Date: Tue, 10 Dec 2002 21:30:25 -0500 From: "Charles Swiger" <cswiger@mac.com> To: "Joshua Graessley" <jgraessley@apple.com>, <freebsd-net@FreeBSD.ORG> Subject: Re: broadcast over loopback Message-ID: <00cc01c2a0bd$43e465a0$0301a8c0@prime> References: <AC433B63-0BCB-11D7-BD2E-000393760260@apple.com>
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Joshua Graessley wrote:
[ ... ]
> If someone is using broadcast for a service discovery protocol instead
> of multicast, they would want services, whether running locally or
> remotely, to receive that broadcast.
Sure, since the thing doing service discovery may not be the same as
the thing (or things) advertising services.
> If loopback is the only interface, it might still be desirable to find
> services running on the local machine.
Besides, giving the loopback special case behavior when it's not needed doesn't
strike me as a good idea. Presumably one would want to remove the second test:
/*
* Multicasts with a time-to-live of zero may be looped-
* back, above, but must not be transmitted on a network.
* Also, multicasts addressed to the loopback interface
* are not sent -- the above call to ip_mloopback() will
* loop back a copy if this host actually belongs to the
* destination group on the loopback interface.
*/
if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) {
m_freem(m);
goto done;
}
...around line 380 of /usr/src/sys/netinet/ip_output.c, and rebuild the kernel
to test your suggested change out.
-Chuck
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