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Reassigning port 22 to another number won't work. Port scanners (and a PCI audit) will find it anyway. It is the concept of security through obscurity, which won't stop any of the hardcore hackers.
port 22 for all IPs except your own is much better, because even if hackers manage to get your password or certificate you use to authenticate yourself,
I agree, it is just I implore both. However sometimes when on the go with my laptop I have to disable to IP stuff so I can get in from my hotel or the beach
Reassigning port 22 to another number