H3C Technologies H3C S7500E Series Switches - Manual (Page 163)

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passing portal authentication, the host uses an assigned private IP address. After passing
portal authentication, it can get a public IP address.
z When users have passed identity authentication but have not passed security checking,
they can access only subnet 192.168.0.0/24. After passing the security checking, they can
access Internet resources.
z A RADIUS server serves as the authentication/accounting server.
Figure 8-13 Configure re-DHCP portal authentication with extended functions
Host
automatically obtains
an IP address
192.168.0.111/24
192.168.0.113/24
192.168.0.112/24
Switch
Vlan-int100
20.20.20.1/24
10.0.0.1/24 sub
Vlan-int2
192.168.0.100/24
Portal server
RADIUS server
DHCP server
192.168.0.114/24
Security policy server
Configuration procedure
z For re-DHCP authentication, you need to configure a public address pool (20.20.20.0/24, in
this example) and a private address pool (10.0.0.0/24, in this example) on the DHCP server.
The configuration steps are omitted. For DHCP configuration information, see DHCP
Server Configuration in the Layer 3 - IP Services Configuration Guide.
z For re-DHCP authentication, the switch must be configured as a DHCP relay agent (instead
of a DHCP server) and the portal-enabled interface must be configured with a primary IP
address (a public IP address) and a secondary IP address (a private IP address).
z Make sure that the IP address of the portal device added on the portal server is the private
IP address of the interface connecting users (10.0.0.1 in this example), and the IP address
group associated with the portal device is the private network segment where the users
reside (10.0.0.0/24 in this example).
z You need to configure IP addresses for the devices as shown in Figure 8-13 and ensure
that routes are available between devices.
z Perform configurations on the RADIUS server to ensure that the user authentication and
accounting functions can work normally.
Configure the switch: