OVS-TCPDUMP - Online Linux Manual PageSection : 8
Updated : Feb 21, 2021
Source : 2.15
Note : Open vSwitch

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NAMEovs-tcpdump − Dump traffic from an Open vSwitch port using tcpdump

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SYNOPSISovs−tcpdump −i <port> <tcpdump options>...

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DESCRIPTIONovs−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).

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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).

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SEE ALSOovs−appctl(8), ovs−vswitchd(8), ovs−pcap(1), ovs−tcpundump(1), tcpdump(8), wireshark(8)​.

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AUTHORThe Open vSwitch Development Community

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COPYRIGHT2021, The Open vSwitch Development Community 0

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Johanes Gumabo

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