Date: Thu, 19 Aug 1999 01:26:53 -0400 (EDT) From: Mike Nowlin <mike@argos.org> To: George Chung <gchung@microsoft.com> Cc: "'freebsd-net@freebsd.org'" <freebsd-net@FreeBSD.ORG> Subject: Re: on dual-homed machine, how to specify outgoing interface to send multicast packets Message-ID: <Pine.LNX.4.05.9908190124210.22328-100000@jason.argos.org> In-Reply-To: <C35556591D34D111BB5600805F1961B910ECC110@RED-MSG-47>
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> On a dual-homed machine, there is no "network" portion of the destination > Class D address to make any kind of determination as to which outgoing > interface to use. > > So I make a call to > > setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, &inaddr, sizeof(struct > in_addr)); > > I confirm that this call works. Plus I doublechecked by giving it a bogus > inaddr, and it gave me errno 49 EADDRNOTAVAIL. However, when I try send a > packet to "225.0.0.1", I get errno 65 EHOSTUNREACH. First guess is that it's a routing problem... Try pinging that address -- if you get a "route not available" (or similar message), that's probably it. (I'm too brain-fried right now to go into much more detail than that... :) ) --mike To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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