Citrix Netscaler is a very good system for load balancing, if you want to have an enterprise system and not do this in another way with Apache for free. It also provide a access gateways for ICA sessions. It’s based on FreeBSD but it has no nagios-plugins inside like other firewall system e. g. GenuGate firewall systems. So the only way to monitor such device is over SNMP. There are some plugins on Monitorexchange to watch over CPU, Mem, Connections and Disks.
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