>IMHO you can only monitor a network link. To avoid checking only one IP, i use a modified version of fping.monitor (called icmp.monitor) with an option -l for link check. With -l the monitor only fails, if no IP replies at all.
Well, you could also check the state of the physical network card, the speed (10 or 100), the duplex (half or full), the number of collisions, the number of packets sent or received, the state of the interface (up or down), ... the problem is just that the tools for doing this and their responses vary from one unix to another ...
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