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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?

kittygirl
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    These messages indicate you blocked IPv6 in your firewall, not disabled it. – Michael Hampton Jul 13 '21 at 16:48
  • @MichaelHampton,I disable ipv6,by reference of https://unix.stackexchange.com/questions/402217/disabling-ipv6-on-mint-and-debian – kittygirl Jul 14 '21 at 04:16
  • @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 – A.B Jul 14 '21 at 06:46
  • @A.B,Should I add `net.ipv6.conf.enp0s31f6.disable_ipv6 = 1`?I didn't find this in reference post. – kittygirl Jul 15 '21 at 10:42
  • 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. – A.B Jul 15 '21 at 12:22

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