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diff --git a/third-party/README.md b/third-party/README.md new file mode 100644 index 000000000..0f0e8a962 --- /dev/null +++ b/third-party/README.md @@ -0,0 +1,35 @@ +This directory contains third-party software that may be useful for +debugging. + +tcpdump +------- +The "ofp-tcpdump.patch" patch adds the ability to parse OpenFlow +messages to tcpdump. These instructions assume that tcpdump 4.3.0 +is going to be used, but it should work with other versions that are not +substantially different. To begin, download tcpdump and apply the +patch: + + 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.patch + +Then build the new version of tcpdump: + + cd tcpdump + ./configure + make + +Clearly, tcpdump can only parse unencrypted packets, so you will need to +connect the controller and datapath using plain TCP. To look at the +traffic, tcpdump will be started in a manner similar to the following: + + sudo ./tcpdump -s0 -i eth0 port 6633 + +The "-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 in +hex and ASCII. |