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Cisco ASDM User Guide
OL-16647-01
Chapter 13 DHCP, DNS and WCCP Services
DHCP Relay
Prerequisites
Before you can enable a DHCP relay agent on an interface, you must have at least one DHCP relay global
server in the configuration or DHCP relay interface server.
Fields
• DHCP Relay Agent—Display only. Contains the fields for configuring the DHCP relay agent.
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Interface—Displays the interface ID. Double-clicking the interface opens the Edit DHCP Relay
Agent Settings dialog box, where you can enable the DHCP relay agent and configure the relay
agent parameters.
Note You can double-click anywhere in the row for a particular interface to open the dialog box
for that interface.
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DHCP Relay Enabled—Indicates whether the DHCP relay agent is enabled on the interface.
This column displays “Yes” if the DHCP relay agent is enabled or “No” if the DHCP relay agent
is not enabled on the interface.
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Set Route—Indicates whether the DHCP relay agent is configured to modify the default router
address in the information returned from the DHCP server. This column display “Yes” if the
DHCP relay agent is configured to change the default router address to the interface address or
“No” if the DHCP relay agent does not modify the default router address.
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Edit—Opens the Edit DHCP Relay Agent Settings dialog box, where you can enable the DHCP
relay agent and configure the relay agent parameters.
• DHCP Relay Global Server—Contains the fields for configuring the DHCP relay global servers.
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Server—Display only. Displays the IP address of a configured, external DHCP server.
Double-clicking a server address opens the DHCP Relay - Edit DHCP Server dialog box, where
you can edit the DHCP relay global server settings.
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Interface—Display only. Display the interface the specified DHCP server is attached to.
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Add—Opens the DHCP Relay - Add DHCP Server dialog box, where you can specify a new
DHCP relay global server. You can define up to 4 DHCP relay global servers on the security
appliance. This button is unavailable if you already have 4 DHCP relay global servers defined.
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Edit—Opens the DHCP Relay - Edit DHCP Server dialog box, where you can edit the DHCP
relay global server settings.
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Delete—Removes the selected DHCP relay global server. The server is removed from the
security appliance configuration when you apply or save your changes.
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Timeout—Specifies the amount of time, in seconds, allowed for DHCP address negotiation.
Valid values range from 1 to 3600 seconds. The default value is 60 seconds.
Modes
The following table shows the modes in which this feature is available:
Firewall Mode Security Context
Routed Transparent Single
Multiple
Context System
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