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TCP packets

Posted on 2015-02-03
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Last Modified: 2015-02-18
We are currently using a packet generator and need to know what the largest packet for TCP version 4 is.  I read somewhere it was 64k, is that true?

Second how can we make the packets smaller, we have a project and we need to find the cutoff point as to where it breaks.
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Question by:Squidsupport
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Dan McFadden earned 500 total points
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Technically 64K (65536) bytes.  But you will need to know your network setup and configuration because other lower layer networking device can (and most likely will) limit that size.  Take, for instance the NIC MTU, the max is 1500 bytes, typical efficient setting is 1460 or so.

Also, the packet size also incorporates header information, so your data payload is the difference of the total packet size minus the mandatory and optional headers in the packet.

I would assume that the packet generator has documentation to explain the operation of the tool.  I would look into the user manual and research the various options available.  (Please excuse the RTM comment, but you didn't mention what tools you are using).

Also, what are you trying to break in IIS?

Dan
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