Internet Assigned Numbers Authority

Datagram Congestion Control Protocol (DCCP) Parameters

Created
2005-08-25
Last Updated
2024-03-12
Available Formats

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Registries included below

Packet Types

Registration Procedure(s)
Standards Action
Reference
[RFC4340]
Available Formats

CSV
Type Description/Meaning Reference
0 DCCP-Request [RFC4340]
1 DCCP-Response [RFC4340]
2 DCCP-Data [RFC4340]
3 DCCP-Ack [RFC4340]
4 DCCP-DataAck [RFC4340]
5 DCCP-CloseReq [RFC4340]
6 DCCP-Close [RFC4340]
7 DCCP-Reset [RFC4340]
8 DCCP-Sync [RFC4340]
9 DCCP-SyncAck [RFC4340]
10 DCCP-Listen [RFC5596]
11-13 Unassigned [RFC4340]
14 Reserved for experimental and testing use [RFC4340]
15 Unassigned [RFC4340]

Reset Codes

Reference
[RFC4340]
Available Formats

CSV
Range Registration Procedures Note
12-119 IETF Review (IETF RFC publication)
120-126 Reserved For experimental and testing use
127 IETF Review (IETF RFC publication)
128-255 CCID-specific codes [1]
Reset Code Name Reference
0 Unspecified [RFC4340]
1 Closed [RFC4340]
2 Aborted [RFC4340]
3 No Connection [RFC4340]
4 Packet Error [RFC4340]
5 Option Error [RFC4340]
6 Mandatory Error [RFC4340]
7 Connection Refused [RFC4340]
8 Bad Service Code [RFC4340]
9 Too Busy [RFC4340]
10 Bad Init Cookie [RFC4340]
11 Aggression Penalty [RFC4340]
12 Encapsulated Port Reuse [RFC6773]
13-119 Unassigned [RFC4340]
120-126 Reserved [RFC4340]
127 Unassigned [RFC4340]
128-255 CCID-specific codes [RFC4340]

Option Types

Reference
[RFC4340]
Available Formats

CSV
Range Registration Procedures Note
3-30 IETF Review (IETF RFC publication)
45-119 IETF Review (IETF RFC publication)
120-126 Reserved For experimental and testing use
127 IETF Review (IETF RFC publication)
128-255 CCID-specific codes [1]
Type Description/Meaning Reference
0 Padding [RFC4340]
1 Mandatory [RFC4340]
2 Slow Receiver [RFC4340]
3-30 Unassigned [RFC4340]
31 Reserved for experimental and testing use [RFC4340]
32 Change L [RFC4340]
33 Confirm L [RFC4340]
34 Change R [RFC4340]
35 Confirm R [RFC4340]
36 Init Cookie [RFC4340]
37 NDP Count [RFC4340]
38 Ack Vector [Nonce 0] [RFC4340]
39 Ack Vector [Nonce 1] [RFC4340]
40 Data Dropped [RFC4340]
41 Timestamp [RFC4340]
42 Timestamp Echo [RFC4340]
43 Elapsed Time [RFC4340]
44 Data Checksum [RFC4340]
45 Quick-Start Response [RFC5634]
46-119 Unassigned [RFC4340]
120-126 Reserved [RFC4340]
127 Unassigned [RFC4340]
128-255 CCID-specific codes [RFC4340]

Feature Numbers

Reference
[RFC4340]
Available Formats

CSV
Range Registration Procedures Note
10-119 IETF Review (IETF RFC publication)
120-126 Reserved For experimental and testing use
127 IETF Review (IETF RFC publication)
128-255 CCID-specific codes [1]
Number Description/Meaning Reference
0 Reserved [RFC4340]
1 Congestion Control ID (CCID) [RFC4340]
2 Allow Short Seqnos [RFC4340]
3 Sequence Window [RFC4340]
4 ECN Incapable [RFC4340]
5 Ack Ratio [RFC4340]
6 Send Ack Vector [RFC4340]
7 Send NDP Count [RFC4340]
8 Minimum Checksum Coverage [RFC4340]
9 Check Data Checksum [RFC4340]
10 Multipath Capable (TEMPORARY - registered 2024-03-12, expires 2025-03-12) [RFC-ietf-tsvwg-multipath-dccp-13]
11-119 Unassigned [RFC4340]
120-126 Reserved [RFC4340]
127 Unassigned [RFC4340]
128-255 CCID-specific codes [RFC4340]

Congestion Control Identifiers

Reference
[RFC4340]
Available Formats

CSV
Range Registration Procedures Note
0-1 IETF Review (IETF RFC publication)
4-247 IETF Review (IETF RFC publication)
248-254 Reserved For experimental and testing use
255 IETF Review (IETF RFC publication)
CCID Description/Meaning Reference
0-1 Unassigned [RFC4340]
2 TCP-like Congestion Control [RFC4341]
3 TFRC Congestion Control [RFC4342]
4 TCP-Friendly Rate Control for Small Packets [RFC5622]
5-247 Unassigned [RFC4340]
248-254 Reserved [RFC4340]
255 Unassigned [RFC4340]

Ack Vector States

Registration Procedure(s)
Standards Action
Reference
[RFC4340]
Available Formats

CSV
State Description/Meaning Reference
0 Received [RFC4340]
1 Received ECN Marked [RFC4340]
2 Unassigned [RFC4340]
3 Not Yet Received [RFC4340]

Drop Codes

Registration Procedure(s)
Standards Action
Reference
[RFC4340]
Available Formats

CSV
Drop Code Description/Meaning Reference
0 Protocol Constraints [RFC4340]
1 Application Not Listening [RFC4340]
2 Receive Buffer [RFC4340]
3 Corrupt [RFC4340]
4-6 Unassigned [RFC4340]
7 Delivered Corrupt [RFC4340]

Service Codes

Reference
[RFC4340]
Note
Service Codes can be found at the following:
http://www.iana.org/assignments/service-codes

Footnote

[1] 
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.  [RFC4340], 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