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Old 01-13-2004, 11:56 AM   #1
GuitsBoy
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Registered: Oct 2003
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Dual Homed server / Two ISPs


Hi all,

I have a redhat 8 box with dual nics installed. I have each of the two nics patched into t1's from different ISPs. If I only have one interface up at a time, either will work, but If I try and have both interfaces activated, only one of them will work, in this case, eth0. I have tried running routed but this does not help. I have tried creating a few different iptables rules, but im only fumbling around and have not had any success.

What should I be doing in order to have both network links up at the same time.

With both links active, I can only ping eth0 from an outside host. I suspect it has something to do with changing the default route dependant on where the incoming packet came from, so that if a packet came in on eth0, it goes out on eth0 and not eth1.

Any help is greatly appreciated.
-Tony

Last edited by GuitsBoy; 01-13-2004 at 11:57 AM.
 
Old 01-13-2004, 12:23 PM   #2
WeNdeL
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Distribution: RedHat, Fedora, Ubuntu
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iproute2 will enable you to do this...

There is a howto on the web about using a Linux router with two ISP's. I don't have the link anymore but try googling it.

I would advice that you read as much as you can on it too. The howto is sorta encompassed by the Advanced Routing Howto on www.tldp.org. The label "advanced" is fitting given the subject matter.

Last edited by WeNdeL; 01-13-2004 at 12:24 PM.
 
Old 01-13-2004, 03:32 PM   #3
GuitsBoy
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Thanks for the reply. I was able to find some directions here:

http://lartc.org/howto/lartc.rpdb.multiple-links.html

Rather straight forward for the most part.

Thanks,
-T
 
Old 01-13-2004, 03:37 PM   #4
WeNdeL
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that's the one there fruit-cup...
 
  


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