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bb1329ec39
The recently introduced use of libtool, in commit 38b7a52b61
(openvswitch: Use libtool and allow building shared libs) broke the
tcpdump patch. This fixes the problem.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Justin Pettit <jpettit@nicira.com>
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.