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When does TCP decide not to ACK every packet

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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?

jlpanes2493

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

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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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Jasper

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

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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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