[6bone] freebsd src addr wrong

[Jeroen Massar]

David Waitzman wrote:

> I have a 6bone tunnel connection with a non-routed tunnel 
> endpoint 2001:: 
> address.  I also have an official 6bone 3ffe:: address, which 
> is assigned 
> to one of my ether interfaces.
> 
> When I "ping6 www.kame.net" I see that my side of the tunnel 
> is used as a 
> source address.  I don't get ping responses back (presumably because 
> www.kame.net does not know where to send responses, given 
> that the address 
> it is getting is not routed).
> 
> If I do a ping6 -S, selecting my 6bone 3ffe:: address as the 
> source, then 
> ping6 gets responses from kame just fine.
> 
> I am using FreeBSD 4.6.
> We run Zebra-based BGP+ with our tunnel provider and thus 
> have no default 
> route.
> 
> My questions:
> 1. Should tunnel endpoint addresses be routable?

They should be reachable thus they should be 'routable'.

> 2. Or how do I force FreeBSD to use the ether's IPv6 address 
> as a source by 
> default?  (Not all applications have the equivalent of 
> Ping6's -S option to 
> force the source address selection.)

Get yourself a decent OS with sourcerouting.
Also your upstream SHOULD filter out any prefixes of source addresses
not belonging to them (aka eggress filtering :).

And yes this breaks 'multihoming', at least the way some people define
it.

Greets,
 Jeroen