How to Get Public IP From LinkSys Router?

[Drew Tomlinson]

----- Original Message ----- 
From: "Matthew Emmerton" <matt at compar.com>
To: "Drew Tomlinson" <drew at mykitchentable.net>; "FreeBSD Questions"
<freebsd-questions at freebsd.org>
Sent: Wednesday, September 03, 2003 3:52 PM
Subject: Re: How to Get Public IP From LinkSys Router?


> > > > I need to get my public IP address from a LinkSys cable router
and
> > don't
> > > > have any idea where to start.  The LinkSys is doing NAT and my
FBSD
> > box
> > > > in on the private network on the inside.  What commands and/or
ports
> > are
> > > > there that would provide the public IP address from the command
line
> > so
> > > > I pass the IP to a script?  Any ideas?
> > >
> > > The way I do it with my router (BEFW11S4 V2) is to use lynx to
> > download the
> > > HTML status page from the router and extract the public IP
address.  I
> > do
> > > this in a cron job every 15 minutes, and when it notices an IP
change,
> > it
> > > fires off my dynamic DNS updates.
> >
> > This seems like the best way.  Would you be willing to share your
script
> > that grabs the status page and extracts the IP?  I'm not very good
with
> > regular expressions yet and would appreciate the kick start.
>
> The sequence of commands I used is quite dependent on the format of
the page
> (which has changed in the past after firmware upgrades).
>
> /usr/local/bin/lynx -dump -auth=username:password
http://routerip/Status.htm
> | /usr/bin/grep "IP Address" | /usr/bin/tail -1 | /usr/bin/awk ' {
print
> $3 } '

Thank you!  That works on my regular BEFW11S4 (no version) at firmware
level 1.44.2z, Dec 13 2002 (the latest for this model).

Drew