[Linux-disciples] Finding an external IP

[Adam Rosi-Kessel]

Why do you have to run dig from an external machine? Can't you just specify
an @external nameserver?

Stephen R Laniel wrote:
> I want to figure out what IP address the external world sees
> for a given hostname. I could ssh to a remote host and run
> ping -- something like
> 
> ssh remote_host ping -c 1 hostname
> 
> where 'hostname' is the one for which I want the IP. Then I
> could parse the output in various ways.
> 
> The trouble is that a lot of the hostnames I'm interested in
> will give fallbacks. So for instance, I want to know what IP
> address the external world thinks that
> adam.americanprogress.org has. If I just ping it, I'll get
> back 216.234.246.150, when what I really want to know is
> that adam.americanprogress.org is not externally visible.
> 
> As far as I can tell, the best way to discover that bit of
> information is to run dig from an external machine, look for
> the ANSWER section, and munge the results appropriately.
> Which is what this script does:
> 
> http://laniels.org/scripts/remote_dns_query.pl.txt
> 
> If anyone can think of a better way to do what I want, lemme
> know.
> 
> 
> 
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> 
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