Configuring cross-subnet portal authentication

As shown in Figure 49:

• Switch A is configured for cross-subnet portal authentication. Before passing portal authentication, the host can access only the portal server. After passing portal authentication, the host can access Internet resources.

• The host accesses Switch A through Switch B.

• A RADIUS server serves as the authentication/accounting server.

When configuring cross-subnet portal authentication, follow these guidelines:

• Configure IP addresses for the host, switches, and servers as shown in Figure 49 and make sure they can reach each other.

• Configure the RADIUS server properly to provide authentication and accounting functions for users.

• Make sure the IP address of the portal device added on the portal server is the IP address of the interface connecting users (20.20.20.1 in this example), and the IP address group associated with the portal device is the network segment where the users reside (8.8.8.0/24 in this example).

Perform the following configuration to configure cross-subnet portal authentication on Switch A:

# Create a RADIUS scheme named rs1 and enter its view.

<SwitchA> system-view
[SwitchA] radius scheme rs1

# Set the server type for the RADIUS scheme. When using the IMC server, set it to extended.

[SwitchA-radius-rs1] server-type extended

# Specify the primary authentication server and primary accounting server, and configure the keys for communication with the servers.

[SwitchA-radius-rs1] primary authentication 192.168.0.112
[SwitchA-radius-rs1] primary accounting 192.168.0.112
[SwitchA-radius-rs1] key authentication simple radius
[SwitchA-radius-rs1] key accounting simple radius

# Specify that the ISP domain name should not be included in the username sent to the RADIUS server.

[SwitchA-radius-rs1] user-name-format without-domain
[SwitchA-radius-rs1] quit

# Create an ISP domain named dm1 and enter its view.

[SwitchA] domain dm1

# Configure AAA methods for the ISP domain.

[SwitchA-isp-dm1] authentication portal radius-scheme rs1
[SwitchA-isp-dm1] authorization portal radius-scheme rs1
[SwitchA-isp-dm1] accounting portal radius-scheme rs1
[SwitchA-isp-dm1] quit

# Configure domain dm1 as the default ISP domain for all users. Then, if a user enters the username without the ISP domain at logon, the authentication and accounting methods of the default domain are used for the user.

[SwitchA] domain default enable dm1

# Configure the portal server as follows:

• Name: newpt

• IP address: 192.168.0.111

• Key: portal in plain text

• Port number: 50100

• URL: http://192.168.0.111:8080/portal

[SwitchA] portal server newpt ip 192.168.0.111 key simple portal port 50100 url http://192.168.0.111:8080/portal

# Enable portal authentication on the interface connecting Switch B.

[SwitchA] interface vlan-interface 4
[SwitchA–Vlan-interface4] portal server newpt method layer3
[SwitchA–Vlan-interface4] quit

On Switch B, configure a default route to subnet 192.168.0.0/24, setting the next hop as 20.20.20.1. (Details not shown.)