Troubleshooting A Dhcp Server - H3C S3600 Series Operation Manual

Operation Manual – DHCP
H3C S3600 Series Ethernet Switches-Release 1510
# Configure the IP addresses that are not dynamically assigned. (That is, the IP
addresses of the DNS server, WINS server, and gateways.)
[H3C] dhcp server forbidden-ip 10.1.1.2
[H3C] dhcp server forbidden-ip 10.1.1.4
[H3C] dhcp server forbidden-ip 10.1.1.126
[H3C] dhcp server forbidden-ip 10.1.1.254
# Configure DHCP address pool 0, including address range and DNS server address.
[H3C] dhcp server ip-pool 0
[H3C-dhcp-pool-0] network 10.1.1.0 mask 255.255.255.0
[H3C-dhcp-pool-0] domain-name aabbcc.com
[H3C-dhcp-pool-0] dns-list 10.1.1.2
[H3C-dhcp-pool-0] quit
# Configure DHCP address pool 1, including address range, gateway, and lease time.
[H3C] dhcp server ip-pool 1
[H3C-dhcp-pool-1] network 10.1.1.0 mask 255.255.255.128
[H3C-dhcp-pool-1] gateway-list 10.1.1.126
[H3C-dhcp-pool-1] expired day 10 hour 12
[H3C-dhcp-pool-1] quit
# Configure DHCP address pool 2, including address range, gateway, WINS server
address, and lease time.
[H3C] dhcp server ip-pool 2
[H3C-dhcp-pool-2] network 10.1.1.128 mask 255.255.255.128
[H3C-dhcp-pool-2] expired day 5
[H3C-dhcp-pool-2] nbns-list 10.1.1.4
[H3C-dhcp-pool-2] gateway-list 10.1.1.254

2.9 Troubleshooting a DHCP Server

I. Symptom
The IP address dynamically assigned by a DHCP server to a client conflicts with the IP
address of another host.
II. Analysis
With DHCP enabled, IP address conflicts are usually caused by IP addresses that are
manually configured on hosts.
III. Solution
Disconnect the DHCP client from the network and then check whether there is a
host using the conflicting IP address by performing ping operation on another host
Chapter 2 DHCP Server Configuration
2-33