When does TCP decide not to ACK every packet

asked 2019-09-30 09:13:56 +0000

jlpanes2493
1 ●1 ●1

Hi,

Ive read that at the start of a connection, TCP will send an ACK for every packet it receives thus effectively doubling the CWND of the sender. My question is when does the receiver decide to NOT send an ACK for every packet received?

answered 2019-09-30 18:25:14 +0000

Jasper
24103 ●5 ●111 ●292 Düsseldorf, Germany

The ACK frequency is basically something the TCP stack decides, so it depends on the operating system, the network stack, and it's settings.

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So im assuming its somewhere in the sysctl config for linux or some registry value for windows. Thanks Jasper.

jlpanes2493 ( 2019-10-01 07:53:19 +0000 )edit

For some background info on the why of not ACKing every packet, look at the Wikipedia page for "Delayed Acknowledgements"

SYN-bit ( 2019-10-01 22:09:22 +0000 )edit

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