Re: [SAM] detect the presence of an IGMPv3 querier
Stig Venaas <stig@venaas.com> Fri, 20 May 2011 17:45 UTC
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Date: Fri, 20 May 2011 10:45:36 -0700
From: Stig Venaas <stig@venaas.com>
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Cc: sam@irtf.org
Subject: Re: [SAM] detect the presence of an IGMPv3 querier
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On 5/20/2011 4:36 AM, Sebastian Wölke wrote:
> Hi all,
>
> I'm working on a system software that automatically detects the presence
> of a multicast querier in the current subnet based on passively
> monitoring Linux kernel states.
>
> This works fine for IPv6/MLD by looking into the /proc/net/SNMP6 table.
> For IPv4/IGMP, the SNMP approach does not work. I can detect an IGMPv2
> querier by monitoring 'Timer' in the /proc/net/igmp table: this counts
> down the [Unsolicited Report Interval]. However, this does not exist for
> IGMPv3, as reports are not suppressed.
>
> My question is about IGMPv3. Does anybody know how to detect the
> presence of an IGMPv3 querier based on the kernel states of a multicast
> client?
If you look at "/proc/net/igmp" it should give you the querier version.
I see e.g.:
Idx Device : Count Querier Group Users Timer Reporter
1 lo : 0 V3
010000E0 1 0:00000000 0
2 eth0 : 3 V3
010000E0 1 0:00000000 0
Doesn't this work?
Stig
>
> Thanks for your support,
>
> Sebastian
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- [SAM] detect the presence of an IGMPv3 querier Sebastian Wölke
- Re: [SAM] detect the presence of an IGMPv3 querier Stig Venaas
- Re: [SAM] detect the presence of an IGMPv3 querier Sebastian Wölke
- Re: [SAM] detect the presence of an IGMPv3 querier Thomas C. Schmidt