Problems capturing packets on an interface

[António Richard Silva <silva.antonio () gmail com>]

Hi, I am having problems capturing some packets using tcpdump.
At the application level I am sending and receiving packets but tcpdump
does not capture any data.
There are no packets dropped by the kernel
I have tried reducing the packet data captured (-s option) to different
labels without any changed and also saving the captured packets into a file
for later inspection.
Here are the different commands performed without any result:
 tcpdump -i eth0 src 10.112.42.209
tcpdump -i eth0 -s 100 -w capture_start.pcap
Regards,
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