In the Broadband
Access (BBA) environment, PPPoE Active Discovery Offer (PADO) sent from the
Broadband Remote Access Server (BRAS) includes the AC-cookie tags (0x0104) and
the AC-name tag (0x0102) along with a service-name tag identical to the one in
the PPPoE Active Directory Initiation (PADI) and any number of other
service-name tags indicating other services that access concentrator (AC)
The AC-name is a
string that uniquely identifies the particular AC. The AC-cookie tags are used
by the AC to protect the denial-of-service (DoS) attacks.
The PPPoE Active
Directory Request (PADR) from the Customer Premise Equipment (CPE) host also
includes AC-name and AC-cookie tags received in PADO. BRAS repeats the AC
information in the PPPoE Active Discovery Session-Confirmation (PADS) packet
sent in response to PADR received from client (CPE).
When BRAS generates
a unique session identifier for the PPPoE session, the AC-name and AC-cookie
tags need not be sent in the PADS. This feature prevents sending the AC
information in the device.