Windows Server 2012R2 DHCP function exception

Question

Hi

I noticed I have a problem with my DHCP service, which based on Windows Server 2012 R2. The problem is that the address rental information for the scope 172.25.40.0 is much less than the actual terminal, and there are many bad address.

I checked the Microsoft logs of the Dhcp server and did not see any relevant records.Why are there fewer entries in the address lease table and no related log records?

Answer 1

Hi A

here are a few possible explanations and troubleshooting steps to consider:

Lease Duration:

• Verify the lease duration set for the DHCP scope. If the lease duration is too short, it could result in frequent lease expirations and fewer entries in the address lease table. Adjust the lease duration to a longer period if necessary.

IP Address Exhaustion:

• Check if you have enough available IP addresses within the DHCP scope to accommodate all the terminals. If the IP address pool is exhausted, it can lead to fewer entries in the address lease table. Consider expanding the scope or adjusting the subnet to allow for more IP addresses.

Rogue DHCP Server or IP Conflicts:

• Ensure that there are no rogue DHCP servers on the network. A rogue DHCP server could be assigning IP addresses, causing conflicts, and resulting in fewer lease entries in the DHCP server's address lease table. Use network scanning tools to identify any unauthorized DHCP servers and eliminate them.
• Check for IP address conflicts. If multiple devices have the same IP address, it can cause lease failures and lead to fewer entries in the lease table. Resolve any IP conflicts by ensuring each device has a unique IP address.

DHCP Server Failures:

• Check the DHCP server's event logs for any critical or error messages that could indicate service disruptions or failures. Restart the DHCP service or the server itself if necessary.

Logging Configuration:

• Confirm that the DHCP server logging is properly configured. In the DHCP server properties, check if the "Enable DHCP audit logging" option is enabled. Adjust the logging level if needed to capture relevant events in the logs.

1. DHCP Server Monitoring Tools:

• Consider using third-party DHCP server monitoring tools that provide more comprehensive logging and monitoring capabilities. These tools can offer more insights into DHCP lease activity and help identify any issues or anomalies.