Disable IPV6 cmd line how?

[brentr]

Can someone please share the easy cmd to disable IPV6 please, Thank you Have a good day!

[Trekkie00]

Test with ip a, if IPv6 is running. If yes and you want to disable it temporarily, use sudo sysctl -w net.ipv6.conf.all.disable_ipv6=1 to disable it for the current session. It will be back running after reboot. If you want to disable it generally, add the boot parameter disable.ipv6=1.

[cscs]

I may point out;

Disable IPv6 - IPv6 - ArchWiki

Which will suggest;

Prefer IPv4 over IPv6 - IPv6 - ArchWiki

And will add that in NetworkManager you can apply, ex;

/etc/NetworkManager/conf.d/prefer-ipv4-dns.conf

[connection]
ipv4.dns-priority=100
ipv6.dns-priority=200

To quote the docs;

DNS servers priority. The relative priority for DNS servers specified by this setting. A lower numerical value is better (higher priority). Negative values have the special effect of excluding other configurations with a greater numerical priority value; so in presence of at least one negative priority, only DNS servers from connections with the lowest priority value will be used. To avoid all DNS leaks, set the priority of the profile that should be used to the most negative value of all active connections profiles. Zero selects a globally configured default value. If the latter is missing or zero too, it defaults to 50 for VPNs (including WireGuard) and 100 for other connections. Note that the priority is to order DNS settings for multiple active connections. It does not disambiguate multiple DNS servers within the same connection profile.

[brentr]

This is and IDEAL solution! Thank you very much and have a good day!! I will use this. I had disabled IP 6 on my DHCP router but this idea is so much better. Thank You!! Is this adding a new file or editing the exising one? Thanks in Advance.

[brentr]

Sorry to sound lazy I searched and discovered it is a new file and created it. Right ON for you Excellent Solution! Thanks Again

[cscs]

In case it was missed it might be pointed out that the ArchWiki link above outlines a separate suggestion to the NM one written here.
It may be desirable to apply both preferences.

PS.

You were correct that the example prefer-ipv4-dns.conf file would need to be created.
The /etc/gai.conf suggested in the ArchWiki should already exist.