Understanding TCP Windowing,
Understanding TCP Windowing,
I would like to know if TCP windowing works at the Router level or Switch Level or just between computers.
for instance if computer A is receiving Traffic from Computer B, then Computer A can tell Computer B to stop sending traffic if it cannot process all the traffic it has received. It can also tell Computer B to send more traffic if it is not busy enough ...
Any Expert to Elaborate on that ?
Thank you
I would like to know if TCP windowing works at the Router level or Switch Level or just between computers.
for instance if computer A is receiving Traffic from Computer B, then Computer A can tell Computer B to stop sending traffic if it cannot process all the traffic it has received. It can also tell Computer B to send more traffic if it is not busy enough ...
Any Expert to Elaborate on that ?
Thank you
To elaborate a little on what Doc notes above.
Windowing will establish the number of packets that one host will send to another in a given timeframe before expecting to receive an ACK of those packets. It will also have some control over the size of those packets though this functionality is established in the initial link negotiation and actively managed higher in the stack in congestion management, only communicated within flow control.
Windowing will establish the number of packets that one host will send to another in a given timeframe before expecting to receive an ACK of those packets. It will also have some control over the size of those packets though this functionality is established in the initial link negotiation and actively managed higher in the stack in congestion management, only communicated within flow control.
ASKER
Thank you Guys, when you said Host , did you mean a computer, a router, a switch ?
If I am not wrong, devices that use TCP including computers, will go through Sync , Ack, Syn Ack handshake .
is TCP windowing part of this 3 way handshake ?
What I meant by TCP windowing is, the receiver of TCP packets, can signal the sender to stop sending more packets when the receiver is too busy processing the previous packets, and it will signal the sender to send more packets when the receiver is not busy..
However I am not sure if computers can assume this role of sender/receiver TCP windowing communication, or just routers and switches are able to do that
If I am not wrong, devices that use TCP including computers, will go through Sync , Ack, Syn Ack handshake .
is TCP windowing part of this 3 way handshake ?
What I meant by TCP windowing is, the receiver of TCP packets, can signal the sender to stop sending more packets when the receiver is too busy processing the previous packets, and it will signal the sender to send more packets when the receiver is not busy..
However I am not sure if computers can assume this role of sender/receiver TCP windowing communication, or just routers and switches are able to do that
host = end device - generally a server or workstation but can include a printer, etc.
hand shake is syn, syn ack, ack, ack, ack, ack, ack, ack, ack.........
the ack is what says, "send more data". If an ACK is not received inside window, then transmission pauses until a transmit condition is met. E.g. re-negotiation of window/connection, loss of carrier, loss of connection/reset.
The transmission can also be interrupted by higher level protocol errors such as HTTP 503 - Server Busy
hand shake is syn, syn ack, ack, ack, ack, ack, ack, ack, ack.........
the ack is what says, "send more data". If an ACK is not received inside window, then transmission pauses until a transmit condition is met. E.g. re-negotiation of window/connection, loss of carrier, loss of connection/reset.
The transmission can also be interrupted by higher level protocol errors such as HTTP 503 - Server Busy
ASKER
OK so TCP windowing in this case is a function of Computer, printer,etc..., but not Switch or Router . Correct ?
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only the two end devices will negotiate windowingOK
ASKER
Thank you Guys!
TCP window scaling is under the control of the communicating hosts as part of the TCP protocol. However, it is entirely separate from traffic control and window size modulation has little effect on traffic flow.