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Supported L2TP
Attribute/Value Pairs
78
Challenge
11 Accepted if a configured secret is
defined, a response is sent in the
SCCCN
Not sent at present
Challenge Response
13 Not expected at present
Sent if SCCRQ contained a challenge
and we have a secret defined
E.3. Start-Control-Connection-Connected
Table E.3. SCCCN
AVP
No. Incoming
Outgoing
Message Type
0 Value 3
Value 3
Challenge Response
13 Not expected
Sent if was challenged
E.4. Stop-Control-Connection-Notification
Table E.4. StopCCN
AVP
No. Incoming
Outgoing
Message Type
0 Value 4
Value 4
Result Code
1 Ignored (logged)
Sent as appropriate for tunnel close
Assigned Tunnel ID
9 Expected, see note
Sent if a tunnel has been allocated
Note that a StopCCN may not have a zero tunnel ID in the header. If this is the case the source IP, port and
assigned tunnel are used to identify the tunnel.
If an unknown tunnel ID is received on any any incoming packet a StopCCN is generated (once per 10 seconds)
with header tunnel ID 0 and specified assigned tunnel ID.
E.5. Hello
Table E.5. HELLO
AVP
No. Incoming
Outgoing
Message Type
0 Value 6
Value 6
Always responded to. Sent periodically if no other messages sent.
E.6. Incoming-Call-Request
Table E.6. ICRQ
AVP
No. Incoming
Outgoing
Message Type
0 Value 10
Value 10
Assigned Session ID
14 Mandatory
Mandatory, our session ID
Call Serial Number
15 Accepted and passed on if relaying
Passed on incoming value
Bearer Type
18 Ignored
Not sent
Called Number
21 Accepted, used in RADIUS and passed
on if relaying
Passed on incoming value
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