NAME

ovs-tcpdump - Dump traffic from an Open vSwitch port using 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

--help

Prints a brief help message to the console.

-V

--version

Prints version information to the console.

--db-sock

The Open vSwitch database socket connection string. The default is unix:/var/run/openvswitch/db.sock

--dump-cmd

The command to run instead of tcpdump.

-i

--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 miINTERFACE

SEE ALSO

ovs-appctl(8), ovs-vswitchd(8), ovs-pcap(1), ovs-tcpundump(1), tcpdump(8), wireshark(8).