Logging into a computer behind a router?

[James Knott]

Alex Maynard wrote:
> Hi All:
> 
> I am confused by what may be a fairly basic networking question:
> 
> I have two linux computers attached to a Linksys router, one of which
> I would like to be able to log into from both the other computer and from
> my office.
> 
> If I use the address that I get from /sbin/ifconfig I am able to login
> from the other computer linked to the same router, but not from outside.
> 
> Also the address I get from /sbin/ifconfig is entirely different from the
> one I see if I go to http://ww2.economics.utoronto.ca/whoami.php, which
> reads off IP addresses and the IP address that I read off from that page
> is the same for both computers hooked up to the router.  So I am guessing
> that this is the router address and that the outside world is only seeing
> as far as the router and can't get past this?  Does that sound right? If
> so, does anyone know of a simple way to change this so that I can log in
> from outside?

You're likely using a router with Network Address Translation, which
means that the address you have on that computer is not accessable from
outside your local network.  You'll need a VPN, to connect to it or use
port forwarding.
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