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tl;dr: It looks like the Jackal has a fairly complex network setup; you should contact clearpath support and ask for their advice.

br0 is part of the linux network bridging subsystem; it looks like the Jackal is running some kind of network bridge that spans multiple interfaces. I can't really tell how it's used from your limited description.
On the jackal, I see that eth0 is UP but not RUNNING, which indicates that linux doesn't think there's a cable plugged into that interface. Are you sure eth0 is the interface you're using?