Dual Internet Routing Questions

[Rick Meyer]

Hi All, 
 
How can I route internet traffic from two separate network connections to my
fedora Core 2 Linux box. I have three network cards installed, eth1 is my
primary internet connection.  Eth2 is my second internet connection which
receives requests for the web server.  Eth0 is my internal network
connection.
 
If a request is made on Eth2 the system currently uses the default gateway
(eth1) to send the answer back. 
 
How can I build the routing tables so that if a request originates on eth2
that it uses eth2 to send the answer back to the client? and if a request is
received on eth1 that the system uses eth1 to send the answer back?
 
Internet1 (eth1) <-----> |Fedora | -----> Eth0 -----> Internal network
Internet2 (eth2) <-----> |Core 2 |
 
By the way eth1 and eth2 have dynamic ip addresses.  Is there a helpful
script for doing this?  I don't have anything special loaded on the fedora
core 2 system - perhaps I need to load some routing software?
 
Thanks
Rick Meyer
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