interface (and
> the direction they go through it, as in out xmit ppp) rather than by
> protocol? Not sure how will you enter an ipv6 address as a forwarding one,
> it does not work on my setup (macos).
>
> g
>