AN Lesson-10

Troubleshooting DHCP

Q.Discuss how to verify the DHCP client configuration for troubleshooting?

Verifying the Client Configuration

• One of the first signals of a DHCP failure appears either when a client loses connectivity to network resources or when a new client cannot establish such connectivity in the first place.
• In these cases, you need to determine whether the problem originates on the client or elsewhere.
• Begin by using the Ipconfig command to determine whether the DHCP client has received an address lease from the DHCP server. If so, the Ipconfig /all output shows that DHCP is enabled, and the IP address is described as an “IP Address” and not an “Autoconfiguration IP Address.”
• Alternatively, you can check the address type listed on the Support tab of the status dialog box for the connection.

Verifying address type

  

Address Conflicts

• If a client computer has been assigned an address in use by another computer on the network, a warning message informing you of this conflict appears in the system tray.
• You can also learn about such address conflicts in the System log, which you can access through Event Viewer.

 Failure to Obtain a DHCP Address

• When the Ipconfig /all command output or the connection status dialog box reveals that the client address is assigned by APIPA or by an alternate configuration, you can first attempt to refresh the IP configuration by using either the Ipconfig /renew command or the Repair button in the connection’s status dialog box.
• If the problem persists, this situation can signal either the absence of a DHCP server or relay agent deployed within broadcast range, a break in the physical connection, or an error at the DHCP server or scope.