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SSH - [ACK] TCP CHECKSUM INCORRECT

Jason Fraioli
Level 3
Level 3

‎03-05-2008 11:18 AM - edited ‎03-05-2019 09:34 PM

25 24.547558 src_ip dst_ip TCP 12898 > ssh [ACK] Seq=1013 Ack=868 Win=63645 [TCP CHECKSUM INCORRECT] Len=0

Using a network analyzer to see what's going on in my network and ran across this when I ssh'd into a switch. Any idea why I would be getting this?

I am even getting it on some http traffic

73 43.997420 src_ip dst_ip TCP 12899 > http [ACK] Seq=4146 Ack=10221 Win=64512 [TCP CHECKSUM INCORRECT] Len=0

Thanks!

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mchin345
Level 6
Level 6

‎03-11-2008 11:27 AM

May be the third party device rejects your TCP syn or disable the CEF on particular interface.

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