1

I'm setting up SSH access to my own Git server and I've done some prerouting because SSH server is not listening on standard port because Git server is run by non-root user. This is the rule I currently have in my UFW's before.rules:

-A PREROUTING -p tcp --dport 22 -j REDIRECT --to-port 2222

It works well, but I have a little problem with it because I'm running VPN on same server and in case that I want to connect to some other SSH on different IP, this port is also redirected to 2222. I would only like that requests for my IP were prerouted from port 22 to 2222 and not also for other IPs. How should I change this rule to work with my IP even if I access my SSH server from the same machine (localhost, my IP)?

2

You can use -i to match the interface the packet was received on or -d to match the destination like so:

-A PREROUTING -p tcp --dport 22 -d <SERVER-IP> -j REDIRECT --to-port 2222

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