what open source app is good to monitor & control internet usage in an office?
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Start your 7-day free trialMonitoring will be done by SNMP based Network Monitoring System. Below are some of the options;
Ntop www.ntop.org LAMP based NMS
Munin munin-monitoring.org LAMP based NMS
Bandwidthd bandwidthd.sourceforge.net
ZenOSS www.zenoss.com LAMP based NMS
Nagios www.nagios.org LAMP based NMS
JFFNMS www.jffnms.org LAMP based NMS
OpenNMS www.opennms.org LAMP based NMS
Zabbix www.zabbix.com LAMP based NMS
Hyperic HQ www.hyperic.com LAMP based NMS
Etherape etherape.sourceforge.net LAMP based NMS
GroundWork www.groundworkopensource.com LAMP based NMS
NAV metanav.uninett.no LAMP based NMS
Netdisco netdisco.org LAMP based NMS
MRTG oss.oetiker.ch/mrtg RRDTool
Cacti www.cacti.net RRDTool
Recommendations are to use something like Cacti or Ntop.
For controlling the bandwidth, the ideal way to do is using some UTM device (Cisco, Juniper, Fortinet, SonicWALL) but if you are inclined towards open source soft solution, then install Squid as a transparent proxy.
http://www.tldp.org/HOWTO/TransparentProxy.html
http://www.cyberciti.biz/tips/linux-setup-transparent-proxy-squid-howto.html
You will need a machine with two NICs to make it a transparent proxy but it requires linux skills to manage it. Untangle as mentioned above is easy to manage.
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Squid can be managed through webmin even, to make it somewaht easier to manage if that is something that would be interesting for you.
If you're looking for something more or less open source, you can take a look at untangle, not all of the features are free though...
Another option is to install pfsense and then install the squid proxy package on it, and just use it as a proxy/content filtering box instead of pure firewalling.