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IPv6

When you create an instance in the Arvancloud Cloud Server, it is assigned an IPv4 address by default so that it can communicate with other servers or systems. In addition, all instances can use free IPv6, and you can add one to it during or after creating the instance.

By enabling IPv6 when creating an instance, its network interfaces are automatically configured and you can use it without the need for more manual settings. So, we suggest to use this option for faster setup and to prevent errors in the settings. However, you can enable IPv6 on existing instances in your account by manually configuring them after they are created.

Enabling IPv6 while Creating Instance​

You can create a server with the desired settings by following a few simple steps. After selecting the data center, operating system and the size of the instance and its disk, you can add an IP version 6 to your new instance in the "Advanced Settings" step and the "Network" tab.

Note that to activate IPv6, you must also keep the IPv4 address active.

After setting other options and final check, click on "Create new instance" button to create and launch the server.

When the server is created, you can see the IPv6 assigned to the server network in the "Instance List" and in the IP address section or by clicking on instance details. This IP does not need to be configured and is ready to connect.

Enabling IPv6 after Creating Instance​

If you already have an instance and you want to add IPv6 to it, you can click on the "Add Internet IP" button from the "Internet IP" section in the cloud server panel and select IPv6.

When you enable IPv6 on a prebuilt instance, you need to configure its network settings manually on the server. This setting disables automatic network configuration and adds information such as Server Name, Gateway Address, and IPv6 Address to the server.

To recieve the Gateway and Subnet address, in the cloud server panel refer to the "Network" section and then "Internet IP".

Connect to the server through instance console or SSH and change the settings based on your OS distribution:

Open /etc/netplan/50-cloud-init.yamland add the following lines to it:

network:
    version: 2
    ethernets:
        eth0:
            dhcp4: true
            mtu: 1500
            set-name: eth0
        eth1:
            accept-ra: false
            addresses:
            - {your_ipv6_and_subnet}
            mtu: 1500
            nameservers:
                addresses:
                - 2606:4700::1111
                - 2001:4860:4860::8888
            routes:
            -   to: ::/0
                via: {gateway_address}
            set-name: eth1

Then restart the network service:

sudo netplan apply

Checking IPv6 Connectivity​

note

To use IPv6, both sides of a connection must be able to send and receive IPv6 traffic. Since not all ISPs provide IPv6 addresses, you may not be able to connect to your instance's IPv6 address from your local system.

To check the IPv6 settings and connection, you can ping the Google IP version 6 from your instance:

ping6 2001:4860:4860::8888

If the settings have been applied correctly and IPv6 is working properly, you should get an output similar to the image below:

Disabling IPv6​

To disable IPv6, connect to the server via console or SSH and change the settings based on your OS distribution:

Open /etc/netplan/50-cloud-init.yaml and remove the following lines from it:

network:
    version: 2
    ethernets:
        eth0:
            dhcp4: true
            mtu: 1500
            set-name: eth0
        eth1:
            accept-ra: false
            addresses:
            - {your_ipv6_and_subnet}
            mtu: 1500
            nameservers:
                addresses:
                - 2606:4700::1111
                - 2001:4860:4860::8888
            routes:
            -   to: ::/0
                via: {gateway_address}
            set-name: eth1

Then restart the network service:

sudo netplan apply