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[kernel] since 4.6.0 igmp_max_memberships is 0 (solved)
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letchideslandes
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PostPosted: Mon Jun 06, 2016 11:24 am    Post subject: [kernel] since 4.6.0 igmp_max_memberships is 0 (solved) Reply with quote

Since the update of the 4.6.0 kernel, I can not join a multicast group.

Could you pass the value of
Code:
less /proc/sys/net/ipv4/igmp_max_memberships


I can compare with my value is 0

with kernel 4.5.3 this value is 20

my bug report was kicked but on kernel newbie i can read

Code:
IGMP: Add namespaces support for the following sysctls: igmp_llm_reports commit, igmp_max_memberships commit, igmp_max_msf commit, igmp_qrv commit


so something has changed, but i can't find where.

Thanks


Last edited by letchideslandes on Mon Jun 06, 2016 7:55 pm; edited 1 time in total
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poncho
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Joined: 06 Mar 2011
Posts: 88

PostPosted: Mon Jun 06, 2016 4:18 pm    Post subject: Reply with quote

I've commented on the bug. I can reproduce this issue. I think the bugreport should be reopened...
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limn
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PostPosted: Mon Jun 06, 2016 6:02 pm    Post subject: Reply with quote

Code:
$ uname -r
4.6.1-gentoo
$ cat /proc/sys/net/ipv4/igmp_max_memberships
20


Which bug? This bug?

I'm having a problem with both 4.6.0 and 4.6.1 and rsync which appears to be ipv4 related.
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poncho
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PostPosted: Mon Jun 06, 2016 6:44 pm    Post subject: Reply with quote

limn wrote:
Which bug? This bug?


https://bugs.gentoo.org/show_bug.cgi?id=584536
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limn
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PostPosted: Mon Jun 06, 2016 7:35 pm    Post subject: Reply with quote

Thank you for providing the link. A search for igmp_max_memberships results in Zarro Boogs found.

OP may want to try gentoo-sources-4.6.1.
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poncho
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PostPosted: Mon Jun 06, 2016 7:37 pm    Post subject: Reply with quote

limn wrote:
A search for igmp_max_memberships results in Zarro Boogs found.


you need to search for
Code:
ALL igmp_max_memberships
to find closed bugs as well ;)
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letchideslandes
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PostPosted: Mon Jun 06, 2016 7:55 pm    Post subject: Reply with quote

Yep,

you must now have

Code:
CONFIG_IP_MULTICAST to true


to join a multicast group. First time i activate this option. This "bug" is solved for me. Thanks for help.
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