sentence: polling routers , switches and firewalls using snmp monitoring servers and operating systems ( processor load , disk usage , syslog , windows event logs ) extensible and open api which allows using languages such as perl , c++ , java , php , python network configuration & change management for network devices such as routers , firewalls support for ipv6 company background zyrion ( pronounced '' zeye-ree-on '' ) , was spun out of netscout systems by the core team of fidelia technology ( acquired by network general corporation in 2006 , which in turn was purchased by netscout ) .