Troubleshooting Dhcp Server Configuration; Symptom; Analysis; Solution - HP FlexNetwork MSR2003 Configuration Manual

[RouterA-dhcp-pool-0] option 43 hex 800B0000020102030402020202
# Associate DHCP user class ss with option group 1.
[RouterA-dhcp-pool-0] class ss option-group 1
Verifying the configuration
# Verify that Router B can obtain an IP address on subnet 10.1.1.0/24 and the corresponding PXE
server addresses from Router A. (Details not shown.)
# On the DHCP server, display the IP addresses assigned to the clients.
[RouterA] display dhcp server ip-in-use

Troubleshooting DHCP server configuration

Symptom

A client's IP address obtained from the DHCP server conflicts with another IP address.

Analysis

Another host on the subnet might have the same IP address.

Solution

1. Disable the client's network adapter or disconnect the client's network cable. Ping the IP
address of the client from another host to check whether there is a host using the same IP
address.
2. If a ping response is received, the IP address has been manually configured on a host. Execute
the dhcp server forbidden-ip command on the DHCP server to exclude the IP address from
dynamic allocation.
3. Enable the network adapter or connect the network cable, release the IP address, and obtain
another one on the client. For example, to release the IP address and obtain another one on a
Windows XP DHCP client:
a. In Windows environment, execute the cmd command to enter the DOS environment.
b. Enter ipconfig /release to relinquish the IP address.
c. Enter ipconfig /renew to obtain another IP address.
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