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OVS-L3PING(8) Open vSwitch OVS-L3PING(8)


ovs-l3ping - check network deployment for L3 tunneling problems


ovs-l3ping -s <TunnelRemoteIP>,<InnerIP>[/<mask>] -t <tunnelmode>

ovs-l3ping -s <TunnelRemoteIP>,<InnerIP>[/<mask>][:<ControlPort>] -t <tunnelmode>

ovs-l3ping -c <TunnelRemoteIP>,<InnerIP>[/<mask>],<RemoteInnerIP> -t <tunnelmode>

ovs-l3ping -c <TunnelRemoteIP>,<InnerIP>[/<mask>][:<ControlPort>[:<DataPort>]],<RemoteInnerIP>[:<ControlPort>[:<DataPort>]] [-b <targetbandwidth>] [-i <testinterval>] -t <tunnelmode>

ovs-l3ping -h | --help

ovs-l3ping -V | --version


The ovs-l3ping program may be used to check for problems that could be caused by invalid routing policy, misconfigured firewall in the tunnel path or a bad NIC driver. On one of the nodes, run ovs-l3ping in server mode and on the other node run it in client mode. The client and server will establish L3 tunnel, over which client will give further testing instructions. The ovs-l3ping client will perform UDP and TCP tests. This tool is different from ovs-test that it encapsulates XML/RPC control connection over the tunnel, so there is no need to open special holes in firewall.

UDP tests can report packet loss and achieved bandwidth for various datagram sizes. By default target bandwidth for UDP tests is 1Mbit/s.

TCP tests report only achieved bandwidth, because kernel TCP stack takes care of flow control and packet loss.

Client Mode

An ovs-l3ping client will create a L3 tunnel and connect over it to the ovs-l3ping server to schedule the tests. <TunnelRemoteIP> is the peer’s IP address, where tunnel will be terminated. <InnerIP> is the address that will be temporarily assigned during testing. All test traffic originating from this IP address to the <RemoteInnerIP> will be tunneled. It is possible to override default <ControlPort> and <DataPort>, if there is any other application that already listens on those two ports.

Server Mode

To conduct tests, ovs-l3ping server must be running. It is required that both client and server <InnerIP> addresses are in the same subnet. It is possible to specify <InnerIP> with netmask in CIDR format.


One of -s or -c is required. The -t option is also required.

  • -s <TunnelRemoteIP>,<InnerIP>[/<mask>][:<ControlPort>] or --server <TunnelRemoteIP>,<InnerIP>[/<mask>][:<ControlPort>]

    Run in server mode and create L3 tunnel with the client that will be accepting tunnel at <TunnelRemoteIP> address. The socket on <InnerIP>[:<ControlPort>] will be used to receive further instructions from the client.

  • -c <TunnelRemoteIP>,<InnerIP>[/<mask>][:<ControlPort>[:<DataPort>]],<RemoteInnerIP>[:<ControlPort>[:<DataPort>]] or --client <TunnelRemoteIP>,<InnerIP>[/<mask>][:<ControlPort>[:<DataPort>]],<RemoteInnerIP>[:<ControlPort>[:<DataPort>]]

    Run in client mode and create L3 tunnel with the server on <TunnelRemoteIP>. The client will use <InnerIP> to generate test traffic with the server’s <RemoteInnerIP>.

  • -b <targetbandwidth> or --bandwidth <targetbandwidth>

    Target bandwidth for UDP tests. The <targetbandwidth> must be given in bits per second. Use postfix M or K to alter the target bandwidth magnitude.

  • -i <testinterval> or --interval <testinterval>

    How long each test should run. By default 5 seconds.

  • -t <tunnelmode> or --tunnel-mode <tunnelmode>

    Specify the tunnel type. This option must match on server and client.

  • -h or --help

    Prints a brief help message to the console.

  • -V or --version

    Prints version information to the console.


On host start ovs-l3ping in server mode. This command will create a temporary GRE tunnel with the host and assign as the inner IP address, where client will have to connect:

ovs-l3ping -s, -t gre

On host start ovs-l3ping in client mode. This command will use as the local inner IP address and will connect over the L3 tunnel to the server’s inner IP address at

ovs-l3ping -c,, -t gre


ovs-vswitchd(8), ovs-ofctl(8), ovs-vsctl(8), ovs-vlan-test(8), ovs-test(8), ethtool(8), uname(1).


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October 20, 2021 2.15