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Appendix F. Supported RADIUS
Attribute/Value Pairs for L2TP
operation
RADIUS is used for authentication and accounting of L2TP connections. If no authentication servers are
configured then authentication is not performed. If no accounting servers are configured then no accounting
is generated. Multiple servers can be configured and they are processed in order. Each can have multiple IP
addresses. The IP addresses are tried based on the previous performance (response time, etc). If a server does
not respond a number of times as configured then it is blacklisted for a configurable period.
It is possible to configure local configurations which are checked before any RADIUS authentication.
It is possible to configure L2TP so that RADIUS accounting must respond, and if not then the sessions are
disconnected.
F.1. Authentication request
Table F.1. Access-request
AVP
No. Usage
Message-
Authenticator
80 Message signature as per RFC2869
User-Name
1 Username from authentication (PAP/CHAP) or proxy authentication received
on L2TP
Called-Station-Id
30 Called number as received on L2TP
Calling-Station-Id
31 Calling number as received on L2TP
Acct-Session-Id
44 Unique ID for session as used on all following accounting records
NAS-Identifier
32 Configured hostname of FireBrick
NAS-IP-Address
4 NAS IPv4 address if using IPv4
NAS-IPv6-Address
95 NAS IPv6 address if using IPv6
NAS-Port
5 L2TP session ID
Service-Type
6 Framed
Framed-Protocol
7 PPP
CHAP-Password
3 CHAP ID and response
CHAP-Challenge
60 CHAP challenge (only present if not the same as RADIUS authenticator)
Framed-MTU
12 MTU requested by PPP, if one was requested (even if 1500)
Connect-Info
77 Text Tx speed/Rx speed from L2TP connection if known
Tunnel-Client-
Endpoint
66 Indicates the L2TP tunnel configured name attribute, allowing connections via
different L2TP incoming configurations to be identified
Note that the NAS-IP-Address is normally the local end of the L2TP connection for the incoming connection.
However, there is a configuration option to pass the remote end of the L2TP as the NAS-IP-Address as this is
often more useful. If the remote Ip is used the NAS-Port is set to the far end L2TP session ID rather than the
local end session ID. The NAS-Identified remains the name of the FB6000. This option is separately available
for accounting messages.
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