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Appendix E. Supported L2TP
Attribute/Value Pairs
This appendix details the L2TP protocol messages supported, and the attribute/value pairs (AVPs) which are
sent and expected for each message.
E.1. Start-Control-Connection-Request
Table E.1. SCCRQ
AVP
No. Incoming
Outgoing
Message Type
0 Value 1
Value 1
Protocol Version
2 Mandatory, value 1 expected
Value 1
Framing Capabilities
3 Ignored
Value 3
Bearer Capabilities
4 Ignored
Not sent
Tie Breaker
5 Ignored as FireBrick only accepts
connections for inbound calls
Not sent
Firmware Revision
6 Ignored
FireBrick s/w version string
Host Name
7 Used to select which incoming L2TP
configuration applies.
As per config/RADIUS request
Vendor Name
8 Ignored
FireBrick Ltd
Assigned Tunnel ID
9 Mandatory
Mandatory, our tunnel ID
Receive Window Size
10 Accepted, assumed 4 if not present or
less than 4 is specified
Value 4
Challenge
11 Accepted if a configured secret is
defined, a response is sent in the
SCCRP
Not sent at present
E.2. Start-Control-Connection-Reply
Table E.2. SCCRP
AVP
No. Incoming
Outgoing
Message Type
0 Value 2
Value 2
Protocol Version
2 Value 1 expected
Value 1
Framing Capabilities
3 Ignored
Value 3
Bearer Capabilities
4 Ignored
Not sent
Firmware Revision
6 Ignored
FireBrick s/w ID number
Host Name
7 Logged as hostname for tunnel
Configured hostname, if defined
Vendor Name
8 Ignored
FireBrick Ltd
Assigned Tunnel ID
9 Expected as far end ID
Mandatory, our tunnel ID
Receive Window Size
10 Accepted, assimed 4 if not present or
less than 4
Not sent, assume 4
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