tcpdump: packets dropped by kernel 25. Jun 2008

tcpdump is a really nice tool, but it may render useless with it’s default settings.

$ sudo tcpdump -i en1

In my case led to

80 packets captured
7705 packets received by filter
6794 packets dropped by kernel

To solve the issue I had to turn off address translation.

$ sudo tcpdump -i en1 -n

Now the results look as expected.

6941 packets captured
7011 packets received by filter
0 packets dropped by kernel
 

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