Find WAN ip from behind router

Rizla · 05-21-2005, 04:59 AM

How can i find out the WAN ip of my network from a linux box within that network?
Thanks

jollyjoice · 05-21-2005, 07:42 AM

http://www.whatismyip.com/

Only works if you don't use proxy.

Rizla · 05-21-2005, 08:28 AM

Yeah, i can visually find out my ip address by looking at my router settings. I need to be able to store my WAN ip so i can use it dynamically in an app i'm writing. Any other ideas?

jollyjoice · 05-21-2005, 08:32 AM

you could write a script to extract it and save it in a txt file...

Rizla · 05-21-2005, 08:45 AM

I guess I could wget the page, trawl through the source, extract my ipaddress etc. I just thought that linux, in it's infinite wisdom, would have a function or pre written script that does it for you, save reinventing the wheel and all that.
Thanks again

jollyjoice · 05-21-2005, 08:47 AM

it probably does, could you ping yourself ...??? sorry, thinking aloud again.

Rizla · 05-21-2005, 08:57 AM

No, traceroute will print it but still in the same position. Maybe there is a java or c function that'll do it?
Silly thing is is that this was just a time saving application and it's kinda defeating it's point now!
Thanks again

Rizla · 05-27-2005, 04:19 AM

Just thought i'd post some solutions i found:

Code:

wget -q -O - www.whatismyip.com | perl -pe 's/.*ip is ([^<]+).*/$1\n/ig'

OR

Code:

wget -q -O - www.whatismyip.com | cut -d' ' -f4 | cut -d\< -f1

OR

Code:

wget -q -O - www.whatismyip.com | awk '{print substr($1,index($1,"Y")) " WAN " $2 " " $3 " " sub *str($4,1,index($4,"<")-1)}'

Not sure if they all work properly but should help someone with the same problem

Cheers