COSC264 TCP Networking Assignment

Transmission Control Protocol (TCP) simulation for sequential byte file communication between sender, receiver and network channel socket interfaces with an expected packet loss rate of N/((1-P)(1-P)), where N is bit errors for each byte packet transmitted, and P is the independent packet loss probability.

Team

• Adam Ross
• Helen Yang

Instructions

Requirements

• Python3

Run

• input-file is for transmitting and must exist, preferably with data
• P is the probability of packet loss and is required to be between 0.0 and 0.99

The following command will open terminals for simulating TCP file transmission on a local network:

python3 tcp_transmission.py <input-file (str)> <P (float)>

Alternatively, the following can be executed in any sequence using a separate terminal for each:

python3 channel.py <csIn (int)> <csOut (int)> <crIn (int)> <crOut (int)> <sIn (int)> <rIn (int)> <P (float)>

python3 receiver.py <rIn (int)> <rOut (int)> <crIn (int)> <output-file (str)>

python3 sender.py <sIn (int)> <sOut (int)> <csIn (int)> <input-file (str)>

• Each unique <port (int)> value must be a unique integer between 1024 and 64_000
• crIn and csIn must match between channel.py and receiver.py and sender.py, respectively

Example

The following is an example where "Hello World!" is transmitted with N = 0.1 and P = 0.5:

Channel program output

Waiting for connection...
Listening for a socket connection to receiver...
In port for receiver connected...
Out port for receiver connected...
Listening for a socket connection to sender...
In port for sender connected...
Out port for sender connected...
All sockets are connected

Transmission status report: 
Data packet containing 12 chars transmitted from sender
A μ value of 0.4916 < 0.5, indicating #1 occurrence of the probability of a packet loss event
Data packet containing 12 chars transmitted from sender
A μ value of 0.128 < 0.5, indicating #2 occurrence of the probability of a packet loss event
Data packet containing 12 chars transmitted from sender
A μ value of 0.4164 < 0.5, indicating #3 occurrence of the probability of a packet loss event
Data packet containing 12 chars transmitted from sender
Data packet containing 12 chars transmitted to receiver
Acknowledgement packet containing 0 chars transmitted from receiver
A μ value of 0.0112 < 0.5, indicating #4 occurrence of the probability of a packet loss event
Data packet containing 12 chars transmitted from sender
Data packet containing 12 chars transmitted to receiver
Acknowledgement packet containing 0 chars transmitted from receiver
A μ value of 0.3601 < 0.5, indicating #5 occurrence of the probability of a packet loss event
Data packet containing 12 chars transmitted from sender
Data packet containing 12 chars transmitted to receiver
Acknowledgement packet containing 0 chars transmitted from receiver
A μ value of 0.2635 < 0.5, indicating #6 occurrence of the probability of a packet loss event
Data packet containing 12 chars transmitted from sender
A v value of 0.0239 < 0.1, indicating #1 occurrence of the probability of a bit error event
Data packet containing 19 chars transmitted to receiver
Acknowledgement packet containing 0 chars transmitted from receiver
A μ value of 0.2656 < 0.5, indicating #7 occurrence of the probability of a packet loss event
Data packet containing 12 chars transmitted from sender
Data packet containing 12 chars transmitted to receiver
Acknowledgement packet containing 0 chars transmitted from receiver
A μ value of 0.063 < 0.5, indicating #8 occurrence of the probability of a packet loss event
Data packet containing 12 chars transmitted from sender
Data packet containing 12 chars transmitted to receiver
Acknowledgement packet containing 0 chars transmitted from receiver
Acknowledgement packet containing 0 chars transmitted to sender
Data packet containing 0 chars transmitted from sender
A μ value of 0.3987 < 0.5, indicating #9 occurrence of the probability of a packet loss event
Data packet containing 0 chars transmitted from sender
A μ value of 0.0769 < 0.5, indicating #10 occurrence of the probability of a packet loss event
Data packet containing 0 chars transmitted from sender
A μ value of 0.4844 < 0.5, indicating #11 occurrence of the probability of a packet loss event
Data packet containing 0 chars transmitted from sender
Data packet containing 0 chars transmitted to receiver
Acknowledgement packet containing 0 chars transmitted from receiver
Acknowledgement packet containing 0 chars transmitted to sender
All TCP transmissions are complete

Successful transmission of 4 packets in 11.06 seconds:
 - 20 transmissions sent 
 - 20 transmissions received
 - 11 packets lost at a probability of 50.0%
 - 1 bit errors at a probability of 10.0%

Connection #1 has successfully closed
Connection #2 has successfully closed
Socket #1 has successfully closed
Socket #2 has successfully closed
Socket #3 has successfully closed
Socket #4 has successfully closed
TCP socket program: Channel has completed transmitting.

Receiver program output

Waiting for connection...
Out port for channel connected...
Listening for a socket connection to channel...
In port for channel connected...
All sockets are connected

Transmission status report: 

Data packet #1 has successfully transmitted. 12 char data packet contents:

Hello World!

Data packet #2 has successfully transmitted. 0 char data packet contents:

<empty packet>

Successful transmission of 2 packets:
 - 7 transmissions sent 
 - 7 transmissions received

received_input.txt has successfully closed
Connection #1 has successfully closed
Socket #1 has successfully closed
Socket #2 has successfully closed
TCP socket program: Receiver has completed transmitting.

Sender program output

Waiting for connection...
Out port for channel connected...
Listening for a socket connection to channel...
In port for channel connected...
All sockets are connected

Transmission status report: 

Data packet #1 has successfully transmitted after 9 attempt(s). 12 char data packet contents:

Hello World!

Data packet #2 has successfully transmitted after 4 attempt(s). 0 char data packet contents:

<empty packet>

Successful transmission of 2 packets:
 - 13 transmissions sent 
 - 2 transmissions received

input.txt has successfully closed
Connection #1 has successfully closed
Socket #1 has successfully closed
Socket #2 has successfully closed
TCP socket program: Sender has completed transmitting.