Port Forwarding From Second Router

Question

I have the following setup at work, of which I'm impromptu in charge of:

Internet(Modem) <-> Smoothwall (firewall/dhcp/nat) <-> Servers/PCs

I need to be able to add a second broadband line in, preferable like this:

Internet_1(Modem) <-> Smoothwall (firewall/dhcp/nat) <-> Servers/PCs <-> Internet_2(Router)

I need to be able to port forward from a second broadband line using another router (Billion 7800N) to a windows 2008 server on the network.

What I can do:

What I can't do:

What I have tried:

Suggestions appreciated.

If you can't change the firewall config, I would just stop until you can... — Daniel Widrick, Feb 26, 2014 at 13:38
Unfortunately, there are all sorts of ports forwarding to IP's on Internet_1 that I have no control over. The reason for the additional line is the increasing unreliability of the first line. It goes down briefly, and slows down for longer. Phone line company have not managed to fix. I need to slowly migrate things to second line, once tested, and get others to do the same, those that can change Ip's etc. I'm in a bind, struggling to move forward. — Dom, Feb 26, 2014 at 13:56

codehitman · Accepted Answer · 2014-02-26 14:41:58Z

1

Some ideas:

Try putting the second router between the modem and Smoothwall. Then port forward from the new router to Smoothwall.
Same as the first but instead of port forward, use the new router as a switch.
Local port forwarding on one of the servers via SSH or loopbacks. https://help.ubuntu.com/community/SSH/OpenSSH/PortForwarding
Create a bridge between the two routers.

Hope this either helps or creates a spark!

answered Feb 26, 2014 at 14:41

codehitman

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Those may be beyond the limits of what I am allowed to risk changing, but I will certainly look into those options, thanks :)
– Dom
Feb 26, 2014 at 15:49
Just out of curiosity and for everyone else's benefit, could you please tell me what worked?
– codehitman
Feb 28, 2014 at 14:40

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