I am not sure how you have your server issuing static IP addresses. That sounds like DHCP to me. Just make the router the DHCP server and have it assign all IPs, or you could set the server’s IP static and put it in the DHCP excluded list on the router and keep the router DHCP.
Question is hazy.
IPCONFIG and ROUTE (in command windows, or the client side) will be your friends.
Note: Specifying IP settings on the client side overrides whatever the DHCP server will send.
Illustration Only! If this is all you need to know, great. But this is to illustrate what needs to be worked out.
What is your design goal? Maybe things like:
1. Clients need to talk to the server and to the router
2. Server should NOT connect to Internet
3. Server’s implementation of DHCP is required because it assigns IP features the router doesn’t”.
4. But you liked the router’s DHCP, because it was delivering DNS server settings that enabled you to resolve URLs.
In which case, you want to
1. Remove all static settings from clients.
2. Configure the router to NOT assign addresses, but make note of the DNS servers it had been assigning (or other trustworthy DNS servers you want to use) and the static address that you will use to reach the router.
3a. You want the clients to have a route to the small number of addresses that includes the server (and perhaps the other clients).
3b. You want the clients to have a route to all other addresses, and the route (gateway) to those addresses is the router.
3c. You want the clients to be able to be able to resolve the server’s name (and optionally the other clients and optionally register its own name).
3d. You want the clients to be all to resolve other names.
On your DNS server, you’ll already seen where to specify multiple DNS servers, right? Prefer you local DNS server, but include one or more of the DNS servers the router would have supply.
You’ve already specified a default route. It should be the route for your DNS server’s scope ONLY. Add a new route for everything else, and its gateway (router) should be the IP address for your wireless router.