try starting with standalone.bat -b 0.0.0.0
that should bind it to all interfaces
Normally we use some kind of intermediate (privileged) process such as Apache httpd to listen on port 80 and forward requests to your JBoss instance. There's a bit of info on this at AS72 Apache httpd but it's a bit thin at the moment. This arrangement is quite common though and a bit of googling should get you more details.