tcpdump filter for active probing

["J S" <geekreader () gmail com>]

Hello-
I am trying to setup active tcp probing b/w two nodes, however I am facing
difficulty in setting up tcpdump filter. I would like to capture the tcp
data packets which I am generating.
when I use this filter
'tcpdump src host SRC and  dst host DST and  tcp [tcpflags]=0'
 the filter didn't capture any packets.

so how do I capture data packets and ignore tcp flag packets.

Thanks in advance
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