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1. This method is easy and will not add an extra layer of NAT to your network, but will eliminate all of your router's routing and firewall features:
Connect the DW6000 to a LAN port on the router. Connect all your computers and devices to LAN ports on the router. Leave the WAN port empty. Go into your router's configuration and disable its DHCP feature. Change the LAN IP of the router to be on the same sub-net the DW6000 is on so you can get back into the configuration screen again later if you need to. You will want to pick an IP that is not likely to be issued by the DW6000 to any other device on the network. 192.168.0.254 should work.
You router is now acting as a switch. All computers and devices on the network will get their IP's from the DW6000.
2. This method will preserve the router's routing and firewall features, but will add a second NAT layer to your network. Under most conditions, you will never notice a difference in performance anyway.
Connect the DW6000 to the WAN port of the router. Connect your network PC's and devices to the router's LAN ports. Go into the router configuration. Give the router a static WAN IP on the same subnet as the DW6000. 192.168.0.2 should work. Use 255.255.255.0 as the subnet mask. Enter 192.168.0.1 as the Default Gateway.
Now give the router an IP on a different sub-net for its LAN IP. 192.168.1.1 should work. Use 255.255.255.0 as the sub-net mask. If you are going to use your router to issue IP's on your network, set up its DHCP server to hand out IP's in the 192.168.1.2 - 192.168.1.254 range. The default gateway for LAN clients will be the router at 192.168.1.1. Use whatever DNS server(s) you like. 188.8.131.52 and 184.108.40.206 are two DirecWay DNS servers you can use. Set up each of your computers to obtain an IP address automatically.
If you are setting static IP's for the clients, put them in the 192.168.1.2 -192.168.1.254 range with the default gateway being 192.168.1.1 and an appropriate DNS server or two.
Or you can forego all of that and buy a switch. :-)
If your question has not been addressed in this FAQ, please ask your question in the forum.