Why is this TCP SYN/ACK packet malformed?

asked 2018-03-09 13:03:07 +0000

TiMeX
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So I've been trying to make a TCP-Stack in VHDL but I've run into the problem that the SYN/ACK packet I'm sending for the initial handshake is malformed according to Wireshark and I can't seem to figure out why.

I've uploaded the wireshark file to my dropbox:

https://www.dropbox.com/s/ggvfmb442i0...

It's packet No. 15.

There must be some error in how the packet is put together since Wireshark says it's not a full TCP-Header even though all the data is there.

Any help would be much appreciated.

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answered 2018-03-09 14:06:59 +0000

Jaap

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Your IP length field is wrong, it says 40, but should be 52, as in the SYN packet (#14)

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thank you so much! I completely forgot changing that after I did some changes

TiMeX ( 2018-03-09 20:56:34 +0000 )edit

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Asked: 2018-03-09 13:03:07 +0000

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Last updated: Mar 09 '18

Why is this TCP SYN/ACK packet malformed? edit