Can I determine a machine's outward facing IP with PHP without relying on external services?

Posted by editor on Server Fault See other posts from Server Fault or by editor
Published on 2011-01-13T17:44:21Z Indexed on 2011/01/13 17:55 UTC
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Filed under:

networking

|

php

|

ip

I'm working with an API that requires the machine's external IP. As far as I know, the PHP environment I'm using can only get our internal IP.

The option on the table is using an external service such as whatismyip.com to tell us:

wget -q -O - http://whatismyip.com/automation/n09230945.asp

My concern is what happens if that fails. Is there a bulletproof way of determining a machine's IP without relying on external services?

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