[plug] Routing question

[Paul Day]

Wondering if anyone has any ideas on this one.

I have two PPP interfaces. I have a default route out ppp1. A bunch of
specific routes out ppp0, and a second default route with a higher metric
out ppp0. Everything works dandy for me inside my LAN (obviously).

Someone connects to my machine through the IP on ppp0. My routing table
says "To get to this person you have to go out ppp1" so the reply data
goes back to them through ppp1, with the IP address of ppp0. The packet is
dropped (ISP presumes it's spoofed?), the connection is never established.

Is there an easy fix to this? ie, something along the lines of: "If an
incoming connection is amde on ppp0, reply via ppp0 even if we have a
route with a better metric out ppp1."

Thanks.

Cheers,
Paul