[AG-TECH] That freezin' rat

Randy Groves randy.groves at boeing.com
Fri Jan 23 12:36:58 CST 2004

This is the first I've heard of a specific port (47000) in respect to the 
operation of the RAT.  Am I to understand that this is a port local to the 
host upon which RAT is running?  If so, how would a firewall enter into the 
picture?  Unless you are talking about a on-host firewall?


At 01:23 PM 1/22/2004, Colin Perkins wrote:
>--> "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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