[KLUG Members] Routing and Firewalling

[Jeremy Leonard]

I have an issue I'm not sure how to solve.

I have a client with 2 T1 lines to the Internet.
They each connect to seperate ISPs..

The first is for general Internet traffic.
The second is for access to their ASP.

In the firewall/router. A SUSE 10 box.

I have a static route for their ASP's subnet set to the ASP T1.

I have the default route set to the general T1.

Everything works fine with browsing and access to the ASP.

The issue this:

When the ASP tries to send email to the client the firewall drops the 
packed saying "martian source".

We just replaced a Novell BorderManager with this box and it worked 
perfectly with BMGR.

Where should I look to fix this? Is it a routing issue or a firewall 
rules issue?

The second part is this:

I have an email server behind this firewall and I want it to send mail 
using a specific public IP address. NOT the default public IP address of 
the firewall.
I've added an alias interface with the appropriate IP and incomming 
email works fine but out going goes through the primary IP address.

Thanks,
Jeremy Leonard.
CNE, CLE, MCSE, CCA, CLS, CNS, A+