Loopback behind Modem

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atruskie
DD-WRT Novice


Joined: 07 Nov 2010
Posts: 1
PostPosted: Sun Nov 07, 2010 6:42    Post subject: Loopback behind Modem Reply with quote
Hi all,

My setup is:

ADSL 2+ modem - Dynalink RTA1320 - Does not support loopback, WAN IP (example): 123.123.123.123, Internal IP: 192.168.1.1, DMZ: 192.168.1.2

Connected to Asus RT-N16 running DD-WRT v24-SP2 (14896) - WAN IP: 192.168.1.2, internal IP: 10.0.0.1

Connected to web server: 10.0.0.254
and to file server: 10.0.0.253

I have already setup DnsMasq to route requests to my domain to the webserver (adress=/mydomain.com/10.0.0.254). However, I now have several domain names and managing them is a little trickier.

I would like for DD-WRT to reroute any outgoing request to my internet WAN IP (123.123.123.123) back to itself (so port forwards can take effect) without going to the adsl modem.

I think this is different from normal loopback behavior because that normally just uses one device...

Is this possible?
Cheers
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phuzi0n
DD-WRT Guru


Joined: 10 Oct 2006
Posts: 10141
PostPosted: Sun Nov 07, 2010 7:13    Post subject: Re: Loopback behind Modem Reply with quote
atruskie wrote:
I would like for DD-WRT to reroute any outgoing request to my internet WAN IP (123.123.123.123) back to itself (so port forwards can take effect) without going to the adsl modem.

It's not that simple, you have to NAT to the final destination:port not the router itself.

iptables -t nat -I PREROUTING -p [tcp|udp] -d [WAN IP] --dport [port] -j DNAT --to [LAN IP]:[port]

http://www.dd-wrt.com/wiki/index.php/Iptables
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