Lots's of ` kernel: [ ] output chain dropped: IN= OUT=enp0s31f6 ` in `/var/log/messages`

kittygirl

11/13/22, 4:20 PM

I already disble ipv6 in mypc debian 10 system,firewall is nftable.
When I check /var/log/messages,lots of kernel: [ ] output chain dropped as below:

Jul 13 11:03:14 mypc kernel: [ 8206.745775] output chain dropped: IN= OUT=enp0s31f6 SRC=fe80:0000:0000:0000:cad3:ffff:fe6e:e23b DST=ff02:0000:0000:0000:0000:0000:0000:0002 LEN=48 TC=0 HOPLIMIT=255 FLOWLBL=248793 PROTO=ICMPv6 TYPE=133 CODE=0 UID=0 GID=0
Jul 13 11:03:18 mypc kernel: [ 8210.745624] output chain dropped: IN= OUT=enp0s31f6 SRC=fe80:0000:0000:0000:cad3:ffff:fe6e:e23b DST=ff02:0000:0000:0000:0000:0000:0000:0002 LEN=48 TC=0 HOPLIMIT=255 FLOWLBL=248793 PROTO=ICMPv6 TYPE=133 CODE=0 UID=0 GID=0
Jul 13 11:03:22 mypc kernel: [ 8214.745440] output chain dropped: IN= OUT=enp0s31f6 SRC=fe80:0000:0000:0000:cad3:ffff:fe6e:e23b DST=ff02:0000:0000:0000:0000:0000:0000:0002 LEN=48 TC=0 HOPLIMIT=255 FLOWLBL=248793 PROTO=ICMPv6 TYPE=133 CODE=0 UID=0 GID=0
Jul 13 11:03:26 mypc kernel: [ 8218.745303] output chain dropped: IN= OUT=enp0s31f6 SRC=fe80:0000:0000:0000:cad3:ffff:fe6e:e23b DST=ff02:0000:0000:0000:0000:0000:0000:0002 LEN=48 TC=0 HOPLIMIT=255 FLOWLBL=248793 PROTO=ICMPv6 TYPE=133 CODE=0 UID=0 GID=0
Jul 13 11:03:30 mypc kernel: [ 8222.745452] output chain dropped: IN= OUT=enp0s31f6 SRC=fe80:0000:0000:0000:cad3:ffff:fe6e:e23b DST=ff02:0000:0000:0000:0000:0000:0000:0002 LEN=48 TC=0 HOPLIMIT=255 FLOWLBL=248793 PROTO=ICMPv6 TYPE=133 CODE=0 UID=0 GID=0

My network didn't support ipv6,and I already disable ipv6 in debian.
What's the problem?

0 + 5

ubuntu

debian

iptables

kernel

nftables

Michael Hampton

11/13/22, 4:48 PM

These messages indicate you blocked IPv6 in your firewall, not disabled it.

kittygirl

11/14/22, 4:16 AM

@MichaelHampton,I disable ipv6,by reference of https://unix.stackexchange.com/questions/402217/disabling-ipv6-on-mint-and-debian

A.B

11/14/22, 6:46 AM

@kittygirl the link you provide should indeed have disabled IPv6, but your log shows that it's not disabled anyway. Probably one of your other system settings re-enabled it. You can verify with `/sbin/sysctl net.ipv6.conf.enp0s31f6.disable_ipv6` . 0 means *not* disabled

kittygirl

11/15/22, 10:42 AM

@A.B,Should I add `net.ipv6.conf.enp0s31f6.disable_ipv6 = 1`?I didn't find this in reference post.

A.B

11/15/22, 12:22 PM

My comment wasn't to solve anything, it was to verify where you're at. it should be typed exactly as I wrote it, and you should provide the result. I assume then that the result was `net.ipv6.conf.enp0s31f6.disable_ipv6 = 1` meaning that you *didn't* disable IPv6 even if you took steps to disable it (which failed at disabling it somehow) and it explains the logs.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Lots's of ` kernel: [ ] output chain dropped: IN= OUT=enp0s31f6 ` in `/var/log/messages`

TH: เคอร์เนลจำนวนมาก: [ ] เอาต์พุตเชนลดลง: IN= OUT=enp0s31f6 ` ใน `/var/log/messages`

RO: O mulțime de ` kernel: [ ] lanț de ieșire scăpat: IN= OUT=enp0s31f6 ` în `/var/log/messages`

RU: Много `ядро: [] цепочка вывода удалена: IN= OUT=enp0s31f6 `в `/var/log/messages`

VI: Rất nhiều chuỗi đầu ra ` kernel: [ ] bị rớt: IN= OUT=enp0s31f6 ` trong `/var/log/messages`

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