Can not ssh into server over ivp6 address
reddit / selfhosted

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IgnisDa · 2023-11-29 15:56

I provisioned a machine on Hetzner Cloud. All default settings except
Networking where I chose **ONLY** IPv6. Added an SSH key too.

When I try to connect over ssh, I get the following error:

https://imgur.com/a/mx1hzCU

The public address given by hetzner was `2a01:4ff:1f0:c2f8::/64`, but
I saw online that I have to replace the `/64` with `1`.

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InfamousAgency6784 · 2023-11-29 16:32

1. You need to make sure you have IPv6 access to the internet from
your computer.
2. In properly configured Linux boxes, your suffix might not be `::1`.

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IgnisDa · 2023-11-29 16:43

Thanks, you are right. I updated my post.

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certuna · 2023-11-29 17:31

`2a01:4ff:1f0:c2f8::/64` is the whole subnet, your server will have
one (or more) addresses in that subnet. This *could* be
2a01:4ff:1f0:c2f8::1, but could also be a randomly generated suffix.

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nat64dns64 · 2023-11-29 22:21

1. Your client needs to be IPv6-enabled
2. Your client needs to be able to reach the target server via tcp/22

All this presumes that your sshd is even listening on IPv6...

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IgnisDa · 2023-11-29 23:39

I did use the Hetzner console to login into the server and enabled
ListenAddress ::.

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nat64dns64 · 2023-11-30 16:25

The /etc/ssh/sshd\_config file usually controls that, and the required
line is either:

for IPv4 + IPv6:

AddressFamily any

or for IPv6 only:

AddressFamily inet6

After changing that, you'll need to reload/restart the sshd.