Capas Del Modelo Tcp

IPDC
Internet Drafts: draft-draft-taylor-ipdc-00.txt, draft-calhoun-diameter-07.txt
IP Device Control (IPDC) is a family of protocols, components of which can be used individually or together to perform connection control, media control, and signalling transports. It fulfills a need for one or more protocols to control gateway devices which sit at the boundary between the circuit- switchedtelephone network and the internet and terminate circuit- switched trunks. Examples of such devices include network access servers and voice-over-IP gateways. The need for a control protocol separate from call signalling arises when the service control logic needed to process calls lies partly or wholly outside the gateway devices. IPDC was build on the base structure provided by the DIAMETERprotocol which was specifically written for authentication, authorization, and accounting applications.
The format of the header is shown in the following illustration:
Radius PCC
(1 byte) | PKT
(5 bits) | Ver
(3 bits) | Packet Length (2 bytes) |
Identifier (4 bytes) |
 Sequence number | Next Received (Nr) (2 bytes) |
Attributes |
1 byte | 1 byte | 1 byte | 1 byte |
IPDC structure|
Radius PCC
Packet Compatibility Code (PCC) field is used for RADIUS backward compatibility. In order to easily distinguish DIAMETER/IPDC messages from RADIUS a special value has been reserved and allows an implementation to support both protocols concurrently using the first octet in the header. The RADIUS PCC field must be set to 254, DIAMETER/IPDC message.
PKT Flags
Packet Flags areused to identify any options.
Version
Version number associated with the packet received. This field is set to 1 to indicate IPDC version 1.
Packet Length
Indicates the length of the message including the header fields.
Identifier
Aids in matching requests and replies.
Next Send
This field is present when the Window-Present bit is set in the header flags. The Next Send (Ns) is copied fromthe send sequence number state variable (Ss) at the time the message is transmitted.
Next Received
This field is present when the Window-Present bit is set in the header flags. Nr is copied from the receive sequence number state variable (Sr) and indicates the sequence number (Ns) +1 of the highest (modulo 2^16) in-sequence message received.
Attributes
IPDC Attributes carry the specificcommands and parameters which must be exchanged between IPDC protocol endpoints to perform the tasks associated with Media Gateway control.

IRC
ftp://ftp.rfc-editor.org/in-notes/rfc1459.txt
The IRC (Internet Relay Chat protocol) supports a worldwide network of servers and clients, and is stringing to cope with growth. It is a text-based protocol, with the simplest client being any socketprogram capable of connecting to the server.

The IRC protocol was developed on systems using the TCP/IP network protocol, although there is no requirement that this remain the only sphere in which it operates. It is a teleconferencing system, which (through the use of the client-server model) is well-suited to running on many machines in a distributed fashion. A typical setup involves a singleprocess (the server) forming a central point for clients (or other servers) to connect to, performing the required message delivery/multiplexing and other functions.

Servers and clients send each other messages which may or may not generate a reply. If the message contains a valid command, the client should expect a reply as specified but it is not advised to wait forever for the reply; client toserver and server to server communication is essentially asynchronous in nature.
Each IRC message may consist of up to three main parts: the prefix (optional), the command, and the command parameters (of which there may be up to 15). The prefix, command, and all parameters are separated by one (or more) ASCII space character(s) (0x20).
Messages are as follows:

Server/Nick_Name
The...