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This directory contains third-party software that may be useful fordebugging.tcpdump-------The "ofp-tcpdump.patch" patch adds the ability to parse OpenFlowmessages to tcpdump. These instructions assume that tcpdump 4.3.0is going to be used, but it should work with other versions that are notsubstantially different. To begin, download tcpdump and apply thepatch: wget http://www.tcpdump.org/release/tcpdump-4.3.0.tar.gz tar xzf tcpdump-4.3.0.tar.gz ln -s tcpdump-4.3.0 tcpdump patch -p0 < ofp-tcpdump.patchThen build the new version of tcpdump: cd tcpdump ./configure makeClearly, tcpdump can only parse unencrypted packets, so you will need toconnect the controller and datapath using plain TCP. To look at thetraffic, tcpdump will be started in a manner similar to the following: sudo ./tcpdump -s0 -i eth0 port 6633The "-s0" flag indicates that tcpdump should capture the entire packet.If the OpenFlow message is not received in its entirety, "[|openflow]" will be printed instead of the OpenFlow message contents.The verbosity of the output may be increased by adding additional "-v"flags. If "-vvv" is used, the raw OpenFlow data is also printed inhex and ASCII.