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Monitoring DHCP

A routing platform can operate as a DHCP server. To view information about dynamic and static DHCP leases, conflicts, pools, and statistics, select Monitor>DHCP in the J-Web interface or enter the following CLI commands:

In addition, you can display the globally configured DHCP settings by using the show system services global command from the CLI.

Table 33 summarizes the output fields in DHCP displays.

Table 33: Summary of DHCP Output Fields



Additional Information

DHCP Leases

Allocated Address

List of IP addresses the DHCP server has assigned to clients.


MAC Address

Corresponding media access control (MAC) address of the client.


Binding Type

Type of binding assigned to the client: dynamic or static.

DHCP servers can assign a dynamic binding from a pool of IP addresses or a static binding to one or more specific IP addresses.

Lease Expires

Date and time the lease expires, or never for leases that do not expire.

DHCP Conflicts

Detection Time

Date and time the client detected the conflict.


Detection Method

How the conflict was detected.

Only client-detected conflicts are displayed.


IP address where the conflict occurs.

The addresses in the conflicts list remain excluded until you use the clear system services dhcp conflict command to manually clear the list.

DHCP Pools

Pool Name

Subnet on which the IP address pool is defined.


Low Address

Lowest address in the IP address pool.


High Address

Highest address in the IP address pool.


Excluded Addresses

Addresses excluded from the address pool.

DHCP Statistics

Default lease time

Lease time assigned to clients that do not request a specific lease time.


Minimum lease time

Minimum time a client can retain an IP address lease on the server.


Maximum lease time

Maximum time a client can retain an IP address lease on the server.


Packets dropped

Total number of packets dropped and the number of packets dropped due to a particular condition.


Messages received

Number of BOOTREQUEST, DHCPDECLINE, DHCPDISCOVER, DHCPINFORM, DHCPRELEASE, and DHCPREQUEST messages sent from DHCP clients and received by the DHCP server.


Messages sent

Number of BOOTREPLY, DHCPACK, DHCPOFFER, and DHCPNAK messages sent from the DHCP server to DHCP clients.


For more information about the J-Web Monitor task, see Monitor Tasks.

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