R3303-HP HSR6800 Routers Security Configuration Guide

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Configuring re-DHCP portal authentication with extended
functions
Network requirements
As shown in Figure 59, the host obtains an IP address from the DHCP server.
Configure the router to perform extended re-DHCP portal authentication for users on the host. Before a
user passes portal authentication, the DHCP server assigns a private IP address to the host. After the user
passes portal authentication, the DHCP server assigns a public IP address to the host. If a user fails
security check after passing identity authentication, the user can access only subnet 192.168.0.0/24.
After passing security check, the user can access Internet resources.
A RADIUS server serves as the authentication/authorization server.
Figure 59 Network diagram
Configuration prerequisites and guidelines
• Configure IP addresses for the router and servers as shown in Figure 59 and make sure the host,
router, and servers can reach each other.
• Configure the RADIUS server properly to provide authentication and authorization functions for
users.
• For re-DHCP portal authentication, 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. (Details
not shown.)
• For re-DHCP portal authentication, the router must be configured as a DHCP relay agent 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). For information about DHCP relay agent configuration,
see Layer 3—IP Services Configuration Guide.
• Make sure the IP address of the portal device added on the portal server is the public IP address of
the interface connecting users (20.20.20.1 in this example), the private IP address range for 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), and the public IP address range for the IP address group is
the public network segment 20.20.20.0/24.