NetMon is a network interface fail-over facility, which ensures that the most common single point of failure, the NIC, is eliminated. Network interfaces are continually monitored and standby interfaces activated if a problem is detected.

NetMon sends out packets on each interface it is monitoring and waits for a response from a defined target. When responses are received NetMon infers that the interface is up and running, even if not configured plumbed in. If a response fails to be received when expected NetMon can infer that the interface has in some way failed.

NetMon can operate interfaces in redundant/failover mode or in active-active mode, depending on an administrator's needs.

NetMon is able to use multiple types of test methodologies including ARP request/response, ntp, time, echo and icmp echo request/reply (ping). NetMon can be configured in a mode to use only a single IP address on all interfaces.

NetMon can operate both in conjunction with RSF-1 (as a network monitoring agent) or as a stand-alone network monitoring facility.