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What is incorrect? &nbsp;I know that most implementations will fire an ACK regardless after 200ms. My question is, does the receiver always go into delayed ack mode upon receiving a segment.<br />

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What is incorrect?  I know that most implementations will fire an ACK regardless after 200ms. My question is, does the receiver always go into delayed ack mode upon receiving a segment.


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Does anyone know? &nbsp;<br />

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I know - ack/retry algorithm is much more complex than you think.<br />
<br />
<a href="http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ip.htm#xtocid16" rel="ugc">http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ip.htm#xtocid16</a><br />
<br />

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I know - ack/retry algorithm is much more complex than you think.

http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ip.htm#xtocid16 [http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/ip.htm#xtocid16]



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That's not what I'm talking about. &nbsp;My question is in regards to the delayed acknowledgement algorithm, not retransmission or sliding window. I know what those are.<br />
<br />
I was trying to get confirmation on the delayed ack algorithm. <br />
<br />
A host is supposed to ACK if:<br />
<br />
-it has received 2 full size MSS packets that have not yet been acknowledged. <br />
<br />
-If 200ms has passed since receiving a packet<br />
<br />
-If data is immediately ready for transmission to sender, upon receiving a segment (such as in interactive sessions ie: telnet)
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That's not what I'm talking about.  My question is in regards to the delayed acknowledgement algorithm, not retransmission or sliding window. I know what those are.

I was trying to get confirmation on the delayed ack algorithm.

A host is supposed to ACK if:

-it has received 2 full size MSS packets that have not yet been acknowledged.

-If 200ms has passed since receiving a packet

-If data is immediately ready for transmission to sender, upon receiving a segment (such as in interactive sessions ie: telnet)

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I'm trying to find the rules out when a host will ACK.<br />
Tell me if this is correct. <br />
<br />
A host will ACK when:<br />
<br />
-it has received 2 full sized packets and none have been acknowledged<br />
<br />
-the delayed timer has gone off<br />
<br />
-it has data ready in its send buffer<br />
<br />

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I'm trying to find the rules out when a host will ACK.
Tell me if this is correct. 

A host will ACK when:

-it has received 2 full sized packets and none have been acknowledged

-the delayed timer has gone off

-it has data ready in its send buffer



When will a host ACK?

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