Keep Ubuntu ssh connected for a long time

The SSH connection under Ubuntu is always broken, and if you ignore it for a while, you will lose your response.
How to make SSH connection server or SSH tunnel to stay connected?
In fact, it is very convenient, as long as the/etc/ssh/ssh_config file two parameters in the line
1 tcpkeepalive Yes
2 Serveraliveinterval 300
The previous parameter says to keep the connection, the latter parameter indicates that every 5 minutes sends a packet to the server that says "I'm alive."
If you do not have root privileges, it is also possible to modify or create ~/.ssh/ssh_config

Keep Ubuntu ssh connected for a long time