openssh unix dev - Mar 2024 - ProxyJump does not accept IPv6 for the intermediate host?

Hello,

it seems I cannot use:

$ ssh -J root at 2a01:4f8:1c1e:528d::1 root at west-coast
Invalid -J argument

(The west-coast is stored on the jump host in between in /etc/hosts.)

$ ssh -J root at 167.235.141.44 root at west-coast

Works as expected. Also 

$ ssh root at 2a01:4f8:1c1e:528d::1

does work as expected. I do have native IPv6.

This is on Debian 12 Bookworm:
$ ssh -V
OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023

The workaround seems to be to define the host used in ProxyJump in
~/.ssh/config then it works with IPv6 too.

Yes, I known I should use IPv6 with DNS which is not the point here.

What have I overlooked?

Thank you for any help.

Adam Kalisz

On Wed, 2024-03-13 at 12:19 +0100, Adam Kalisz wrote:
> Hello,
> 
> it seems I cannot use:
> 
> $ ssh -J root at 2a01:4f8:1c1e:528d::1 root at west-coast
> Invalid -J argument
> 
$ ssh -J root@[2a01:4f8:1c1e:528d::1] root at west-coast

would work for me. 

greeting
Bj?rn

On 2024/03/13 12:19, Adam Kalisz wrote:
> Hello,
> 
> it seems I cannot use:
> 
> $ ssh -J root at 2a01:4f8:1c1e:528d::1 root at west-coast
> Invalid -J argument
> 
> (The west-coast is stored on the jump host in between in /etc/hosts.)
> 
> $ ssh -J root at 167.235.141.44 root at west-coast
> 
> Works as expected. Also 
> 
> $ ssh root at 2a01:4f8:1c1e:528d::1
> 
> does work as expected. I do have native IPv6.
> 
> This is on Debian 12 Bookworm:
> $ ssh -V
> OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023
> 
> The workaround seems to be to define the host used in ProxyJump in
> ~/.ssh/config then it works with IPv6 too.
> 
> Yes, I known I should use IPv6 with DNS which is not the point here.
> 
> What have I overlooked?
$ ssh -J root@[2a01:4f8:1c1e:528d::1] root at west-coast