Datagram Congestion Control Protocol (DCCP) Parameters
2005-08-25
2009-09-17
Packet Types
Standards Track RFC
0
DCCP-Request
1
DCCP-Response
2
DCCP-Data
3
DCCP-Ack
4
DCCP-DataAck
5
DCCP-CloseReq
6
DCCP-Close
7
DCCP-Reset
8
DCCP-Sync
9
DCCP-SyncAck
10
DCCP-Listen
11-13
Unassigned
14
Reserved for experimental and testing use
15
Unassigned
Reset Codes
12-119
IETF Consensus (IETF RFC publication)
120-126
Reserved
For experimental and testing use
127
IETF Consensus (IETF RFC publication)
128-255
CCID-specific codes
0
Unspecified
1
Closed
2
Aborted
3
No Connection
4
Packet Error
5
Option Error
6
Mandatory Error
7
Connection Refused
8
Bad Service Code
9
Too Busy
10
Bad Init Cookie
11
Aggression Penalty
12-119
Unassigned
120-126
Reserved
127
Unassigned
128-255
CCID-specific codes
Option Types
3-30
IETF Consensus (IETF RFC publication)
45-119
IETF Consensus (IETF RFC publication)
120-126
Reserved
For experimental and testing use
127
IETF Consensus (IETF RFC publication)
128-255
CCID-specific codes
0
Padding
1
Mandatory
2
Slow Receiver
3-30
Unassigned
31
Reserved for experimental and testing use
32
Change L
33
Confirm L
34
Change R
35
Confirm R
36
Init Cookie
37
NDP Count
38
Ack Vector [Nonce 0]
39
Ack Vector [Nonce 1]
40
Data Dropped
41
Timestamp
42
Timestamp Echo
43
Elapsed Time
44
Data Checksum
45
Quick-Start Response
46-119
Unassigned
120-126
Reserved
127
Unassigned
128-255
CCID-specific codes
Feature Numbers
10-119
IETF Consensus (IETF RFC publication)
120-126
Reserved
For experimental and testing use
127
IETF Consensus (IETF RFC publication)
128-255
CCID-specific codes
0
Reserved
1
Congestion Control ID (CCID)
2
Allow Short Seqnos
3
Sequence Window
4
ECN Incapable
5
Ack Ratio
6
Send Ack Vector
7
Send NDP Count
8
Minimum Checksum Coverage
9
Check Data Checksum
10-119
Unassigned
120-126
Reserved
127
Unassigned
128-255
CCID-specific codes
Congestion Control Identifiers
0-1
IETF Consensus (IETF RFC publication)
4-247
IETF Consensus (IETF RFC publication)
248-254
Reserved
For experimental and testing use
255
IETF Consensus (IETF RFC publication)
0-1
Unassigned
2
TCP-like Congestion Control
3
TFRC Congestion Control
4
TCP-Friendly Rate Control for Small Packets
5-247
Unassigned
248-254
Reserved
255
Unassigned
Ack Vector States
Standards Track RFC
0
Received
1
Received ECN Marked
2
Unassigned
3
Not Yet Received
Drop Codes
Standards Track RFC
0
Protocol Constraints
1
Application Not Listening
2
Receive Buffer
3
Corrupt
4-6
Unassigned
7
Delivered Corrupt
Service Codes
Service Codes can be found at the following:
http://www.iana.org/assignments/service-codes
Note for CCID-specific codes:
DCCP Reset Codes 128-255, Option Types 128-255, and Feature Numbers
128-255 are reserved for CCID-specific use. Each DCCP CCID (that is,
each entry in the DCCP Congestion Control Identifiers registry) may
create registries for its CCID-specific Reset Code, Option Type, and
Feature Number ranges. These CCID-specific registries are independent:
different CCIDs can allocate the same value (such as Feature Number 128)
for different purposes. , Section 10.3,
describes how DCCP decides which registry applies for a given
CCID-specific Reset Code, Option Type, or Feature Number. In each case,
CCID-specific registries may only register values 128-255; values 0-127
are registered here. For examples, see the following:
http://www.iana.org/assignments/dccp-ccid2-parameters/dccp-ccid2-parameters.xhtml
http://www.iana.org/assignments/dccp-ccid3-parameters/dccp-ccid3-parameters.xhtml
http://www.iana.org/assignments/dccp-ccid4-parameters/dccp-ccid4-parameters.xhtml