Networking, switches, DNS, DHCP
We have a currently a Tiger server connected to a gigabit switch, all other computers also connect to the same switch which is connected to a router/ISDN modem from our ISP. We have 30 static IP adresses which we assign to each computer (by hand). We bought the upgrade to Leopard server and want to change all this to isolate some of the computers (but not all of them). I was reading about making the server as a gateway and creating a subnet in which most computers on our network could connect and receive their DNS, IP, etc, from DHCP. My problem is how will I enable the other computers that will keep their current IP adress from our ISP to communicate with our subnet? Will they see each other in bonjour? Will they have access to all services like the new iCal server, wikis, ichat server, the printers inside that subnet?
On another front, if I want to test this without buying another switch, can I hookup the new server directly to the router/ISDN modem which has 4ports for LAN and connect it to en0, then connect en1 to the same switch that operates our current network. Would that cause any problem?
With the new server, how do I setup DNS in the advance mode, Do I give it my ISP's DNS? I did register an IP adress and got a domain name, but we're not going to do our own mail server, so do I realy need a DNS service running on my server?
That's a lot of question, sorry, but any help would be very appreciated!
TIA
Jeff
Mac Pro 3.0 8 core, Mac OS X (10.5.2), 16Gb RAM