Greetingz!
First, find your external IP address; From your webserver, go to whatismyip.com or icanhazip.com.
When you're outside your internal network, use that IP as the URL. Example:
http://127.0.0.1
Note: You may want to secure your site. Look into .htaccess, iptables, and maybe httpd.conf security.
ProTIP: Go to a free DNS provider like DynDNS.com to get a domain name.
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