I'm not sure if this problem caused by Lubuntu or Cisco Router side.Lubuntu = 192.168.1.100 Cisco Router = 192.168.1.1SSH from Lubuntu to Cisco Routeruser@linux:~$ ssh -V OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n 7 Dec 2017 user@linux:~$ user@...