Description of problem:
Need tcpdump to support new libpcap nanosecond timestamping
libpcap now supports nanonsecond timestamps via BZ below
At  you can find tcpdump built against libpcap containing high precision timestamp patches. Please note -P switch and also switches -j/-J.
I sent patches for this upstream and topic is discussed here . Should be merged soonish.
Arghh...Link to the upstream discussion.
http://pkgs.devel.redhat.com/cgit/rpms/tcpdump/commit/?h=rhel-6.7&id=9a37001a7e527c3883d1c2a0fb90cd8a71a3bfad -> MODIFIED
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.