In this problem your device are not able to reach DHCP server.Make sure that You have connected your AP to your ADSL router with a LAN cable between LAN port on ADSL to LAN port on AP is correct or not.
Multiple reasons for nor working:
- LAN an AP has different IP address range than you have on ADSL router this will mean no data from ADSL will go to AP that’s what DHCP requests are getting dropped and devices are not receiving IP address.
- DHCP on ADSL is restricted too.
- IP address of ADSL and AP are same.
- Right way to connect them will be connect LAN cable from one of LAN ports of ADSL to WAN port of AP, here make sure that ADSL and AP have different network IP address, another thing you make sure that DHCP is running on ADSL and also on AP.
Wi-Fi protected access:
Greater security is provided with Wi-Fi access to allow identify D-Link wifi extender setup users based on s clandestine changes automatically at regular interval, here used in aggregation with a radius server WPA services Temporal key integrity procedure (TKIP) to change chronological key every 10,000 packets protects better safety than normal WEP security here requires the keys to be changed physically. Here are the steps that can help you in installing a new dlink wireless extender which is DAP-1520.
Easy migration to higher bandwidth:
Upholding compatibility with existing wireless network gear upgrade to a higher speed at the pace you want the other 802.11g standard device can D-Link wifi extender setup slowly at the network, D-LINK is verification for guard against network interruption used in combination with RADIUS server purpose provides a means verify the identity of client before access to the network is granted, includes an embedded DHCP server that enables will automatically assign IP addresses to wireless clients.