The gateway is one of those IP addresses. The device has both a ISP address interface (WAN) and a LAN interface (eth0 or somesuch). The router (gateway) routes the ISP network to the LAN network. So if we take your setup we would have this
Originally Posted by avaserver
Once again the ISP address is on the WAN side of the router. Kind of like this
188.xx.xxx.208 - Network ID # this is the ID number of this subnet)
188.xx.xxx.209 - Gateway (router LAN side Ethernet IP address)
188.xx.xxx.210 - Server1
188.xx.xxx.211 - Server2
188.xx.xxx.212 - Server3
188.xx.xxx.213 - Server4
188.xx.xxx.214 - Server5
188.xx.xxx.215 - Broadcast IP
You need a router. You can't use a hub or plain switch. A hub or switch only understands Ethernet. The WAN to LAN connection works with TCP/IP to route the packets. This is not a connection like a phone. This is multi layered packet switched internetworking.
| ISP controlled
------------------------ <- This is the router
| 188.xx.xxx.209 <-- The Gateway!
LAN side (your network)