Date: Wed, 19 May 2004 13:56:46 +0300 From: Ruslan Ermilov <ru@FreeBSD.org> To: Eugene Grosbein <eugen@kuzbass.ru> Cc: net@FreeBSD.org Subject: Re: multicast arp entry Message-ID: <20040519105646.GB25177@ip.net.ua> In-Reply-To: <40AB35DE.DF743CCB@kuzbass.ru> References: <40A9CF72.85E2EC9D@kuzbass.ru> <20040518105134.GC70919@ip.net.ua> <20040518140857.GC20471@grosbein.pp.ru> <20040518151506.GC72684@ip.net.ua> <40AB35DE.DF743CCB@kuzbass.ru>
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--H+4ONPRPur6+Ovig Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, May 19, 2004 at 06:24:30PM +0800, Eugene Grosbein wrote: > Ruslan Ermilov wrote: >=20 > > > > The long answer could be: you could join to a single multicast > > > > group on multiple interfaces, and you will be able to receive > > > > multicast on all of them, but if you don't have multicast > > > > forwarding enabled, only one interface will be used for sending. > > > > > > That's bad. How do I enable "multicast forwarding", or, in other word= s, > > > do you know why ripd doesn't do it for be? > > > > > I use mrouted(8). > >=20 > > > On the other hand, I've got another machine with very simple configur= ation: > > > one fxp0 interface, one rl0 and one gif0 and started quagga/ripd. > > > Two points: tcpdump shows that multicasts go out all three interfaces > > > with right source IP and there is no arp entries for 224.0.0.9 and 22= 4.0.0.1. > > > > > > I couldn't find what is the vital difference between these two machin= es yet > > > (there are so many of them). > > > > > I don't know. Perhaps, quagga/ripd send raw IP packets in this case. >=20 > No, it does not. >=20 > I've finally found that one need not MROUTING and mrouted just to send > RIPv2 multicasts out via several interfaces and FreeBSD does it right > by default. But if outgoint multicast packet is diverted to ipacctd > accounting daemon using 'ipfw divert' then it is sent to an interface > pointed by route to 224.0.0.9 instead of right one > (no such effect for P2P interfaces, though). >=20 Care to share the experience of how you were able to send multicasts out several interfaces without tmulticast forwarding using mrouted(8) or its equivalent? Cheers, --=20 Ruslan Ermilov ru@FreeBSD.org FreeBSD committer --H+4ONPRPur6+Ovig Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFAqz1uUkv4P6juNwoRAr8qAJ9YpdY0ykGKpGOQkJKMRDdWxFIRkwCeJXKm En/LF1Kq4lg99PMwsBvN/4A= =JWQE -----END PGP SIGNATURE----- --H+4ONPRPur6+Ovig--
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