Omar Shamali
العربية

IPv6 Reverse DNS Setup and SSH Connect

Author: Omar Shamali
Writing Date:

This tutorial assumes you already rented a server with IPv6, and you are facing problems reaching it via SSH. Also we are demonstrating views from Hetzner.

How to Configure IPv6 and Connect via SSH

Step 1: Generate Reverse DNS (rDNS) Record

Go to https://www.whatsmydns.net/reverse-dns-generator

Place your IPv6 and click convert with ::1 at the end of it

whats-my-dns-generate-ip6-rdns-png

Step 2: Configure Reverse DNS (rDNS)

You need to configure the reverse DNS record (rDNS), by making sure that it has the final part, for example: XXX:XXX:XXX:XXX:XXX::(here), to be XXX:XXX:XXX:XXX:XXX::1

In Hetzner cloud, we choose network, from the 3 dots button next to IPv6, we choose "Edit Reverse DNS"

reverse-dns-hetzner-ipv6-png

 

In the new window, fill in the first field ::1, and the generated rDNS obtained from step 1, then click "Edit Reverse DNS"

edit-rdns-hetzner-cloud-png

Step 3: Connect via SSH

By default, Hetzner enables remote SSH, you can check that following one of the tutorials online, so to connect to this new IPv6 cloud/server, open a new terminal, and write:

ssh -6 root@XXXX:XXX:XX:XXX:XX::1

Issues Not Reaching

  1. If you are facing reach out issue, you might need to use a VPN that has fast DNS updates, such as CloudFlare VPN
  2. Make sure the SSH port 22 is open and public on your server

Testing environment:

Cloud: Linux CentOS Stream 9

Terminal: Mac OS Terminal