Generate key

ssh-keygen -t ed25519

Write config

Create a file named config inside ~/.ssh and add the following.

Host <server-name>
 Hostname <ip>
 User <username>
 IdentityFile <path-to-private-key>

Now you can log in to your server easily with ssh <server-name> instead of having to type ssh -i <path-to-private-key> <username>@<Hostname>

Fix disconnection on idle

Client will keep sending null packets every 100 seconds to keep the connection alive. Add

ServerAliveInterval 100

to either

sudo vi /etc/ssh/ssh_config


vi ~/.ssh/config

Alternatively, you can do ssh -o ServerAliveInterval=100 me@remote

Reverse Port Forwading

Add these lines to /etc/ssh/sshd_config on your server

GatewayPorts clientspecified
AllowTcpForwarding yes

Then open the terminal on your local computer, paste the following and change the values suitably

ssh -o ExitOnForwardFailure=yes -v -N -R "*:$SERVER_PORT:*:$CLIENT_PORT" server_name

R = Specifies that connections to the given TCP port or Unix socket on the remote (server) host are to be forwarded to the local side.
N = Do not execute a remote command, in simple words, do not log in to the server.
v = Verbose mode. Causes ssh to print debugging messages about its progress.

server_name is either username@ip or server name that you configured on your ~/.ssh/config
If you want to bind to only IPv4 addresses, use instead of *

If there is frequent disconnection, follow this to fix it.