Getting WAN IP in a script

[david3]

I used to use Tomato firmware, and I have scripts that use the WAN IP.

I could get it like this:

#!/bin/sh
WANIP=$(nvram get wan_ipaddr)
echo $WANIP

Now I've updated my router (an Asus RT-N66U) to use Asuswrt-Merlin firmware, and I guess it doesn't work the same way, since the above code isn't giving me my WAN IP.

What's the best way to get the WAN IP for Asuswrt-Merlin?

The above does get an IP, but it's not my current IP (maybe an old one?)

Thanks.

 

[JDB]

I'm on my phone so don't have one to hand, but take a look at the example custom DDNS scripts available. I expect one of those will do it.

https://github.com/RMerl/asuswrt-merlin/wiki/DDNS-Sample-Scripts

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[ColinTaylor]

Both wan_ipaddr and wan0_ipaddr work for me.

Edit: There's also wan1_ipaddr for dual WAN support.

 

[JDB]

The nvram command also works for me.
As an alternative though I just did this and it also works (assuming eth0 is your WAN port);
ifconfig eth0 | grep "inet addr" | sed -r 's/.*r.*) B.*/\1/'


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[john9527]

Use wan0_ipaddr
wan_ipaddr is a gui only construct that reflects the address in effect the last time you accessed a page that needed the wan address.

 

[david3]

Thanks, it looks like wan0_ipaddr is working.

#!/bin/sh
WANIP=$(nvram get wan0_ipaddr)
echo $WANIP

wan_ipaddr returns something different. Maybe the previous or an old WAN IP address.