A Server, 2 nics, 2 subnets, why can the router supply dhcp to the 2nd subnet?

Question

I had a server i was working on, sms 2000, so it had 2 nics and each nic was on a different subnet.

The router was set to supply dhcp.in the range 192.168.1.100 --->192.168.1.150

Now i didn't check any settings in the server i.e, dns dhcp etc....so i don't know how it was setup. Also i am still a bit amateur at the whole thing.

The router was plugged direct into the server("WAN nic") and the server plugged into the switch("LAN nic") and obviously all the workstations plugged into the switch.

So the "wan nic" was set to auto assign an ip in tcp/ip settings, and was given an ip by the router of 192.168.1.100, dg=192.168.1.1.

The "LAN nic" was set a static ip in tcp/ip of 192.168.16.2, dg=192.168.1.1, dns = 192.168.1.1.

These are all the settings i know.

1) Does the dhcp on the router supply the 192.168.16.xxx subnet OR does the server do this OR has the server been configured so that the router can "get onto" the 192.168.16.xxx" subnet to supply it was dhcp ips becasuse as far as i know the router would need to have static or dynamic route knowledge, like RIP, to do this, or am i way off the mark.

Well now that i think about it the server must have configured to supply dhcp to the 192.168.16 subnet as the router dhcp is just working in 192.168.1 hmmmm

So how would dns have been setup for this, anyone come across this kind of setup?

Answer 1

Frame Relay will have been used, it allows for one DHCP server to assign addresses to clients on different subnets.

Answer 2

You can use 1 DHCP server for multiple subnets. This could be done by adding an ACL or Access Control List to the router that limits one of the subnet's access to the internal site. Or you could set up 2 Vlans on a switch and put the department that can access the site on one Vlan and the other department on another. -Dweebs On Duty

Answer 3

Remove the Router--seems useless to me and.Stop the DHCP service on the server is the simple quick solution, set up your 2 scopes on the switch, 1 for workstations the other for phones, printers and crap. Leave the static addresses on the servers alone-- you change them you loose access to your mail server, blackberry server, nas and app servers ect. because then it needs to be changed on all the workstation. If they are looking for xxx.xxx.16.1 for mail they wont find it if you change the address