[AG-TECH] That freezin' rat

Colin Perkins csp at csperkins.org
Thu Jan 22 15:23:47 CST 2004

--> "Don Morton" <Don.Morton at umontana.edu> writes:
> Before I go off into all sorts of wrong directions,
> I thought I'd ask for advice here.....
> I have a RedHat 7.3 setup, connected to multicast,
> and vic works fine, both transmitting and receiving.
> On rat, however, it just hangs when I try to launch 
> it, as in
> rat   (or any address I give it, even
>                            if it's a unicast to a QuickBridge)
> This happens with a rat from AG1, and the rat from the most
> recent AG2.
> I know someone else ran into this when she was on a bad network,
> but that's not the case here.
> Is this something that others see frequently and might have quick
> workarounds for?

Rat uses host local multicast as an inter-process communication mechanism.
If rat doesn't start it's most likely because this isn't getting through:
either a firewall issue (udp port 47000) or a multicast routing issues.

Colin Perkins

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