How can I disable IPv6 or use temporary addresses. Regular methods don't work. [SOLVED]

[nurdle]

I've tried various methods. None work.

 

What are the recommended Armbian ways to
a) enable IPv6 temporary addresses

b) disable IPv6

 

Thank you.

[sfx2000]

I suppose one could go into network manager and set ipv6 to link-local only, this will result in your device getting an fe80::/64 address - which is handy for mDNS/Avahi on the local subnet...

 

[nurdle]

It wont let me save that setting.

I get:

Quote

Unable to save connection:
ipv6.addresses: this property is not
allowed for 'method=link-local'

 

[nurdle]

After hours, literally *hours*, researching this IPv6 crud I think I have it.

Apparently Network Manager overrides the regular IPv6 settings configured in `/etc/sysctl.conf`.

So its a two part fix.

 

First setting `method` to `ignore` is part of the solution (see sfx2000's screenshot)

That takes IPv6 out of Network Manager's control.
BUT `nmtui` wouldn't let me save that setting... I've no idea why.
So I had to do it manually

    sudo nano /etc/NetworkManager/system-connections/eth0
    ---[snip]---
    
    [IPv6]
    method=ignore

 

Then all the regular `/etc/sysctl.conf` changes seem to work.
I've tested Privacy extensions and disabling IPv6.

Hope this saves someone else wasting hours of their life they'll never get back

[sfx2000]

Looks like armbian-config might solve this....

 

Be root or user with sudo access....

 

 

[nurdle]

Thanks, sfx2000.  But I'd already "disabled" IPv6 using that method.
On my first Armbian setup attempts, no matter what I did, my system never got an IPv4 address.
It only ever had an IPv6 (despite my network being IPv4.)
Eventually I stumbled on that `armbian-config` option.

Once "disabled" it allowed the system to get an IPv4.  But despite what it says, it didn't "disable" IPv6 system wide.
Tools like `ip addr` and `ifconfig` showed it still had IPv6 active.