How do I ping the SPA? I know the IP address.

[eric]

Most computers have a "ping" command line utility that can be used. This includes Windows, Mac OS X, Linux, FreeBSD, and most others. Simply type in the command ping x.y.z.w at a command prompt, where x.y.z.w corresponds to the IP address of your SPA.

[Coder1251]

Or if you want to know "eternal ip" of SPA you can use for ping some external source...
for example http://my-addr.com/ping-ip-domain-ho.../ping_addr.php