(usagi-users 03382) Re: MLDv2 linux implementation questions

Hoerdt Mickael <[email protected]> wrote on 06/13/2005 08:31:58 
AM:

> Hi,

> I am doing some tests on the MLDv2 linux implementation (2.6.11 kernel).
> I have two questions :

> - How do I check the MLD version running on my host ?

        As a user, or in a shell script, an easy way is to see if
/proc/net/mcfilter6 exists (it will if MLDv2 is supported on the
machine, won't otherwise). In a program, you can use one of the
source filter socket options and you'll get errno ENOPROTOOPT if
it isn't implemented.
 
> 
> On a link with MLDv2, I am joining and leaving the same SSM channel  and
> I am checking
> the status of /proc/net/igmp6 to see the state if has effectively
> joined/leaved the
> channel here is the ouput :

        These fields are unchanged from MLDv1, except the addition of a 
flag.
The '0x10' portion is MAF_GSQUERY, the "0x6" part is "MAF_LOADED" (on the
device) and "MAF_LASTREPORTER" (on the link). A "1" is "timer running".
        MAF_GSQUERY means there is a pending group and source specific
query for that group.
        If you wanted to look at the filter list, that's in the mcfilter6
file I mentioned earlier.
        The 4th field in igmp6 is the time left on the pending timer. It 
all
looks like expected behaviour to me-- is there something specific that
concerned you?

                                                +-DLS