Public ip address

[kee nethery]

When I need to access servers through a firewall from some remote 
place, the IP address of my machine is typically not the IP address the 
firewall is going to see. The only way to determine my IP address is to 
hit a remote server that tells me what my IP actually is, then I enter 
that into the firewall. It is rarely the IP address that my machine is 
using.

How you determine your IP address depends entirely upon what you are 
planning to do with that information.

Kee Nethery