When there is packet loss, TCP SACK option is disabled on hostEįor the completness of the post, I would like to write a few bits about ACKnowledgement and SACK in TCP as well.Īn ACK segment in TCP means that the party sending the segment has received all bytes up to the number set in ACK field but not including.When there is packet loss, TCP SACK option is enabled on hostE.when there is no packet loss, SACK enabled.We are downloading a wireshark.exe file around ~30MB from debian1 (144.2.3.2) webserver to client PC hostE(60.60.60.60) simply by wget wget Here is the topology used for TCP SACK tests.įirst of all, this big setup isn’t really necessary but I am using this setup for my BGP tests and have found it suitable for a real world scenario. You will also find some stuff about receive segmentation offload, wireshark tips etc. This post was in my mind for sometime but now I have done it after building my big local Internet at home. On this Saturday evening, I have finally completed my work with TCP SACK analysis.
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