How to disable IPv4 on OVZ?

Ruriko

How do you disable ipv4 on ovz container ubuntu 22.04? I just want to make it ipv6 only but I don't want to remove ipv4 permanently since I may need it to use it for downloading updates.

yoursunny

ip -4 addr flush

Ruriko

@yoursunny said:
ip -4 addr flush

how do I add back ipv4?

Mumbly

Check your network settings and save them before flush may be the easiest way :P

kevinds

@Ruriko said:
How do you disable ipv4 on ovz container ubuntu 22.04? I just want to make it ipv6 only but I don't want to remove ipv4 permanently since I may need it to use it for downloading updates.

I would advise not doing that... 127.0.0.0/8 is used for a lot of things.

Mumbly

Again ... network settings.
Open with editor /etc/network/interfacesor wherever are your networking settings, remove IP and restart network service /etc/init.d/networking restart

Ruriko

@kevinds said: I would advise not doing that... 127.0.0.0/8 is used for a lot of things.

well if you know other solutions to hide ipv4 when browsing the internet, I'm happy to hear them cause I run squid proxy server

kevinds

@Ruriko said: well if you know other solutions to hide ipv4 when browsing the internet, I'm happy to hear them cause I run squid proxy server

If that is your goal, just remove the IPv4 gateways.

Ruriko

How do I make these changes permanent? cause the settings reset when I reboot

kevinds

@Ruriko said:
How do I make these changes permanent? cause the settings reset when I reboot

Edit the network config file..

asterisk14

Tell host to unplug ethernet cables

greenhost_cloud

@Ruriko said:
How do you disable ipv4 on ovz container ubuntu 22.04? I just want to make it ipv6 only but I don't want to remove ipv4 permanently since I may need it to use it for downloading updates.

Edit the file /etc/sysctl.conf and add the line "net.ipv4.conf.all.disable_ipv4=1". Then run the command "sudo sysctl -p" to apply the change.

cochon

@Ruriko said:

@kevinds said: I would advise not doing that... 127.0.0.0/8 is used for a lot of things.

well if you know other solutions to hide ipv4 when browsing the internet, I'm happy to hear them cause I run squid proxy server

Is that just to prevent unwanted clients connecting to the proxy? or to hide your identity? Surely a chunk of the internet you want to access is still IPv4 only and you won't be able to connect to that.

Configuring acls in squid.conf to disallow IPv4 connections would seem far less extreme.

kevinds

@greenhost_cloud said:
Edit the file /etc/sysctl.conf and add the line "net.ipv4.conf.all.disable_ipv4=1". Then run the command "sudo sysctl -p" to apply the change.

Again, I would advise against doing that.. A lot of internal processes use 127.0.0.0/8 and localhost as whatever non loopback IP is on the system.

totally_not_banned

@kevinds said:

@greenhost_cloud said:
Edit the file /etc/sysctl.conf and add the line "net.ipv4.conf.all.disable_ipv4=1". Then run the command "sudo sysctl -p" to apply the change.

Again, I would advise against doing that.. A lot of internal processes use 127.0.0.0/8 and localhost as whatever non loopback IP is on the system.

Yeah, doing that for ipv6 is pretty safe as nothing is really written to assume it's presence but with v4 id be a little more cautious. Expect to not get a lot of useful logs (if there'll be any at all) when something "realizes" (or really 100% unexpectedly sees some syscall fail) that it can't bind to 127.0.0.1 and/or friends.