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WebPanel => CentOS-WebPanel GUI => Topic started by: anandmys on April 25, 2025, 05:28:17 AM

Title: NetworkManager errors / warnings
Post by: anandmys on April 25, 2025, 05:28:17 AM

Quote

Apr 25 00:22:01 hosting NetworkManager[676]:   [1745558521.6932] platform-linux: do-add-ip6-address[2: fe80::250:56ff:fe40:f5e8]: failure 13 (Permission denied)
Apr 25 00:22:03 hosting NetworkManager[676]:   [1745558523.6955] ipv6ll[7815b866a956efe0,ifindex=2]: changed: no IPv6 link local address to retry after Duplicate Address Detection failures (back off)
Apr 25 00:22:03 hosting NetworkManager[676]:   [1745558523.6958] platform: (eth0) route-sync: failure to add IPv6 route: type unicast fe80::1/128 dev 2 metric 100 mss 0 rt-src user: Permission denied
Apr 25 00:22:13 hosting NetworkManager[676]:   [1745558533.7064] platform-linux: do-add-ip6-address[2: fe80::250:56ff:fe40:f5e8]: failure 13 (Permission denied)
Apr 25 00:22:15 hosting NetworkManager[676]:   [1745558535.7089] ipv6ll[7815b866a956efe0,ifindex=2]: changed: no IPv6 link local address to retry after Duplicate Address Detection failures (back off)
Apr 25 00:22:15 hosting NetworkManager[676]:   [1745558535.7093] platform: (eth0) route-sync: failure to add IPv6 route: type unicast fe80::1/128 dev 2 metric 100 mss 0 rt-src user: Permission denied

Apache log file shows these lines. Should I ignore or should I fix this?

Title: Re: NetworkManager errors / warnings
Post by: overseer on April 25, 2025, 10:50:30 AM

If unused, consider disabling IPv6 to simplify your network stack (I have):
https://webhostinggeeks.com/howto/disable-ipv6-on-redhat-centos-6-centos-7/ (https://webhostinggeeks.com/howto/disable-ipv6-on-redhat-centos-6-centos-7/)

Title: Re: NetworkManager errors / warnings
Post by: anandmys on April 25, 2025, 12:17:39 PM

IPV6 is already disabled in kernel

Should it be disabled in networkmanager?

Title: Re: NetworkManager errors / warnings
Post by: overseer on April 25, 2025, 09:55:18 PM

If it's disabled in the kernel, there shouldn't be anything left to do (after rebooting). Can you show the results of

Code: [Select]

ip a  | grep net6

Title: Re: NetworkManager errors / warnings
Post by: Starburst on April 27, 2025, 01:09:48 PM

If you don't want IPv6 and are using AlmaLinux, you can use nmtui and disable it.

Title: Re: NetworkManager errors / warnings
Post by: anandmys on April 28, 2025, 12:32:14 PM

Quote from: overseer on April 25, 2025, 09:55:18 PM

If it's disabled in the kernel, there shouldn't be anything left to do (after rebooting). Can you show the results of

Code: [Select]

ip a  | grep net6

[root@hosting ~]# ip a  | grep net6
[root@hosting ~]# ip a  | grep net6

Title: Re: NetworkManager errors / warnings
Post by: anandmys on April 28, 2025, 12:38:34 PM

Quote from: Starburst on April 27, 2025, 01:09:48 PM

If you don't want IPv6 and are using AlmaLinux, you can use nmtui and disable it.

#nmcli connection show

NAME         UUID                                  TYPE      DEVICE
System eth0  3521111a-4fxx-43xx-x444-1xxxxxxxxx0  ethernet  eth0

# nmcli connection modify System ipv6.method "disabled"
Error: unknown connection 'System'.

What is the connection name I should use?

Title: Re: NetworkManager errors / warnings
Post by: anandmys on April 28, 2025, 12:44:45 PM

Quote from: Starburst on April 27, 2025, 01:09:48 PM

If you don't want IPv6 and are using AlmaLinux, you can use nmtui and disable it.

#nmcli conn show "System eth0"
connection.id:                          System eth0

# nmcli connection modify "System eth0" ipv6.method "disabled"
Error: Failed to modify connection 'System eth0': ipv6.addresses: this property                                                                              is not allowed for 'method=disabled'

Title: Re: NetworkManager errors / warnings
Post by: overseer on April 28, 2025, 12:46:57 PM

It wouldn't appear that IPv6 is enabled on your system, but you can double check here:

Code: [Select]

sysctl -a | grep -i ipv6
nmtui is a semi-graphical utility, so the procedure is not just a single command but a series of steps.
Invoke nmtui with sudo in a root shell: nmtui
Click on Edit a connection.
Select the interface you want to edit (eth0).
Go to IPv6 with the arrow keys on the keyboard.
Then select Disabled and click OK.
Run the ip a command from the terminal to confirm that IPv6 is no longer available.