[ubuntu] simple I.P addressing questions

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http://ubuntuforums.org – Hi there i'm wanting to build a network. The way i want to do it is to have a switch attached to my border router. my 2 servers will be on this switch. Also attached to this switch will be a dedicated firewall which will protect a few machines on my internal network. In building Internet firewalls(o'reilly) this is called a "screened subnet architecture". I was wandering about I.P addressing though. My border router allows static internal I.Ps but they all have to have the same network and subnet address. So the dedicated firewall can do dhcp and N.A.T for hosts on the internal netwo (HowTos)