FreeBSD 7.1 IPv6 multihoming problem

[Giuliano Gavazzi]

On T 7 Apr, 2009, at 10:37 , Zöld wrote:

> Hi all!
>
> I think my problem is solved. As I mentioned earlier the ipfw fwd  
> hasn't got
> any effect (under FreeBSD 7.1), but pf (packet filter) can forward  
> among the
> interfaces too.
>
> Here are the commands:
> kldload pf
>
> /etc/pf.conf:
> pass out quick route-to (interface1_name gateway1_address) from
> interface1_address to any
> pass out quick route-to (interface2_name gateway2_address) from
> interface2_address to any
>
> pf -e -f /etc/pf.conf
>
> Now the packets leave the computer over the proper interface  
> independent of
> the default gateway.

very good! unfortunately pf hasn't been ported to the macosx kernel  
yet...
Just a warning, on MacOS X I had kernel panics, when reloading rules,  
in some place inherited from BSD (netinet/ip_fw2.c) and I think they  
were triggered by a fwd to the default gateway. In other words, if a  
packet does not need to be re-routed (that is it should go to the  
default gateway), do not use a fwd, make it an allow rule instead  
(don't know what this is called in pf... pass) as this will have the  
same net effect. I might be completely wrong about this panic and  
might not apply to FreeBSD or pf, of course, but still I see no point  
in routing explicitly what will be routed correctly anyway.

Giuliano