AIX, HP-UX, and Solaris
Tests the network card and network link. Pings the network hosts or broadcast address of the interface to generate traffic on the network. Counts the number of packets passing through the device before and after the address is pinged. If the count decreases or remains the same, the resource is marked faulted.
If the NetworkHosts list is empty, or the ping test fails, the agent sends a ping to the device's broadcast address to generate network traffic. The agent checks for any response to the broadcast request. If there is no reply to the broadcast ping, the resource is marked offline.
Linux
If the NIC maintains its connection status, the agent uses MII to determine the status of the resource.
If the NIC does not maintain its connection status, the agent verifies that the NIC is configured. The agent then sends a ping to all the hosts that are listed in the NetworkHosts attribute. If the ping test is successful, it marks the NIC resource online.
If the NetworkHosts attribute list is empty, or the ping test fails, the agent counts the number of packets that the NIC received. The agent compares the count with a previously stored value. If the packet count increases, the resource is marked online. If the count remains unchanged, the agent sends a ping to the broadcast address of the device to generate traffic on the network.
The agent counts the number of packets that the NIC receives before and after the broadcast. If the count increases, the resource is marked online. If the count remains the same or decreases over a period of five broadcast cycles, the resource is marked offline.
