SSH - [ACK] TCP CHECKSUM INCORRECT

[Jason Fraioli]

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!

[mchin345]

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