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From: mickey@altos86.Altos.COM (Michael Thompson)
Newsgroups: comp.protocols.tcp-ip
Subject: How to limit broadcasts between expensively connected networks?
Message-ID: <3715@altos86.Altos.COM>
Date: 11 Jul 90 00:22:39 GMT
Organization: Altos Computer Systems, San Jose, CA
Lines: 27


I have two local area networks connected via a slip connection over X.25.
(I know it's a hack, but I do get reasonable throughput)

		     gateway-A			   gateway-B
      144.1       ---------------   X.25(slip)	----------------  192.68.19
      (ethernet)  | 200.2.10.1  |<<----------->>| 200.2.10.2   |  (ethernet)
    <<---------->>| 144.1.10.98 |		| 192.68.19.42 |<<--------->>
		  ---------------	        ----------------
		  gateway to 200.2.10           gateway to 200.2.10
		  gateway to 192.68.19	        gateway to 144.1

When the gateways are configured as above, I can ping any machine on the
192.68.19 network from anywhere on the the 144.1 network (and vice versa).
However, I notice a lot of traffic across the X.25 line that I am guessing are
broadcasts (maybe from rwhod and/or timed??).  These broadcasts seem to
originate from machines other than the gateways since if I don't make
them appear as gateways between 144.1 and 192.68.19 the traffic is eliminated.

My question is: is there any way to (at the gateways) limit broadcast traffic
over expensive connections?


				Thanks,

				-Michael
				mickey@altos.Altos.COM