How to configure wireless router with DHCP?

[SYstemmm]

So my topology is:  DHCP server connected through cable to wireless router that connects to end clients(part of bigger topology). I configured DHCP server to work and wireless router to send IP's to LAN he is in. But I can't find a solution to make a DHCP server send an IP mask and gateway to a wireless router. I have wireless set to internet config DHCP. I can't use IP helper in this one, so I don't know what to do. Please help. 

[balaji.bandi]

What Wireless Router - ( or what AP model is this ? what mode ?

[SYstemmm]

WRT300N

[balaji.bandi]

ISP Router---WRT300N--users connect using wifi ? is this what you looking ?

may this guide help you :

https://setuprouter.com/router/linksys/wrt300n/login.htm

[SYstemmm]

What i don't know is how to get 

 this informations when wireless router is set to dhcp configuration from dhcp server(it can't send request to dhcp server by itself) so how do i send this info from dhcp server

[SYstemmm · Accepted solution]

Resolved: I made a stupid mistake of adding wrong IP on interface between DHCP and wireless and because of that DHCP pool didn't apply to it.