H3C Technologies H3C S6300 Series Switches - Manual (Page 157)

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Re-DHCP portal authenticated users cannot log in successfully
Symptom
The device performs re-DHCP portal authentication for users. A user enters the correct username and
password, and the client successfully obtains the private and public IP addresses. However, the
authentication result for the user is failure.
Analysis
When the access device detects that the client IP address is changed, it sends an unsolicited portal
packet to notify of the IP change to the portal authentication server. The portal authentication server
notifies of the authentication success only after it receives the IP change notification from both the access
device and the client.
If the BAS-IP or BAS-IPv6 address carried in the portal notification packet is different from the portal
device IP address specified on the portal authentication server, the portal authentication server discards
the portal notification packet. As a result, the portal authentication server considers that the user has
failed the authentication.
Solution
Configure the BAS-IP or BAS-IPv6 attribute on the interface enabled with portal authentication. Make
sure the attribute value is the same as the portal device IP address specified on the portal authentication
server.