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doc:howto:udp_multicast [2013/04/20 06:47]
gatak
doc:howto:udp_multicast [2014/07/08 12:19] (current)
theoradicus add ipv6
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===== Solutions ===== ===== Solutions =====
Thanks to IGMP snooping, igmpproxy should no longer cause wifi hogging and so you can have both igmpproxy and udpxy configured and running, accessing IPTV over wifi with udpxy when needed. Thanks to IGMP snooping, igmpproxy should no longer cause wifi hogging and so you can have both igmpproxy and udpxy configured and running, accessing IPTV over wifi with udpxy when needed.
 +
 +Please note, that IGMP snooping is only available when **kmod-bridge** package is installed.
==== IGMP proxy ==== ==== IGMP proxy ====
-If your client is behind NAT, it can't subscribe to multicast directly, so it needs some kind of proxy to do it for him. OpenWrt comes with [[http://sourceforge.net/projects/igmpproxy|igmpproxy utility]] to do that automatically. You need to edit ''/etc/igmpproxy.conf'' according to your setup:+If your client is behind NAT, it can't subscribe to multicast directly, so it needs some kind of proxy to do it for him. OpenWrt comes with [[http://sourceforge.net/projects/igmpproxy|igmpproxy utility]] to do that automatically.  
 + 
 +First you need to install package - opkg install igmpproxy 
 + 
 + 
 +You need to edit ''/etc/config/igmpproxy'' according to your setup:
<code> <code>
-quickleave +config igmpproxy 
-# eth1 is the WAN interface +        option quickleave 1 
-# 10.254.0.0/16 is the ip range your ISP sends multicast from + 
-phyint eth1 upstream ratelimit 0  threshold 1 +config phyint 
-        altnet 10.254.0.0/16 +       option network wan 
-# br-lan is LAN bridge +        option direction upstream 
-phyint br-lan downstream ratelimit 0  threshold 1+        list altnet 10.254.0.0/16 
 + 
 +config phyint 
 +        option network lan 
 +        option direction downstream
</code> </code>
-If you're not sure what to specify for altnet, comment it out and look for the igmpproxy output in the log (or on stdout if you start it in debug mode), it'll say something like ''Warn: The source address 10.254.16.66 for group 233.32.240.222, is not in any valid net for upstream VIF.'' and so you'll learn the multicast source address for your ISP.+If you're not sure what to specify for altnet, comment it out and look for the igmpproxy output in the log (or on stdout if you start it in debug mode - you can simply test by igmpproxy -d /etc/igmpproxy.conf), it'll say something like ''Warn: The source address 10.254.16.66 for group 233.32.240.222, is not in any valid net for upstream VIF.'' and so you'll learn the multicast source address for your ISP. 
 + 
 + 
 +=== Network interface settings === 
 + 
 +You need to enable IGMP snooping on your LAN interface: 
 + 
 +<code> 
 +config interface lan 
 +        option type bridge 
 +        option igmp_snooping 1 
 +        ... 
 +</code>
=== Firewall settings === === Firewall settings ===
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        option dest_ip  224.0.0.0/4         option dest_ip  224.0.0.0/4
        option target  ACCEPT         option target  ACCEPT
 +        option family  ipv4
</code> </code>
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</code> </code>
 +
 +=== Using igmpproxy and udpxy together ===
 +When using igmpproxy together with udpxy, firewall rules must be combined.  You need three firewall rules:
 +<code>
 +config rule
 +        option src      wan
 +        option proto    igmp
 +        option target  ACCEPT
 +config rule
 +        option src      wan
 +        option proto    udp
 +        option dest    lan
 +        option dest_ip  224.0.0.0/4
 +        option target  ACCEPT
 +config rule
 +        option src      wan
 +        option proto    udp
 +        option dest_ip  224.0.0.0/4
 +        option target  ACCEPT
 +</code>
==== Multicast forwading ==== ==== Multicast forwading ====
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This will forward all multicast packets to all ports on your bridge, making igmpproxy or udpxy unnecessary. In large networks, this may not be desirable. This will forward all multicast packets to all ports on your bridge, making igmpproxy or udpxy unnecessary. In large networks, this may not be desirable.
 +===== IPv6 ======
 +
 +IPv6 uses MLD see [[wp>Multicast_Listener_Discovery]]

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doc/howto/udp_multicast.1366433264.txt.bz2 · Last modified: 2013/04/20 06:47 by gatak