Operation Manual – DHCP
H3C S5600 Series Ethernet Switches
Chapter 2 DHCP Server Configuration
2-40
[Sysname] radius scheme 123
[Sysname-radius-123] primary authentication 10.1.2.2
[Sysname-radius-123] primary accounting 10.1.2.2
[Sysname] domain 123
[Sysname-isp-123] scheme radius-scheme 123
[Sysname-isp-123] quit
# Create an address pool on the DHCP server.
[Sysname] dhcp server ip-pool test
[Sysname-dhcp-pool-test] network 10.1.1.0 mask 255.255.255.0
# Enable DHCP accounting.
[Sysname-dhcp-pool-test] accounting domain 123
2.11 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
z
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
on the network, with the conflicting IP address as the destination and an enough
timeout time.
z
The IP address is manually configured on a host if you receive a response packet
of the ping operation. You can then disable the IP address from being dynamically
assigned by using the dhcp server forbidden-ip command on the DHCP server.
z
Attach the DHCP client to the network, release the dynamically assigned IP
address and obtain an IP address again. For example, enter DOS by executing
the
cmd
command in Windows XP, and then release the IP address by executing
the
ipconfig/release
command. Then obtain an IP address again by executing
the
ipconfig/renew
command.
