How to setup ip mapping 1:1 nat on OpenWrt?

isslam · December 30, 2019, 12:33pm

i want to configure this photo setting to openwrt how to use iptables to configure that setting like the screenshot ? thanks in advance

lleachii · December 30, 2019, 1:35pm

Please provide more information:

Your screenshot shows the same Local and Public IP, this is incorrect
Please identify the Interface name that possesses the Public IP
Please identify the Local Interface (e.g. lan)

rj-45 · December 30, 2019, 4:24pm

I think the screenshot doesn't show any OpenWrt webinterface.

lleachii · December 30, 2019, 4:53pm

Correct, the OP wants to know how to configure this in OpenWrt...at least from what I understood.

isslam · December 30, 2019, 6:04pm

Public interface that has public ip pppoe-wan
Local interface br-lan
I setup secondary ip lan in modem with 55.55.11.1 which is gataway that i purchased from isp
And use multi ip nat like photo these are ip i purchased

mikma · December 30, 2019, 6:13pm

Does your modem-router support static routes? Then you should add a static route to the LAN subnet of the openwrt router. Which hopefully allow you to configure IP Address mapping on the modem-router using IP addresses from the LAN subnet of the openwrt router as "Local Start IP". Otherwise you will get double NAT 1:1.

(Iptables should support 1:1 nat using SNAT and DNAT targets. Openwrt has firewall redirect, but the wiki doesn't mention anything abount 1:1 nat, and I haven't tried it.)