The -b parameter is documented in the Stat Upgrade Notes, Pag.14 and it should be set.
Mainly, it is used to set and bind the address interface for the JBoss/Wildfly Application Server (AS).
-b=<value> | Sets system property jboss.bind.address to <value>. See Controlling the Bind Address with -b for further details.
Controlling the Bind Address with -b:
WildFly binds sockets to the IP addresses and interfaces contained in the <interfaces> elements in standalone.xml, domain.xml, and host.xml.
The standard configurations that ship with WildFly includes two interface configurations: Management and Public.
<interfaces>
<interface name="management">
<inet-address value="${jboss.bind.address.management:127.0.0.1}"/>
</interface>
<interface name="public">
<inet-address value="${jboss.bind.address:127.0.0.1}"/>
</interface>
</interfaces>
Additional information can be found at the WildFly documentation:
https://docs.jboss.org/author/display/WFLY9/Command%20line%20parameters.html