Hi, Firstly, I apologize for my bad English. May I know, what the different between DNS Server and install Bind on the server? I've installed ISPConfig without problem and right now, I want to use it with my own DNS which I can set it on my client domain name server later. Example: ns1.mydomain.com ns2.mydomain.com So, my question is, do I need 2 different IP in my single server or 2 different server? If I can set it on my single server, is there any command for me to use? I'm using DigitalOcean, but there is no subscription for buying other IP.