IGMP forwarding between LANs

Hello!
I have a trouble using IPTV (over multicast UDP)
through a Linux router.

There are one workstation machine
and the server, connected to the ISP LAN.
Server has 2 NICs, link to the workstation is NIC-to-NIC.
Server routes normal (unicast) traffic
from workstation to Internet as NAT.
Server can join LAN's multicast groups (tested by emroute),
but IGMP requests to join these multicast groups
are ignored when come from the workstation.
No outcoming IGMP nor changes in /proc/net/igmp .
Multicast route is set to the ISP LAN.

I read in http://kerneltrap.org/node/6565
that I should set /proc/sys/net/ipv4/conf/*/mc_forwarding to 1,
but we can see in the filesystem (and in the kernel source)
that such /proc objects are READ ONLY.

Linux/2.4.33-pre3, relevant .config options follow:
CONFIG_INET=y
CONFIG_IP_MULTICAST=y
CONFIG_IP_ADVANCED_ROUTER=y
CONFIG_IP_MULTIPLE_TABLES=y
CONFIG_IP_ROUTE_FWMARK=y
CONFIG_IP_ROUTE_NAT=y
# CONFIG_IP_ROUTE_MULTIPATH is not set
CONFIG_IP_ROUTE_TOS=y
CONFIG_IP_ROUTE_VERBOSE=y
# CONFIG_IP_PNP is not set
CONFIG_NET_IPIP=m
CONFIG_NET_IPGRE=m
CONFIG_NET_IPGRE_BROADCAST=y
CONFIG_IP_MROUTE=y
CONFIG_IP_PIMSM_V1=y
CONFIG_IP_PIMSM_V2=y
# CONFIG_ARPD is not set
# CONFIG_INET_ECN is not set
# CONFIG_SYN_COOKIES is not set



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I realized (thanks to http://technet2.microsoft.com/Window...1d65e1033.mspx
that the thing I need is an "IGMP proxy",
it's a multicast analog of NAT, isn't it?

Is there some simple soft for IGMP proxy for Linux?
I tried igmpv3proxy http://potiron.loria.fr/projects/mad...i/igmpv3proxy/
, but it compiled with a lot of warnings and doens't work,
say "setsockopt IP_MSFILTER: Cannot assign requested address" when receive an IGMP packet.

A *simple* IGMP proxy is required, no need in MBone, DVMRP etc.
I have only one downstream host.

Maybe there are some kernel patches solving the problem?



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Innocenti Maresin wrote:
> I realized (thanks to http://technet2.microsoft.com/Window...1d65e1033.mspx
> that the thing I need is an "IGMP proxy",
> it's a multicast analog of NAT, isn't it?
>
> Is there some simple soft for IGMP proxy for Linux?
> I tried igmpv3proxy http://potiron.loria.fr/projects/mad...i/igmpv3proxy/
> , but it compiled with a lot of warnings and doens't work,
> say "setsockopt IP_MSFILTER: Cannot assign requested address" when receive an IGMP packet.
>
> A *simple* IGMP proxy is required, no need in MBone, DVMRP etc.
> I have only one downstream host.
>
> Maybe there are some kernel patches solving the problem?
>

Not a proxy but you can set up static routes and issue joins with
smcroute - it compiles and "works" on 2.6.12 & 16. Trouble is I don't
think things work at my ISP so I don't really know if it works yet.

http://www.cschill.de/smcroute

Andy.

Andy Furniss:
>
> http://www.cschill.de/smcroute

Thank you, smcroute can do this job.
I can't use yet subnetmasks instead of the list of individual IPs,
but it's really a minor problem IMHO.


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