Multicast routing between two subnets

Linux Advanced Routing and Traffic Control

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Hello.

I’m new to this list.

 

I’m trying to set up multicast routing between two networks:

 

 

  Internet

                              ^

                              |

                         Windows box

                              |

                              |

UserModeLinux A <-----> Colinux Router    <-----> UserModeLinux B

                        running mrouter

 

 

I’m using a 2.6.8 kernel on Colinux with Multicast/Multicast routing support activated.

The UMLs are supporting Multicast.

 

I’m trying to make A and B communicate over a Multicast address with the emcast utility.

Mrouter on Colinux is receiving the membership report from A end B.

Mrouter is also filling the tables:

 

colinux:~# cat /proc/net/ip_mr_cache

Group    Origin   Iif     Pkts    Bytes    Wrong Oifs

080706E1 0114A8C0 2          3      117        0  1:1 

080706E1 010AA8C0 1          4      123        0  2:1

                                                   ^

                                                   |

                                          Output Interfaces

 

But nothing is forwarded:

colinux:~# cat /proc/net/ip_mr_vif  

Interface      BytesIn  PktsIn  BytesOut PktsOut Flags Local    Remote

 1 tap0            123       4         0       0 00000 FE0AA8C0 00000000

 2 tap1            117       3         0       0 00000 FE14A8C0 00000000

                                               ^

                                               |

                                          Nothing Out

 

I surely missed something but don’t know what.

I would be pleased if anybody could help...

Thanks in advance, Yoann

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