On Sat, Jul 15, 2023 at 11:59:33AM +0200, Roger Price wrote:
> I have three Debian machines on a 192.168.1/24 WiFi network. One is debian
> 11 and the two others are debian 9. The network is connected, I can ping
> from any machine to any other.
>
> The problem is that I can ssh from the debian 9's to the debian 11, but not
> to any debian 9, although all the machines can ssh to themselves:
>
> Some ascii art for people with fixed width fonts:
>
> .------OK--->-----debian 11--<--OK------.
> | .----<--FAIL---- titan----->--FAIL--. |
> | | | |
> | v v |
> debian 9---------FAIL--->------------debian 9
> maria ---------<---FAIL------------kananga
>
> # Debian 9 to debian 11: OK
> rprice@kananga:~$ ssh rprice@titan
> Linux titan 5.10.0-15-amd64 #1 SMP Debian 5.10.120-1 (2022-06-09) x86_64 ...
>
> # Debian 9 to debian 9: FAIL
> rprice@kananga:~$ ssh -v rprice@maria
> OpenSSH_7.4p1 Debian-10+deb9u2, OpenSSL 1.0.2l 25 May 2017
> debug1: Reading configuration data /etc/ssh/ssh_config
> debug1: /etc/ssh/ssh_config line 19: Applying options for *
> debug1: Connecting to maria [192.168.1.13] port 22.
> debug1: connect to address 192.168.1.13 port 22: Connection timed out
> ssh: connect to host maria port 22: Connection timed out
^^^^^^^^^
[...]
OK. We know routing is OK, we also know there's "no one" listening
at port 22 on maria (to the "outside", at least).
To sort out the possible things:
- log in to maria
- try "ssh rprice@localhost": what happens?
- if it works, there's an ssh daemon running on maria;
next to check would be
- is it listening on the external IP address?
- is there any firewall in front of it?
- if not, get an SSH daemon up and running on maria
(that's Debian package openssh-server)
Cheers
--
t
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