You should create a ssh tunnel between the 2 serves. Then you can connect from the WP with only the mysql server ip.
ssh -f [email protected] -L 2000:personal-server.com:25 -N
The -f tells ssh to go into the background just before it executes the command.
This is followed by the username and server you are logging into.
The -L 2000:personal-server.com:25 is in the form of -L local-port:host:remote-port.
Finally the -N instructs OpenSSH to not execute a command on the remote system.
via Revsys
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