Cisco Cisco Clean Access 3.5

You can enable the DHCP operation mode on a per-Clean Access Server basis. From Device 
Management > CCA Servers > List of Servers, click the Manage button (

) next to the Clean Access 

Server.

Click the DHCP link to open the DHCP form in the Network tab.

From the DHCP Type dropdown menu, select an option and click the Select DHCP Type button. 
(Note that this button label toggles to Select DHCP Type and Reboot Clean Access Server when 
in DHCP Server mode.)

Options are as follows:

DHCP Passthrough – In this mode, the Clean Access Server propagates DHCP broadcast 
messages across its interfaces without change. This mode should be selected if a DHCP server 
already exists on the trusted network.

DHCP Relay – In this mode, the Clean Access Server forwards DHCP messages between 
clients and a specific external DHCP server. For DHCP Relay, you need to configure the DHCP 
server in the environment so that it hands out the Clean Access Server’s untrusted (eth1) address 
as the gateway IP address to managed clients. 

If you select DHCP Relay mode, type the IP address of the external DHCP server in the Relay 
to DHCP server field and click the Update button.

DHCP Server – This sets the Clean Access Server to perform DHCP services for managed 
clients. Selecting DHCP Server mode displays the DHCP Status, Subnet List, Reserved IPs, 
Auto-Generate, and Global Options tabs in the form (

). From there, you can add IP 

pools manually, auto-generate pools and subnets, and specify reserved IPs, as described in 

.

Once DHCP Server is selected, to switch to a different DHCP Type for the Clean Access Server, you 
must reboot the CAS. To change the type, select DHCP Passthrough or DHCP Relay from the 
dropdown menu and click the button Select DHCP Type and Reboot Clean Access Server.

DHCP Link 

DHCP Type 
dropdown menu