Ubiquiti’s or UI’s GPONs do not have a SSH client by default. Or do they?

If you type “ssh” and hit return, you’ll receive a “not found” error.

Typically on devices like home routers, GPONs, UniFi AP’s etc, ssh is handled by Dropbear. Dropbear provides a Secure Shell compatible server and client and is typically used in embedded systems.

To SSH from a GPON to another device, use dbclient

dbclient ubnt@192.168.1.20

dbclient is the Dropbear client. AKA, SSH client.