Hi list,

is it true that Shorewall is not willing to forward traffic from a source-ip
which is not reachable by a static route from Shorewall itself? To say it on
another way. If Shorewall´s routing interface is neither connected nor able
to reach that source ip does it forward or deny it?

So the situation is the following. I send from an ip which is not part of
interface nor hosts file. But Shorewall should forward that packet as well
matching the default route without knowing a way back to the source ip. 

All I see is a packet arriving on the local interface but I don’t see it to
leave the eternal one nor I see any drop or reject by shorewall. If I tell
Shorewall the route to the source ip it works fine but I don’t want this
route to be configured and I want to know if this is maybe a Shorewall
feature which can be turned off? And if it is a Shorewall feature does
anybody knows if there is an article to read about?

The same feature is available von Cisco, there it is called
ip-verify-unicast-source-reachable. 


Thanks
Mike


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