Bug 40782

Summary: Bridge module drops multicast frames (in Xen only?)
Product: Networking Reporter: Dmitry Khromov (da3m0n)
Component: OtherAssignee: Arnaldo Carvalho de Melo (acme)
Status: RESOLVED INVALID    
Severity: normal    
Priority: P1    
Hardware: x86-64   
OS: Linux   
Kernel Version: 3.0.1 Subsystem:
Regression: No Bisected commit-id:
Attachments: Output illustrating the issue
Environment (dom0)

Description Dmitry Khromov 2011-08-10 00:48:40 UTC
Created attachment 68262 [details]
Output illustrating the issue

Trying to send multicast frames designated to networks other than 224.0.0.0/24 will result in frames being dropped on the bridge. Tested with bridge created in Xen 4.1.1 Dom0. Output illustrating the issue attached.
Comment 1 Dmitry Khromov 2011-08-10 11:03:29 UTC
Created attachment 68312 [details]
Environment (dom0)
Comment 2 Dmitry Khromov 2011-08-10 12:38:22 UTC
Buggy equipment malformed IGMP traffic on it's way to eth1 so the bridge module was not aware of the other multicast groups members, that's why the traffic wasn't forwarded.
That was hard to investigate (everything worked just fine on the same switch's port before we changed the server), sorry for any inconvenience.