Hi,

I am facing a problem while testing existing IGMP Snooping feature support in Linux Kernel 2.6.39.4 version.

Test Setup :

I have made a Test Setup with 3 Linux Machines namely, "Linux bridge", "machine-A" and "machine-B". Linux bridge machine has 2 ethernet interfaces and "machine-A" and "machine-B" have 1 ethernet interface each.

Linux bridge's one of the interface is connected to the machine-A (configured as a host).
Linux bridge's second interface is connected to the machine-B (configured as a host).

Configured Linux bridge using Bridge utilities (brctl) and added two interfaces to the bridge.

Test Observation :

1. machine-A sends join/report packet to Linux bridge.
2. Linux bridge's wireshark : I noticed that the Linux bridge received the igmp join/report packet, and this is also forwarded to machine-B.

Expected Test Result :

As per IGMP Snooping functionality, we expect that the machine-B SHOULD not receive the join/reports (As machine-B is not configured as multicast router).

Clarifications :

1. Does Linux Kernel 2.6.39 support IGMP Snooping feature to some extent ?

2. If yes to the Q1, then I would like to know what all features of IGMP Snooping are supported by Linux Kernel 2.6.39 ?

3. Please clarify if the expected test result as mentioned above for our test scenario is correct or not or we are missing something completely in our configuration.

Thanks & Regards,
Gagan

The kernel 2.6.39 should support IGMP snooping. Do you configure it?

Hi,

Yes, I had configured the Kernel to support IGMP Snooping. The file /boot/.config shows me that this feature has been selected.

Regards,
Gagan

Hi,

Does it work for you ? Have you tested IGMP Snooping with Linux Kernel 2.6.39 or higher versions ? Please let me know.

Regards,
Gagan

"netstat -g" or cat /proc/net/igmp will give you group membership information.