Switch rebuild scripts are not working on Xenial due missing OpenSSH feature

[Márton Kiss]

Ubuntu 16.04 includes OpenSSH 7.2, which has depreciated DSA keys since verion 7.0. The ./base-switch-config.sh script cannot upload configuration to the MikroTik switch, because it throws a "no matching host key type found. Their offer: ssh-dss" error message, and scp / ssh commands are failing to connect to Miktrotik.

I suggest to add the -oHostKeyAlgorithms=+ssh-dss option to relevant ssh and scp commands.

[Vern Hart (vern)]

Adding the ssh command-line option to support dss is certainly one solution but RouterOS has supported rsa since version 6.31 which was released Aug 14, 2015

Perhaps a better solution would be to update RouterOS on the Mikrotik switch. This can be done by ensuring internet connectivity to the switch, visiting the router's IP in a web browser, and clicking Check for Updates.