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When DHCP proxy is enabled on the controller, the controller unicasts DHCP requests from the client to the configured servers. At least one DHCP server must be configured on either the interface associated with the WLAN or the WLAN itself.
 Note |
DHCP proxy is enabled by default. |
This section contains the following subsections:
DHCP proxy must be enabled in order for DHCP option 82 to operate correctly.
All controllers that will communicate must have the same DHCP proxy setting.
DHCP v6 Proxy is not supported.
| Step 1 |
Choose Controller > Advanced > DHCP to open the DHCP Parameters page. |
| Step 2 |
Select the Enable DHCP Proxy check box to enable DHCP proxy on a global basis. Otherwise, unselect the check box. The default value is selected. |
| Step 3 |
Click Apply to commit your changes. |
| Step 4 |
Click Save Configuration to save your changes. |
| Step 1 |
Choose Controller > Interfaces. |
| Step 2 |
Select the interface you want to configure the DHCP proxy. |
| Step 3 |
Select from the following option of the proxy mode drop-down to enable DHCP proxy on the selected management interface:Global—Uses the global DHCP proxy mode on the controller.Enabled—Enables the DHCP proxy mode on the interface. When you enable DHCP proxy on the controller; the controller unicasts the DHCP requests from the client to the configured servers. You must configure at least one DHCP server on either the interface associated with the WLAN or on the WLAN.Disabled—Disables the DHCP proxy mode on the interface. When you disable the DHCP proxy on the controller, the DHCP packets transmitted to and from the clients are bridged by the controller without any modification to the IP portion of the packet. Packets received from the client are removed from the CAPWAP tunnel and transmitted on the upstream VLAN. DHCP packets directed to the client are received on the upstream VLAN, converted to 802.11, and transmitted through a CAPWAP tunnel toward the client. As a result, the internal DHCP server cannot be used when DHCP proxy is disabled. |
| Step 4 |
Check the Enable DHCP option 82 checkbox to ensure additional security when DHCP is used to allocate network addresses, check the Enable DHCP option 82 checkbox. |
| Step 5 |
Click Apply to save the configuration. |
| Step 1 |
Enable or disable DHCP proxy by entering this command: config dhcp proxy {enable | disable} |
| Step 2 |
View the DHCP proxy configuration by entering this command: show dhcp proxy Information similar to the following appears: |
| Step 1 |
Configure the DHCP primary and secondary servers on the interface. To do this, enter the following commands:
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| Step 2 |
Configure DHCP proxy on the management or dynamic interface of the controller. To do this, enter the following command:
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| Step 3 |
Enter the save config command. |
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| Step 4 |
To view the proxy settings of the controller interface enter the show dhcp proxy command. |
| Step 1 |
Choose Controller > Advanced > DHCP to open the DHCP Parameters page. |
| Step 2 |
Select the DHCP Timeout (5 - 120 seconds) check box to enable a DHCP timeout on a global basis. Otherwise, unselect the check box. The valid range is 5 through 120 seconds. |
| Step 3 |
Click Apply to commit your changes. |
| Step 4 |
Click Save Configuration to save your changes. |
Configure a DHCP timeout by entering this command:
config dhcp timeout seconds
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