Date: Sun, 03 Nov 2019 00:22:01 -0500 From: Mike Karels <mike@karels.net> To: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net> Cc: freebsd-net@freebsd.org, Victor Gamov <vit@otcnet.ru> Subject: Re: FreeBSD as multicast router Message-ID: <201911030522.xA35M1fW052952@mail.karels.net> In-Reply-To: Your message of Sat, 02 Nov 2019 19:09:10 -0700. <201911030209.xA329AwE094172@gndrsh.dnsmgr.net>
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> > > > Hi All > > > > > > > > I have (noob) questions about multicast routing under FreeBSD. > > > > > > > > I have FreeBSD box with two (or more) multicast enabled interfaces (e.x. > > > > vlan750 and vlan299). vlan750 connected to multicast source. > > > > > > > > Then pimd installed and only this two interfaces enabled in pimd config. > > > > Multicast routes successfully installed by pimd and listed by `netstat > > > > -g -f inet` > > > > > > > > Then client on vlan299 send IGMP-Join (this Join received by FreeBSD on > > > > vlan299) > > > > > > > > The question is: who will forward muilticast from one interface > > > > (vlan750) to another (vlan299)? Is it kernel specific job or I need > > > > additional software? > > > > > Please read the manpage multicast(4) "man 4 multicast", > > > you should need to build a custom kernel with the "options MROUTING" > > > to enable the multicast forwarding in the kernel. > > > > If "netstat -g" shows routes, the kernel must have been built with "options > > MROUTING". > Indeed. > > > > The kernel does the forwarding, according to those routing tables installed > > by pimd or another multicast routing program. Is it not working? It sounds > > like you are very close. > Could it be sysctl net.inet.ip.forwarding? Does that still apply to mroutes? No, they are separate. The test is just whether MROUTING is enabled, and whether a multicast router like pimd is active. One other thing to check would be "netstat -gs" (multicast stats). > > > > > > Victor Gamov > > > > > -- > > > Rod Grimes rgrimes@freebsd.org > > > > Mike > -- > Rod Grimes rgrimes@freebsd.org Mike
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