The XPMP2 Remote functionality is designed with a "zero config" approach. In all normal situations you should not need to change how XPMP2 Remote uses the network. If you have some very special setup, in which you need to use different multicast addresses, TTL values, ports, in which you want some plugins to serve as senders, but other XPMP2-based plugins not...then there is a chance to influence the setup. I will not go into details here, though. You'd be an expert anyway, so go and have a look at the provided text file
XPMP2-Remote/Resources/XPMP2.example.prf. Comments explain how to use it.