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[solved] dhcpcd-9.1.2 causing packet storm
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Ant P.
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PostPosted: Tue Jun 30, 2020 6:32 am    Post subject: [solved] dhcpcd-9.1.2 causing packet storm Reply with quote

Since a recent update when dhcpcd starts up this happens:
Code:
eth0: requesting DHCPv6 information
eth0: REPLY6 received from fe80::XXXX
eth0: refresh in 86400 seconds
eth0: rebinding prior DHCPv6 lease
eth0: DHCPv6 REPLY: No Addresses Available
eth0: REPLY6 received from fe80::XXXX
eth0: refresh in 86400 seconds
eth0: rebinding prior DHCPv6 lease
eth0: DHCPv6 REPLY: No Addresses Available
eth0: REPLY6 received from fe80::XXXX
eth0: refresh in 86400 seconds
eth0: rebinding prior DHCPv6 lease

These few lines repeat about 10 times per second until I kill the daemon, and the only rate limiting seems to be that it's CPU-bound.

Is there a way to disable DHCPv6 only while leaving ipv6ra enabled? My current workaround's simply to mask the broken version, but that won't last forever.


Last edited by Ant P. on Wed Jul 01, 2020 3:55 am; edited 1 time in total
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UberLord
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PostPosted: Tue Jun 30, 2020 10:59 pm    Post subject: Reply with quote

Until I can add a fix, you can add nodhcp6 to dhcpcd.conf
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Ant P.
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PostPosted: Wed Jul 01, 2020 3:54 am    Post subject: Reply with quote

Oh, thanks. No idea how I missed that...
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UberLord
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PostPosted: Wed Jul 01, 2020 6:30 pm    Post subject: Reply with quote

Could you post your dhcpcd.conf please?
This should only happen is NODELAY is set.
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UberLord
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PostPosted: Wed Jul 01, 2020 7:11 pm    Post subject: Reply with quote

Aha! I think I have this fixed here:
https://roy.marples.name/cgit/dhcpcd.git/commit/?id=0834ecd0a81ea7c6e2909fe4482c52c5494fbcc1
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Ant P.
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PostPosted: Wed Jul 01, 2020 8:28 pm    Post subject: Reply with quote

I did have nodelay set, but I can confirm that patch fixes it.
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UberLord
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PostPosted: Thu Jul 02, 2020 10:45 am    Post subject: Reply with quote

Great!

But why do you have nodelay set?
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