setup external client within location

If you want to see what address you are using while on the net, go here:
http://speedtest.tds.net/

It will show you what address you are using.

You can also use
  http://www.whatismyip.com
or  
http://www.canyouseeme.org
The latter will also allow you to test if ports for various services you have enabled are open.

You can also use a web based ping tool to ping your IP if ICMP (ping) requests are set to be allowed by your firewall.

I have to setup a client computer that when inside the internal network I can type the external ip and get to the internal. I have one internal ip that is configured with NAT to an external ip. When I am inside the network and type in the external ip I get an error, different subnet. I have to go off site outside the network to test the external ip. I would like to do this from inside the location. I need to set up a computer that has a the same subnet as the external ip coming in.

Are you saying you want to go and back in through the same router? If so, "hair-pinning" is not possible with most routers.

That sounds right.

Thanks stevek65. Good luck with it.
Cheers !
--Rob