Date: Wed, 18 Aug 1999 22:46:41 -0700 From: George Chung <gchung@microsoft.com> To: 'Mike Nowlin' <mike@argos.org> Cc: "'freebsd-net@freebsd.org'" <freebsd-net@FreeBSD.ORG> Subject: RE: on dual-homed machine, how to specify outgoing interface to s end multicast packets Message-ID: <C35556591D34D111BB5600805F1961B910ECC111@RED-MSG-47>
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you're right, I can't ping the address. so how do I fix that?! :-) -----Original Message----- From: Mike Nowlin [mailto:mike@argos.org] Sent: Wednesday, August 18, 1999 10:27 PM To: George Chung Cc: 'freebsd-net@freebsd.org' Subject: Re: on dual-homed machine, how to specify outgoing interface to send multicast packets > 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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