To keep backward compatibility with devices configured to use SSHv1, SSH legacy mode was introduced as an option in the ARM600's SSH-VPN settings. When SSH legacy mode is enabled, ARM600 uses the last version of OpenSSH with SSHv1 support included in the CentOS Linux distribution for all SSH-VPN and SSH Patrol connections. This means that if the SSH legacy mode is active, no updates are applied to the OpenSSH server responsible for SSH-VPN and SSH Patrol connections. When the legacy mode is disabled, an up-to-date OpenSSH version is used for all SSH connections. The legacy mode does not affect the SSH console access on port 10022 of ARM600.
- Updating any SSH-VPN peers using SSH protocol version 1 to use protocol version 2
- Disabling the SSH legacy mode in ARM600
In Arctic wireless devices, SSH protocol version 2 is used when the private and public keys used for authentication are set to SSH2 RSA keys.