====== Access-Request format for the PPPoE networks ======
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Access-Request request being formed by the fastpcrf contains the following Radius attributes:
  * ''User-Name'' - for the PAP/CHAP/MS-CHAPv2: subscriber login. In order to authorize by MAC address this attribute contains the subscriber MAC address as a string, similar to the Calling-Station-Id attribute. 
  * ''Password'' - subscriber password (only for the PAP authorization)
  * ''CHAP-Challenge'' and ''CHAPPassword''- for the CHAP authorization
  * ''MS_CHAP_Challenge'' and ''MS_CHAP2_Response'' (Microsoft VSA) - for the MS-CHAPv2 authorization
  * ''Calling-Station-Id'' - subscriber MAC address as a string, for example, '01:02:e4:55:da:f5'. Here, the small letters for hex-digits A-F are used.
  * ''Acct-Session-Id'' - accounting sesson identifier. This attribute is always passed even if you do not use the VAS Experts DPI accounting.
  * ''Service-Type'' = 2 (Framed)
  * ''Framed-Protocol'' = 1 (PPP)

[SSG 7.6+] If Access-Request is initiated by the
[[en:dpi:bras_bng:radius_integration:radius_auth_server_integration:radius_auth_coa|CoA request of reauthorization]],
then the ''Framed-IP-Address'' attribute containing the subscriber IP address is added.

Attributes identifying the NAS (i.e., VAS Experts DPI):

''NAS-IP-Address'' - NAS IP address is specified in the fastpcrf.conf by the ''radius_attr_nas_ip_address'' configuration option. 
If this option is not specified in the fastpcrf.conf, the NAS-IP-Address attribute will not be added to the Access-Request.
    
''NAS-Identifier'' - NAS identifier is specified in the fastpcrf.conf by the ''radius_attr_nas_id'' configuration option. 
If this option is not specified in the fastpcrf.conf, the NAS-IP-Address attribute will not be added to the Access-Request.
        
Note that only one of the attributes - NAS-IP-Address or NAS-Identifier is added to the Access-Request depending on the fastpcrf.conf settings. If both radius_attr_nas_ip_address and radius_attr_nas_id options are specified in the fastpcrf.conf, the only NAS-IP-Address is included in the Access-Request. The radius_add_all_nas_ids parameter allows you to add both of these attributes to the request:
<code># Allows to add NAS-IP-Address AND NAS-Identifier 
	# By RFC, the request can include either NAS-IP-Address or NAS-Identifier.
	# If both options are specified then priority is given to NAS-IP-Address option.
	# The value of this parameter 1 allows you to add both attributes to the request.
#radius_add_all_nas_ids=0</code>

''VASExperts-Service-Type'' - Vendor-Specific attribute containing the number (int32) defining the PPPoE authorization type:
     * VASExperts-Service-Type = 2 - for the PAP
     * VASExperts-Service-Type = 3 - for the CHAP 
     * VASExperts-Service-Type = 4 - for the MS-CHAPv2
     * VASExperts-Service-Type = 5 - for the MAC address authorization

''Message-Authenticator'' - [RFC2869] is formed if the ''radius_msg_auth_attr = 1'' options is specified in the fastpcrf.conf

If the incoming subscriber packet contains VLANs (that is, if you have a PPPoE network with L2 VLAN tags):
  * ''NAS-Port-Type'' - is specified in the fastpcrf.conf by the ''radius_attr_nas_port_type'' configuration option, its default value is 5 (Virtual)
  * ''NAS-Port'' - VLAN value
  * 
If the incoming subscriber package contains Q-in-Q (that is, if you have a PPPoE network with L2-QinQ tags):
  * ''NAS-Port-Type'' - is specified in the fastpcrf.conf by the ''radius_attr_nas_port_type'' configuration option, its default value is 5 (Virtual)
  * ''NAS-Port-Id'' - VLAN value as a string using like "outerVLAN/innerVLAN" format, for example, "10/102"

=====Supports PPPoE circuit-id and remote-id options=====

SSG as of version 8.2 supports the PPPoE options circit-id and remote-id according to [[https://tools.ietf.org/html/rfc4679|RFC 4679]]. The values of these options are passed to Access-Request in the VSA attributes ''Agent-Circuit-Id'' and ''Agent-Remote-Id'' respectively, vendor-id=3561.

=====Support Huawei vendor-specific tag 1=====

SSG 12.4 - added support for Huawei vendor-specific tag 1.

The value is interpreted as ''ADSL-Forum-Circuit-Id''.

If PPPoE packet contains ''Circuit-Id'' and ''Huawei tag 1'', ''Circuit-Id'' is preferred, ''Huawei tag 1'' is ignored.