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Hello,
I've searched high and low to find the answer, and so I come here hopeing that one of
you fine people will be able to help.
I have a situation where I have two ISPs supplying me with static IPs. I have a
server (www, mail, etc...) that needs to be accessed by either ISP. I've got two NICs
in the machine now, set to the corresponding IPs. My problem is this:
With my 2.2.x kernel, there is only one default route. So if I set my default route
to be ISP A, traffic comes in from ISP A and goes out ISP A - no problem. However,
traffic coming in ISP B goes out ISP A, where it promptly gets dropped because the ISP
sees the source IP address is not their network.
I tried setting up a masq box on ISP B, complete with the appropriate IPCHAINS and
port forwarding, but am still running into the same problem.
Here's the setup:
ISP A (1.2.3.4) (default route) --------------------
----------------------------------------------+eth0 (1.2.3.4) |
----------------- | MAIN SERVER |
|eth1 (10.0.0.1)+---------+eth1 (10.0.0.2) |
ISP B (20.2.2.2) | MASQ BOX | -------------------
--------------------+eth0 (20.2.2.2)|
-----------------
What I -think- I want is the masq box to rewrite the destination address from a packet
coming in from ISP B to 10.0.0.2, -AND- rewrite the source address to 10.0.0.1. That
way, the main server will reply back to 10.0.0.1, which will then reverse-masq back
out ISP B to the originator.
Does this sound right? Is there a better way? How do I make this scenerio work?
Bob
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