D-LAN

h1. Protocols

This page describes the protocols used by Aybabtu for network communication between cores and between core and GUI.

h2. Core <-> Core

see source:protos/network_protocol.proto.

h3. Parameters

Most parameters will be stored as constants in their component.

|_.Name|_.Value |_.Unit|_.Explanation/Comments|

| _ChunkSize_ | 33554432 | [Byte] | (32 MB) |

| _LanSpeed_ | 52428800 | [Byte/s] | (50 MB/s) |

| _TimeRecheckChunkFactorv | 4 | - | If the time to download a chunk exceeds _TimeRecheckChunkFactor_ * ChunkSize / LanSpeed then the peers are rescanned to choose a better one (better download rate). For example : 4 * 32 / 50 = 2.6 second |

| _SwitchToAnotherPeerFactor_ | 1.5 | - | During the recheck of the peers to choose a better one the other download rate must be above the current * _SwitchToAnotherPeerFactor_ |

| _DownloadRateValidTime_ | 1500 / _LanSpeed_ = 300 s | [s] | (5 min). The download rate of a peer is valid this time after its last update. After that it's equals to the maximum. | 

| _TimeBetweenChunksUpdate_ | 500 / _LanSpeed_ = 10 s | [s] | Each 10 s a daemon will scan the _NumberOfChunkToUpdate_ first chunks from the first queued downloads to know which peer has which chunk. |

| _NumberOfChunkToUpdate_ | 100 * _LanSpeed_ / _ChunkSize_ = 156 | - | The first 156 chunks (3 kB) will by send periodically to each peer. |

h2. Core <-> GUI