Layer 3 Portal Authentication Process - HP 5120 SI Series Security Configuration Manual

authentication server assigns the authorized VLAN to the access device. Then, the access device adds the
user to the authorized VLAN and generates a MAC VLAN entry. If the authorized VLAN does not exist,
the access device first creates the VLAN. Then, the port allows the packets from the VLAN to pass, with
the VLAN tag stripped.
By deploying the authorized VLAN assignment function, you can control which authenticated users can
access which network resources.
Auth-Fail VLAN
The Auth-Fail VLAN feature allows users failing authentication to access a VLAN that accommodates
network resources such as the patches server, virus definitions server, client software server, and anti-virus
software server, so that the users can upgrade their client software or other programs. Such a VLAN is
called an Auth-Fail VLAN.
Layer 2 portal authentication supports Auth-Fail VLAN on a port that performs MAC-based access control.
With an Auth-Fail VLAN configured on a port, if a user on the port fails authentication, the access devices
creates a MAC VLAN entry based on the MAC address of the user and adds the user to the Auth-Fail
VLAN. Then, the user can access the non-HTTP resources in the Auth-Fail VLAN, and all HTTP requests of
the user will be redirected to the authentication page. If the user passes authentication, the access device
adds the user to the assigned VLAN or return the user to the initial VLAN of the port, depending on
whether the authentication server assigns a VLAN. If the user fails the authentication, the access device
keeps the user in the Auth-Fail VLAN. If an access port receives no traffic from a user in the Auth-Fail
VLAN during a specific period of time (90 seconds by default, non-modifiable), it removes the user from
the Auth-Fail VLAN and adds the user to the initial VLAN of the port.
NOTE:
After a user is added to the authorized VLAN or Auth-Fail VLAN, the IP address of the client needs to be
automatically or manually updated to make sure that the client can communicate with the hosts in the
VLAN.
Assignment of authorized ACLs
The device can use ACLs to control user access to network resources and limit user access rights. With
authorized ACLs specified on the authentication server, when a user passes authentication, the
authentication server assigns an authorized ACL for the user, and the device filters traffic from the user on
the access port according to the authorized ACL. You must configure the authorized ACLs on the access
device if you specify authorized ACLs on the authentication server. To change the access right of a user,
specify a different authorized ACL on the authentication server or change the rules of the corresponding
authorized ACL on the device.

Layer 3 portal authentication process

Direct authentication and cross-subnet authentication share the same authentication process.
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