6.0BETA3 panic in ip_output (vlan/RIP related?)

Robert Watson rwatson at FreeBSD.org
Tue Sep 6 09:00:46 PDT 2005

On Tue, 6 Sep 2005, Mark Tinguely wrote:

>> So it sounds like we need to figure out how the multicast code should 
>> behave on interface removal -- I wonder what other operating systems do 
>> here?  Do they simply invalidate current membership related with the 
>> interface, or do they leave the multicast sockets in a state such that 
>> if the interface comes back, the memberships are re-bound?
> In the case of a non-local multicast sessions, the saved multicast 
> socket state would need to keep a timestamp of the last a multicast 
> router IGMP session probe to detect the possibility of session pruning.

I was assuming that, at the very least, it would be necessary to issue a 
new IGMP join when binding the socket to a new interface...

Robert N M Watson

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