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How can I REALLY turn off tcp stream reassemble?

asked 2022-10-17 14:33:33 +0000

zsoka gravatar image

I want to see the tcp segments sent from my machine. I started a http POST request and saw only some (10, 20, or even more) reassembled segments displayed as a http continuation line. Of course, I switched off all the reassemble options in the protocol preferences of ip, tcp and http. The segments are surely sent one by one, as I can see from the tcp acks coming back from the server.

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How about disabling the HTTP dissector?

Jaap gravatar imageJaap ( 2022-10-17 16:11:10 +0000 )edit

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answered 2022-10-17 18:12:23 +0000

Chuckc gravatar image

I want to see the tcp segments sent from my machine.

If the capture is made on the sender and it does TCP offload or on the receiver and it does TCP offload, then the individual segments are created/rolled up at a level lower than Wireshark captures. To see what's on the wire, the best place to look/capture is in the middle on the wire.

Background info:
Wireshark Wiki - Offloading
Packet Foo - The drawbacks of local packet captures
Wireshark Wiki - Ethernet capture setup
Packet Foo - The Network Capture Playbook Part 1 – Ethernet Basics

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Thank you very much! Turning off Large Send Offload (on Win10) seems to solve the problem.

zsoka gravatar imagezsoka ( 2022-10-18 12:41:57 +0000 )edit

Turning off Large Send Offload (on Win10) seems to solve the problem.

And introduces a performance issue. So turn it back on when finished capturing.

André gravatar imageAndré ( 2022-10-18 18:52:45 +0000 )edit

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Asked: 2022-10-17 14:33:33 +0000

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Last updated: Oct 17 '22