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).