3Com Switch 8800 Configuration Guide Chapter 13 DHCP Configuration
13-18
the DHCP server receives no response after sending all these packets, it considers the
IP address is not used by other devices in this network and assigns the IP address to
this DHCP client. Otherwise, it does not assign the IP address.
Perform the following configuration in system view.
Table 13-29 Configure parameters for DHCP server to send ping packets
Operation Command
Set the maximum number of ping
packets the DHCP is allowed to send dhcp server ping packets number
Revert to the default maximum number undo dhcp server ping packets
Set the maximum duration for the DHCP
server to wait for response to a ping
packet dhcp server ping timeout milliseconds
Revert to the default maximum duration undo dhcp server ping timeout
By default, the DHCP server sends up to 2 ping packets to test an IP address and waits
for a response for up to 500 milliseconds before it sends another ping packet.
Note that the DHCP server detects address conflict by ping packets, whereas a DHCP
client does this by ARP packets.
13.3.12 Displaying and Debugging the DHCP Server
After the above configuration, yYou can execute the display command in any view to
display operating information about the DHCP server to verify your configuration, and
execute the debugging command to enable debugging for the DHCP server
Execute the following command in any view.
Table 13-30 Display the configuration information about the DHCP server
Operation Command
Display the statistics about DHCP
address conflicts display dhcp server conflict { all | ip
ip-address }
Display information about lease-expired
addresses in DHCP address pool(s).
The lease-expired IP addresses in an
address pool are assigned to other
DHCP clients as needed if the address
pool runs out of its available IP
addresses
display dhcp server expired { ip
ip-address | pool [ pool-name ] |
interface [ vlan-interface vlan_id ] | all }
Display the ranges of available
(unassigned) IP addresses in DHCP
address pools display dhcp server free-ip