5.1.7. Interface status and statistics

The state of the configured interfaces is indicated by coloured leds in front of the name of the interface:

  • Green bar: the interface is up (on the host or on all cluster nodes).

    In case of Keepalived interface: the interface is up only in one cluster node.

  • Yellow bar: the interface is up on some nodes, but not on all of them.

    In case of Keepalived interface: the interface is up on multiple nodes, but not on all of them.

  • Red bar: the interface is down on all nodes.

    In case of Keepalived interface: the interface is up on all nodes.

  • Blue bar: Unknown.

The state of the interface is automatically updated periodically. The frequency of the update can be configured in Edit > Preferences > General > Program status.

Status update can also be requested manually from the local menu of the interface:

Hovering the mouse over an interface displays a tooltip with status information and detailed statistics about the interface. The following status information is displayed:

  • State: It is the status of the interface. The possible values are: Up, Down, Unknown.

  • flags: These are the flags applicable to the interface. The possible values are: UP, BROADCAST, MULTICAST, PROMISC, NOARP, ALLMULTI, LOOPBACK.

  • mtu: Maximum Transmission Unit (MTU) is the maximum size of a packet (in bytes) allowed to be sent from the interface.

  • qdisc: It is the queuing discipline. For details, see the Traffic Control manual pages (man tc).

The statistics about the traffic handled by the interface is divided into Received and Sent sections, relevant for the received/sent packets, respectively.

  • Bytes: It is the amount of data received.

  • Packets: It is the number of packets received.

  • Errors: It is the number of errors encountered.

  • Dropped: It is the number of dropped packets.

  • Overruns: It is the number of overruns. Overruns usually occur when packets come in faster than the kernel can service the last interrupt.

  • Mcast: It is the number of multicast packets received.

  • Bytes: It is the amount of data sent.

  • Packets: It is the number of packets sent.

  • Errors: It is the number of errors encountered.

  • Dropped: It is the number of dropped packets.

  • Carrier: It is the number of carrier losses detected by the device driver. Carrier losses are usually the sign of physical errors on the network.

  • Collsns (Collisions): It is the number of collisions encountered.

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