Configuring IPv6 on a Hosthatch VPS

bulbasaur

I've been trying to configure IPv6 on a Hosthatch VPS running Ubuntu 20.04, but to no avail.

Their support is not the best and tried to give me standard documentation about netplan when I tried asking them, followed by gateway settings that don't work. The "reconfigure networking" is broken and places a IPv4 only /etc/network/interfaces file even when an IPv6 address has been added through their panel

Here's the configuration that I have:

network:
  version: 2
  renderer: networkd
  ethernets:
    ens3:
      accept-ra: no
      addresses:
        - 153.92.127.xxx/24
        - 2a01:6f0:ffff:xxxx::xxxx/64
      gateway4: 153.92.127.1
      gateway6: 2a01:6f0:ffff::1
      nameservers:
        addresses:
          - 8.8.8.8
          - 8.8.4.4

The configuration seems like it should work but here's what happens when I try to connect to a IPv6 host:

$ curl -v6 ipv6.icanhazip.com
*   Trying 2606:4700:10::ac43:98a:80...
* TCP_NODELAY set
* Immediate connect fail for 2606:4700:10::ac43:98a: Network is unreachable
*   Trying 2606:4700:10::6816:13bc:80...
* TCP_NODELAY set
* Immediate connect fail for 2606:4700:10::6816:13bc: Network is unreachable
*   Trying 2606:4700:10::6816:12bc:80...
* TCP_NODELAY set
* Immediate connect fail for 2606:4700:10::6816:12bc: Network is unreachable
* Closing connection 0
curl: (7) Couldn't connect to server

Has anyone managed to get IPv6 working? If so, please let me know how you got it working?

codelock

First you have assign a random ipv6 address from subnet they alloted you in the control pannel, then reboot server
Then edit etc/network/interfaces to look like

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address redacted
gateway redacted
netmask 255.255.255.0
dns-nameservers 8.8.8.8 8.8.4.4
iface eth0 inet6 static
address ipaddressyouassigned
netmask 48
gateway gatewayipasseenincontrolpannel

Be sure to set netmask as 48

Restart networking or reboot

Sorry for formatting on Mobile

didog

Add a IPv6 nameserver, maybe.

yoursunny

@stevewatson301 said:
Here's the configuration that I have:

network:
  ethernets:
    ens3:
      addresses:
        - 2a01:6f0:ffff:xxxx::xxxx/64
      gateway6: 2a01:6f0:ffff::1

gateway6 must be in the same subnet as one of the addresses.
If it's not, you must specify the gateway using routes key with on-link: true.
How to Select Default IPv6 Source Address for Outbound Traffic with Netplan has an example.

Also, be careful writing "ens3" as Interface name.
See Disabling VNC in Virtualizor ⇒ Lost Connectivity? for a case when it caused trouble.

bulbasaur

@yoursunny said: gateway6 must be in the same subnet as one of the addresses.

@codelock said: Be sure to set netmask as 48

Thanks, this was my issue. The entire subnet had to be used (/48), I had confused it with the subnet assigned to me (/64). Once I updated it to /48, I had IPv6 working.

DP

yoursunny

@thedp said:

Enlarging the subnet from /64 to /48 could cause reachability problems with other addresses in the same /48 subnet.
This depends on router and ebtables configuration.

bulbasaur

@thedp said:

Blame that on my poor eyesight, I could swear that there was no "show configuration details" button on their panel