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IPv6: MLD: clamping QRV from 1 to 2!
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rsnfunky
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Joined: 30 Dec 2007
Posts: 63

PostPosted: Sun Jan 15, 2023 3:32 am    Post subject: IPv6: MLD: clamping QRV from 1 to 2! Reply with quote

Getting the above message in dmesg. The system is full of it.

I donot use IPV6 so could not understand the reason for this error. Can you help in resolving it?
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rab0171610
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Joined: 24 Dec 2022
Posts: 292

PostPosted: Sun Jan 15, 2023 3:42 am    Post subject: Reply with quote

Try adding
Code:
net.ipv6.mld_qrv=1

to /etc/sysctl.conf. If the file does not exist, create it. Reboot. Then check to see if the messages have disappeared.
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rsnfunky
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PostPosted: Sun Jan 15, 2023 3:46 am    Post subject: Reply with quote

I am using rc-update and not sysctl.

Where in the rc-update does one add this?
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rab0171610
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PostPosted: Sun Jan 15, 2023 3:51 am    Post subject: Reply with quote

Sorry for the confusion. Try what I said and reboot and report back here the results. It has nothing to do with Openrc or systemd. For example, notice the output on your machine of:
Code:
sysctl -a

You do not need to post it here. You may notice a line like:
Code:
net.ipv6.mld_qrv = 2

What I want to know is if setting this to 1 as I suggested fixes the problem with dmesg.
EDIT:
If you compile your own kernel and do not need the functionality you can try to disable these 2 items in your kernel:
Code:
 Networking Support>Networking Options>
<M> 802.1d Ethernet Bridging                                                         │ │ 
  │ │              [*]   IGMP/MLD snooping

To see if A) it solves your problem and B) if you have any adverse side effects.
If you use genkernel or another pre-compiled kernel, then your options are to modify the sysctl.conf file as I suggest or as a last resort, using the same file, disable IPv6 entirely. I will not go into the details now.
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