R2511-HP MSR Router Series Security Configuration Guide(V5)

305
• In re-DHCP authentication mode, a client can use a public IP address to send packets before
passing portal authentication. However, responses to the packets are restricted.
Configuration prerequisites
Before enabling Layer 3 portal authentication on an interface, make sure the following requirements are
met:
• An IP address is configured for the interface.
• The interface is not added to any port aggregation group.
• The portal server to be referenced on the interface exists.
• Layer 2 portal authentication is not enabled on any ports.
Configuration procedure
To enable Layer 3 portal authentication:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
The interface must be a Layer 3
Ethernet interface.
3. Enable Layer 3 portal
authentication on the
interface.
portal server server-name method
{ direct | layer3 | redhcp }
Not enabled by default.
Controlling access of portal users
Configuring a portal-free rule
A portal-free rule allows specified users to access specified external websites without portal
authentication.
The matching items for a portal-free rule include the source and destination IP address, source MAC
address, inbound interface, and VLAN. Packets matching a portal-free rule will not trigger portal
authentication, so users sending the packets can directly access the specified external websites.
For Layer 2 portal authentication, you can configure only a portal-free rule that is from any source
address to any or a specific destination address. If you configure a portal-free rule that is from any source
address to a specific destination address, users can access the specified address directly, without being
redirected to the portal authentication page for portal authentication. Usually, you can configure the IP
address of a server that provides certain services (such as software upgrading service) as the destination
IP address of a portal-free rule, so that Layer 2 portal authentication users can access the services without
portal authentication.
Configuration guidelines
• If you specify both a VLAN and an interface in a portal-free rule, the interface must belong to the
VLAN. Otherwise, the rule does not take effect.
• You cannot configure two or more portal-free rules with the same filtering criteria. Otherwise, the
system prompts that the rule already exists.
• Regardless of whether portal authentication is enabled or not, you can only add or remove a
portal-free rule. You cannot modify it.