This document explains how to debug a distributed DDS system when there is no communication, or sub-optimal communication, seen between publishers and subscribers.
There are various strategies that can be used to have DDS applications communicate between each other despite the fact that one or more of these applications are protected by a firewall. This HOWTO focuses in the situation where there is a desire to use static configuration (i.e. manually open specific ports or multicast addresses in the firewall) and the applications are protected with Firewalls but are not behind Network Address Translators (NATs).
