Some DHCP Issues

Symptoms: 1. You can see wireless, but can’t access.
2. The clients are waiting for releasing an IP address.
3. You may receive IP conflict message.

Case 1:  Some wireless devices can get IP from the DHCP but others. The DHCP statistics show 0% available and it is out of the IP addresses.

Resolution: 1. Added more IP addresses.
2. Cut the IP address release time.

Case 2: There are two DHCP in the same subnet and IP without exclusive settings.

Case 3: On the DHCP server, we can see some bad address. Even I have deleted all bad addresses, but they will come back. Using ARP and Mac address to problematic device. Finally it points to an AP that hold many IP addresses and don't release them. That causes IP conflict and bad address issues. We fix it by rebooting the AP. Please refer to this pages: AP problem after adding Cisco WLC V7 to a network and How to Enable or Disable DHCP Proxy in Cisco WLC V7:

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