Re: remote broadcasts


Jim Warner (agate!saturn!eshop@ucbvax.Berkeley.EDU)
9 Mar 88 15:59:09 GMT


There is no guarantee that any particular (sub)net that you're
sending to supports broadcasting. This topic is discussed
in RFC1009, mostly in appendix A. Briefly, the local gateway
may forward a "directed broadcast datagram", but not through
the interface that it came in. A local gateway is permitted
to black hole a directed broadcast. Presumably, there should
be a software switch.

It may be useful to remember that intermediate gateways may
not be able to determine if a particular IP address is a broadcast
address unless they know the local subnet mask. Thus disgarding
directed broadcasts is always done by the gateway guarding the
destination net.



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