[YLUG] Finding the external IP of a linksys router

[Richard G. Clegg]

Stephen wrote:
> On 22 May 06, Craig Genner (craig at gennerfam.freeserve.co.uk) wrote:
> 
>>curr_ip=`wget -q -O- http://www.whatismyip.com/ | grep "Your IP is " - | cut 
>>-d" " -f4`
> 
> 
> Thats neater than my first thought (at least the html is) - load the router's
> status webpage which has its external IP & grep through that.
> 
> I'll post the actual script when I've got something figured out.
> 
> hmmm, looks like gpg's gone snafu :(

If you are always connecting via the same ISP you could ping 
somewhere.nearby.net -R | head -5 | tail -1

E.g. for me

richard at barq:~ $ ping www.zen.co.uk -Rn | head -5 | tail -1
         217.155.198.94

This relies on you having pretty much the same ping version I do. 
There's probably a less hackish way of doing that last bit too!

-- 
Richard G. Clegg,
Networks & NonLinear Dynamics Group,
Dept. of Maths, Uni. of York.
http://www.richardclegg.org/