Troubleshooting Dhcp Server Configuration - 3Com MSR 50 Series Configuration Manual

588 C 33: DHCP S
HAPTER
Troubleshooting DHCP
Server Configuration
C
ERVER ONFIGURATION
# Enable DHCP.
<RouterA> system-view
[RouterA] dhcp enable
# Configure DHCP address pool 0.
[RouterA] dhcp server ip-pool 0
[RouterA-dhcp-pool-0] network 10.1.1.0 mask 255.255.255.0
[RouterA-dhcp-pool-0] option 43 hex 80 0B 00 00 02 01 02 03 04 02 02 02 02
Symptom
A client's IP address obtained from the DHCP server conflicts with another IP
address.
Analysis
A host on the subnet may have the same IP address.
Solution
1 Disconnect the client's network cable and ping the client's IP address on another
host with a long timeout time 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 the
host. Execute the dhcp server forbidden-ip command on the DHCP server to
exclude the IP address from dynamic allocation.
3 Connect the client's network cable. Release the IP address and obtain another one
on the client. Take WINDOW XP as an example, run cmd to enter into DOS
window. Type ipconfig/release to relinquish the IP address and then
ipconfig/renew to obtain another IP address.