#5640 Failed to activate interfaces : RTNETLINK answers: Operation not supported

[Stephen Cockburn]

I have 2 interfaces on the server ens18 and ens19

ens18 is IPv4 only and ens19 is IPv6 only: this is due to how my host provider provides IPv4 and IPv6 they have to be on their own interface.

I did have a problem that I reported and was fixed in version 2.101 ticket 5630 where the yaml file created was not correct.

Since that correction, I have been able to issue netplan apply the file that is created from Webmin's Network Configuration page and the yaml applies fine.

Also if I press the Apply Configuration button on the /net/ page that applies fine.

But if I select the adaptor or adaptors ens18 ens19 on the /net/list_ifcs.cgi page and select apply selected interfaces, I get the following error message: "Failed to activate interfaces : RTNETLINK answers: Operation not supported"

Any help to resolve this is much appreciated.

[Jamie Cameron]

Which Linux distribution and version are you running there?

Also, does the Apply button on the main page of the Network Configuration module work?

[Stephen Cockburn]

ubuntu 20.04 and as I said above the Apply button on the main page works as does a manual netplan apply at the console. I also get the same error message when I add an IP and use the SAVE and APPLY button.

[Jamie Cameron]

Can you attach a screenshot of the Activated at Boot tag on the Network Interfaces page from your system?

[Stephen Cockburn]

Activated at boot as requested

[Jamie Cameron]

Can you try applying this patch and then re-try activating the interface? https://github.com/webmin/webmin/commit/b095aa2b20309ad88417a569c1678d153e66fac1

It should show a more detailed error message now..

[Stephen Cockburn]

Done and got the following error message: Failed to activate interfaces : ip addr add dev ens19 failed : RTNETLINK answers: Operation not supported

Also ens18 which is IPv4 only applies fine, so I assume the error is happening because ens19 had no IPV4 address like I had with the previous netplan issue as mentioned in the first post. So I think its because ens19 is IPV6 only.

[Jamie Cameron]

Ok, that's useful! Try also applying this patch : https://github.com/webmin/webmin/commit/35bae257f24721c35ba5a114947edf58d391bb5e

[Stephen Cockburn]

Many thanks, that has fixed the problem, will the fix now be integrated into a future release?

[Jamie Cameron]

Yes it will. Thanks for reporting this!