IPCop forward external to external red

Posted on 2011-09-28
Last Modified: 2012-05-12
Hi Experts,

What we are trying to do is route or forward traffic that comes to our external ip (x.x.x.x) to another external ip (y.y.y.y).

We know how to forward from external to internal but we are looking to go red to red.

Any Ideas

Question by:nikdonovanau
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LVL 10

Expert Comment

ID: 36813795
With the default settings of IPCop, this is not possible, because IPCop is cutting traffic from red to red..

Possible workarounds:

1. let the modem/router do that, upstream, or
2. add an iptable rule in your /etc/rc.d/rc.firewall.local file allowing traffic from x.x.x.x to y.y.y.y, or
3. forward the traffic to some host inside your LAN or DMZ that is going to re-forward that traffic to y.y.y.y

Good luck.
LVL 10

Accepted Solution

pfrancois earned 500 total points
ID: 36814032
I advice you workaround #2. You will have to add the rules after the line containing "start)".

Author Closing Comment

ID: 36818509
Thanks for the advise. Much appreciated.
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Author Comment

ID: 36901437
For anyone out there trying to do this.  This is how I achieved it.

After start) in /etc/rc.d/rc.firewall.local

/sbin/iptables -t nat -A CUSTOMPREROUTING -p tcp -i wan-1 --dport [port] -j DNAT --to-destination [dest_ip]:[dest_port]

/sbin/iptables -A CUSTOMFORWARD -p tcp -i wan-1 -d [dest_ip] --dport [dest_port] -j ACCEPT

Thanks a lot.
LVL 10

Expert Comment

ID: 36902004
Thank you for this very useful complement of information. Instead of option "-i wan-1", I would say "-i $RED_DEV", right?

Author Comment

ID: 36908063
Sure I think you can use the variables from the config file.

My config file seemed to have $RED_DEV_1 or somthing like that so I chose to just hard code the name of my wan ethernet interface.

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