ttl-exceeded sourced by arrival interface ?

[cswiger at mac.com (Chuck Swiger)]

Julien Lesaint wrote:
> Quick reminder: in the case the route to the packet's source is not the
> interface this packet arrived on, do we have a way to source ICMP errors
> (ttl-exceeded) with the original interface's IP address ?

Yes.  Use IPFW's fwd mechanism, or even set a host route for the source IP 
address pointing to whichever interface you please.

> Currently the box is sending ttl-exceeded with the IP address of the
> interface the route to the sender is pointing at.

That's what the routing table is supposed to do, yes.

-- 
-Chuck