1 DCCP protocol
2 ============
3
4 Last updated: 10 November 2005
5
6 Contents
7 ========
8
9 - Introduction
10 - Missing features
11 - Socket options
12 - Notes
13
14 Introduction
15 ============
16
17 Datagram Congestion Control Protocol (DCCP) is an unreliable, connection
18 based protocol designed to solve issues present in UDP and TCP particularly
19 for real time and multimedia traffic.
20
21 It has a base protocol and pluggable congestion control IDs (CCIDs).
22
23 It is at draft RFC status and the homepage for DCCP as a protocol is at:
24 http://www.icir.org/kohler/dcp/
25
26 Missing features
27 ================
28
29 The DCCP implementation does not currently have all the features that are in
30 the draft RFC.
31
32 In particular the following are missing:
33 - CCID2 support
34 - feature negotiation
35
36 When testing against other implementations it appears that elapsed time
37 options are not coded compliant to the specification.
38
39 Socket options
40 ==============
41
42 DCCP_SOCKOPT_PACKET_SIZE is used for CCID3 to set default packet size for
43 calculations.
44
45 DCCP_SOCKOPT_SERVICE sets the service. This is compulsory as per the
46 specification. If you don't set it you will get EPROTO.
47
48 Notes
49 =====
50
51 SELinux does not yet have support for DCCP. You will need to turn it off or
52 else you will get EACCES.
53
54 DCCP does not travel through NAT successfully at present. This is because
55 the checksum covers the psuedo-header as per TCP and UDP. It should be
56 relatively trivial to add Linux NAT support for DCCP.
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