Logging Dhcp Packet Information; Viewing And Deleting Dhcp Client Bindings - Juniper JUNOSE SOFTWARE 11.2.X - BROADBAND ACCESS CONFIGURATION GUIDE 7-20-2010 Configuration Manual

Logging DHCP Packet Information

Related Topics

Viewing and Deleting DHCP Client Bindings

Copyright © 2010, Juniper Networks, Inc.
The JunosE Software enables you to collect and log DHCP packet information for all
JunosE DHCP access models on a per-interface basis. To log packets for a specific DHCP
application, you enable DHCP packet logging on the interface that serves the application.
JunosE Software supports per-interface DHCP packet logging on a maximum of 16
interfaces. Per-interface DHCP packet logging is disabled by default.
You can specify which packets are logged—receive, transmit, or all. You can optionally
assign low or high priority to the logged packets. Packets are assigned a low priority by
default, which does not interfere with router DHCP packet processing. The logged packets
are output to the dhcpCapture event logging category.
You can configure per-interface DHCP packet logging on statically configured and
dynamically created IP interfaces. However, configuration information for dynamic
interface configurations is lost after a cold restart. Both static and dynamic interface
configuration information is maintained after a warm restart.
You use the ip dhcp-capture command with the following keywords to enable DHCP
packet logging for all DHCP applications on the interface.
Use the receive, transmit, and all keywords to specify the type of DHCP packets that
is logged.
Use the optional priority keyword to assign a low or high priority to logged packets. By
default, logged packets have a low priority and do not interfere with the router's DHCP
packet processing.
You can specify DHCP packet logging on a maximum of 16 interfaces.
To enable DHCP packet logging:
host1(config-if)#ip dhcp-capture all
ip dhcp-capture
The JunosE Software provides commands that enable you to manage your router's DHCP
external server, DHCP local server, and DHCP relay proxy client bindings. A client binding
associates an IP address with a DHCP client, and describes both the client (for example,
hardware address and state) and the IP address (for example, subnet and lease time).
The following commands enable you to view information about current DHCP client
bindings:
To display information and track lease times and status for specified DHCP client
bindings, with results arranged in ascending order by binding ID, use the show dhcp
binding command.
Chapter 17: DHCP Overview
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