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Date:      Thu, 9 Aug 2001 12:26:58 -0400 (EDT)
From:      Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
To:        Jonathan Chen <jon@FreeBSD.ORG>
Cc:        net@FreeBSD.ORG
Subject:   forwarding broadcast
Message-ID:  <200108091626.f79GQwx16785@khavrinen.lcs.mit.edu>
In-Reply-To: <20010809113638.A9519@enterprise.spock.org>
References:  <20010809113638.A9519@enterprise.spock.org>

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<<On Thu, 9 Aug 2001 11:36:38 -0400, Jonathan Chen <jon@FreeBSD.ORG> said:

> I just want to ask around in case I turned out to be doing 
> something incredibly evil.

Directed Broadcast is generally discouraged, and a BCP was published
not too long ago officially deprecating it (updating the router
requirements to require such a function to default to `off').

More general forwarding of broadcasts is impossible without an
appropriate routing protocol; all such protocols currently in
existence are targeted at multicast, and not broadcast, since
multicast is the correct, officially-sanctioned way to make such
transmissions.  (You'll note that multicast is a mandatory element of
IPv6; IPv6's analogue to ARP uses it instead of interrupting every
machine on the network.)

-GAWollman


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