Re: [Devil-Linux-discuss] Antw: Multicast Routing does not work - newstatus

[Gerhard O. <ger...@gm...>]

Just trying to clarify previous post. Multicasting routing does not
work as unicast routing. This works a little different, depending if
you use NAT or not.
  No NAT involved: Use IGMP router like zebra, pimd, mrouted, xorp
  NAT: Requires setting up routes manually (use for instance smcroute)
or an IGMP Proxy
(http://www.ietf.org/internet-drafts/draft-ietf-magma-igmp-proxy-06.txt)

Unfortunately, there are no good IGMP proxy available for *nix. There
should be some in closed projects, but I did not find much when
investigating a year and a half ago. I did find one hidden in the open
source embedded linux Texas Instruments routers. I have adapted this
IGMPproxy to work with normal linux kernels. There are some
limitations with this, I tried adapting pimd to make a proper
solution. However, I lost access to the test object before I could
finish. There are a little info here (I have modified pimd a little
since this):
http://hem.bredband.net/b382880/igmp

Note: you also need to modify the firewall. Some hints, using Shorewall:
http://lists.shorewall.net/pipermail/shorewall-users/2004-August/014266.html
http://lists.shorewall.net/pipermail/shorewall-users/2005-January/016793.html

-- 
Gerhard
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