I have two vps's at vps.net and there working like a charm I have 1 external interfaces with a public ip and 1 internal interface with a private ip-addresse on each server. I have the DB on the server with ISPConfig 3.0.1.6 and i want to other server to access the db, but i dont want to open up the firewall on the external interface to mysql, because i see this as a security problem. Where can i type in some iptable-rules so that they are static?