[LARTC] Multicast Routing

[LARTC] Multicast Routing

[Badrul Anuar]

Anybody can answer my question regarding multicast routing.

i have read Linux 2.4 Advanced Routing HOWTO and i have some
question about multicast routing.

I have two network to route between. Can you give me some tips to
configure the routing table.

I have two LAN connecting each other through Linux Box.
Box A
eth0 : internet Add
eth1 : local subnet (192.168.0.0)

Box B
eth0 : 192.168.0.15
eth1 : 10.100.0.1

Client C (windows 98) connect to Box B is 10.100.0.10

How can my Client C can send multicast packet to LAN connected to BOX A and
B in the same time (sending from client C 10.100.0.10)?I
use IP Masquerade to make sure my "Client C" can connected directly to
internet. same as i use it at BOX A and B.

I can send multicast packet from Client C to Box B, and Box B to Box A. But
can't send from Client C to Box A. Box A can
send multicast packet to Box B  but can't send to Client C.

I think may be i have to configure the multicast routing at BOX B. But I
have tried many ways but failed.

Thank you.

ps: sorry for the bad english language.



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[LARTC] Multicast routing

[Meenakshi Kaushik]

Hello list,
   Not sure if I am asking the question in the correct list. I am a 
newbie trying
to get multicast routing to work on my linux 2.4 kernel. I am using
usc pimd code. I have pimd which sets up the route in the kernel

[ /tmp]# ip mroute show
(22.22.22.1, 224.0.1.20)         Iif: eth2       Oifs: eth1
[ /tmp]#

I can see data packets arriving on eth2

[/tmp]# tethereal -i eth2
Capturing on eth2
  0.000000   22.22.22.1 -> 224.0.1.20   UDP Source port: 32770  
Destination port: 12345
  1.000000   22.22.22.1 -> 224.0.1.20   UDP Source port: 32770  
Destination port: 12345
  2.000000   22.22.22.1 -> 224.0.1.20   UDP Source port: 32770  
Destination port: 12345
 
However, packets  are not getting forwarded on eth1

[ /tmp]# cat /proc/net/ip_mr_cache
Group    Origin   Iif     Pkts    Bytes    Wrong Oifs
140100E0 01161616 2         82    84788        0  1:1 
[mkaushik@ooty2 /tmp]#



[ /tmp]# cat /proc/sys/net/ipv4/ip_forward
1

Any suggestions on debugging the problem is greatly appreciated

Thanks
Meenakshi






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[LARTC] Multicast Routing

[Alan Ford]

Hi,

Anybody know anything about multicast routing? :)  I see the HOWTO is
rather lacking in this area...

On my home network, I have multiple subnets attached to my router. I'd
like multicast packets on either interface to be distributed on the
other interface.

(For context, this is to get Apple's Rendezvous protocol to work across
multiple subnets).

I thought this should be simple with multicast, but I can find zero
documentation on it. The HOWTO cuts off just before the useful bit!
Could anybody please shed any light?

many thanks,
-- 
Alan Ford * alan@whirlnet.co.uk 
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[LARTC] Multicast routing

[Sachin K]

How do the Multicast routers sniff IGMP/MLD messages from the network?

I checked the XORP, pimd etc. Most of them just open a RAW socket with
protocol set to IPPROTO_IGMP. But using this the router gets the
packets addressed to 224.0.0.1 only.

How does it receive IGMPv2 and IGMPv3 membership reports sent by other hosts?

Thanks,
Sachin
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