3 interface firewall problem

[Geordie Williamson]

This is a very common problem. The problem is that your external interface 
(1.2.3.5) is only listening on 1.2.3.4 and not 1.2.3.5, 1.2.3.6, and 
1.2.3.7.

What you need to do is create alaises on the external interfaces so that the 
external interface is "listening" on those addresses as well. You can add 
aliases using either the ifconfig or ip commands (or linuxconf for 
simplicity).

I recommend using linuxconf if you're new to adding aliases to interfaces. 
Go to linuxconf click on Networking --> Server Tasks --> IP Aliases for 
Virtual Hosts and add 1.2.3.5, 1.2.3.6 and 1.2.3.7 on your external 
interface.

Hope this is of assistance! Geordie.

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