Is there a sort of 2nd SSH daemon server, sort of JAILKIT, in the debian repositories
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If I duplicate the bin of SSH into /usr/bin , maybe I could run 2 daemons.
the problem is that the config_sshd would be same
Duplicating binaries like that is not a SOP and mess up your system. It's also not necessary: the only thing you need is to 'umask 027; sed "s|^Port 22|Port 123456|g" /etc/ssh/sshd_config > /etc/ssh/sshd_config_123456; echo "alt-ssh 123456/tcp" >> /etc/services; echo "alt-ssh: 10.0.0." >> /etc/hosts.allow; iptables -A INPUT -p tcp -m tcp --dport 123456 -m state --state NEW -s 10.0.0.0/24 -j ACCEPT; sshd -f /etc/ssh/sshd_config_123456' to make it run on port TCP/123456, accessible to a 10.0.0.0/24 LAN.