I'm not sure I understand the question correctly, but you might want to take a look into standalone/configuration/standalone-ha.xml,
and at the very bottom, there are socket bindings, port offset, interfaces and other network related elements and attributes.
You pick the configuration with -c option on startup: e.g. ./standalone.sh -c standalone-ha.xml.
BTW: Have you considered moving to Wildfly, the JBoss AS 7's successor? If you are migrating from Tomcat, I strongly suggest you start your journey with Wildfly:
Downloads · WildFly which is effectively JBoss AS 10+, whereas you are asking about JBoss AS 7....