How do I disable IPv6?

You cannot disable a Rcs.is’s IPv6 interface using the Rcs.is Control Panel after the Rcs.is has been activated. However, you can disable it by making changes to its network interface configuration.

Alternatively, you can also block all IPv6 traffic to the Rcs.is using a cloud firewall rule.

Prerequisites

Altering network configurations can cause you to lose access to your Rcs.is or other problems. We recommend taking a snapshot of the Rcs.is before making any changes to its network configuration. You can use the snapshot to rebuild the Rcs.is to the state it was in at the time when you took the snapshot.

Update Network Interface

Select your Rcs.is’s OS from the tabs below and follow the instructions to disable its IPv6 address.

Ubuntu and Debian
Fedora
CentOS, AlmaLinux, and Rocky Linux

To disable the IPv6 address for your Ubuntu or Debian Rcs.is, open the /etc/netplan/50-cloud-init.yaml file using nano or your preferred text editor:

nano /etc/netplan/50-cloud-init.yaml

The 50-cloud-init.yaml file contains all of the configuration information for the Rcs.is’s network interfaces. Comment out the Rcs.is’s IPv6 address in the addresses field of the eth0 interface:

network:
    version: 2
    ethernets:
        eth0:
            accept-ra: false
            addresses:
#            - 2001:DB8:1:1::7/64
            - 203.0.113.7/24
            - 198.51.100.12/24

Next, run the following command to apply the updated configuration.

netplan apply

To disable the IPv6 address for your Fedora Rcs.is, open the /etc/NetworkManager/system-connections/cloud-init-eth0.nmconnection file using vi or your preferred text editor:

vi /etc/NetworkManager/system-connections/cloud-init-eth0.nmconnection

Note

vi opens files in a read-only mode by default. To edit a file in vi, switch to insert mode by pressing the i key.

Once you are done editing the file, press the Esc key to exit insert mode. Then type :wq and press Enter to save and quit the file.

The cloud-init-eth0.nmconnection file contains all of the configuration information for the Rcs.is’s eth0 network interface. Under the [ipv6] section, comment out the address1 and route1 fields in the file, as shown below:

[ipv6]
method=auto
may-fail=true
# address1=2001:DB8:1:1::7/64
# route1=::/0,2001:DB8:1:1::1

To disable the IPv6 address for your CentOS Rcs.is, open the /etc/sysconfig/network-scripts/ifcfg-eth0 file using vi or your preferred text editor:

vi /etc/sysconfig/network-scripts/ifcfg-eth0

Note

vi opens files in a read-only mode by default. To edit a file in vi, switch to insert mode by pressing the i key.

Once you are done editing the file, press the Esc key to exit insert mode. Then type :wq and press Enter to save and quit the file.

The /etc/sysconfig/network-scripts/ifcfg-eth0 file contains all of the configuration information for the Rcs.is’s eth0 network interface. Comment out the IPV6ADDR field containing the Rcs.is’s IPv6 address, as shown below:

AUTOCONNECT_PRIORITY=120
BOOTPROTO=none
DEFROUTE=yes
DEVICE=eth0
GATEWAY=203.0.113.1
HWADDR=6a:b0:bc:ae:73:1c
IPADDR=203.0.113.7
IPADDR1=198.51.100.11
# IPV6ADDR=2001:DB8:1:1::7/64
IPV6INIT=yes
IPV6_AUTOCONF=no
IPV6_DEFAULTGW=2001:DB8:1:1::1
IPV6_FORCE_ACCEPT_RA=no
MTU=1500
NETMASK=255.255.255.0
NETMASK1=255.255.255.0
ONBOOT=yes
TYPE=Ethernet
USERCTL=no

After disabling IPv6, save the file and close it. To implement the changes, reboot the Rcs.is:

reboot

Log back into your Rcs.is to ensure the Rcs.is has restarted successfully and is accessible.

Then, run the following command from another machine, such as your local machine’s terminal, to confirm that IPv6 address is not responding.

ping6 <your-droplet-ipv6-address>

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