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===========
ovs-tcpdump
===========
Synopsis
========
``ovs-tcpdump -i <port> <tcpdump options>...``
Description
===========
``ovs-tcpdump`` creates switch mirror ports in the ``ovs-vswitchd``
daemon and executes ``tcpdump`` to listen against those ports. When
the ``tcpdump`` instance exits, it then cleans up the mirror port it
created.
``ovs-tcpdump`` will not allow multiple mirrors for the same port. It
has some logic to parse the current configuration and prevent
duplicate mirrors.
The ``-i`` option may not appear multiple times.
It is important to note that under Linux-based kernels, tap devices do
not receive packets unless the specific tuntap device has been opened by an
application. This requires ``CAP_NET_ADMIN`` privileges, so the
``ovs-tcpdump`` command must be run as a user with such permissions (this
is usually a super-user).
Options
=======
* ``-h`` or ``--help``
Prints a brief help message to the console.
* ``-V`` or ``--version``
Prints version information to the console.
* ``--db-sock <socket>``
The Open vSwitch database socket connection string. The default is
``unix:<rundir>/db.sock``.
* ``--dump-cmd <command>``
The command to run instead of ``tcpdump``.
* ``-i`` or ``--interface``
The interface for which a mirror port should be created, and packets
should be dumped.
* ``--mirror-to``
The name of the interface which should be the destination of the mirrored
packets. The default is ``mi<port>``.
* ``--span``
If specified, mirror all ports (optional).
See Also
========
``ovs-appctl(8)``, ``ovs-vswitchd(8)``, ``ovs-pcap(1)``,
``ovs-tcpundump(1)``, ``tcpdump(8)``, ``wireshark(8)``.
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