From a server, it goes to DB router to two rooms via switch and one access point in between these two rooms. Now, i want to have internet access only in DB Router and i want only intranet access in access point. How to do that? Is there any option i access point? Please help me guys.
More about :disabling internet access access point
hmmm the Access Point would have to be the DHCP server for those devices that connect to it, in it's DHCP config the AP should give no default gateway at all, this way those devices would be in the same network so LAN would work but without a default gateway (nor DNS servers) they won't be able to access the internet.
Bear in mind this will work until someone connected will realize the problem is lack of gateway and DNS, if they know how to setup it manually they'll still be able to access to internet, there's where access lists would be a definite solution if you can apply them in your DB router.
A AP is only a stupid switch when it comes to passing traffic. There is no way on a consumer grade AP to limit lan traffic. The only place you can limit traffic is on a router. The only way you can likely accomplish this is to put in mac filters in the router to no allow certain machines access to the internet.