I have found sometimes that with the netgear router that it will assign the same IP to two machines. (One machine is in standby mode. The netgear router will think its disconnected and reassign the IP to a newly logon computer but the other machine will still respond to the ip traffic)
But practice is to assign IP address to each work station.
Assign Server Ip
IP 192.168.0.100
Subnet 255.255.255.0
Gateway 192.168.0.1 Router (some routers use 192.168.1.1 check manual)
Primary DNS enter server IP
Secondary DNS 4.2.2.2 (or reouter IP)
Computer 1-10
IP 192.168.0.5 (6,7,8....)
subnet 255.255.255.0
Gateway 192.168.0.1
Primary DNS 192.169.0.100
Secondary DBS 4.2.2.2
Do this will stop double assinged IP address and speed up logon.
GL
Brian