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Created: 2022-02-04 | Last update: 2022-06-30

Disable IPv6 on Proxmox Permanently

By default, Proxmox IPv6 is enabled after installation. This means that the IPv6 stack is active and the host can communicate with other hosts on the same network via IPv6 protocol.

Output of ip addr command:

Default IPv6 Proxmox

You can disable IPv6 on Proxmox VE by editing the /etc/default/grub file.

nano /etc/default/grub

add ipv6.disable=1 to the end of GRUB_CMDLINE_LINUX_DEFAULT and GRUB_CMDLINE_LINUX line. Don't change the other values at those lines.

GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1"
GRUB_CMDLINE_LINUX="ipv6.disable=1"

The config should look like this:

Grub Configuration

Update the grub configuration.

update-grub

Save and exit. Reboot Proxmox Server to apply the changes.

Output of ip addr command after disabling IPv6 on Proxmox VE:

No IPv6 Proxmox Image

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