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If you Google "open source network management" the first hit is OpenNMS. It has been around for over 10 years, and has a long track record of managing enterprise networks. At one site they are collecting 1.2 million data points every 5 minutes. At another they are parsing 125,000 syslog messages a minute (for over 8 hours at a time). In Italy there is a carrier where each device has over 32,000 virtual interfaces, yet OpenNMS can discover and handle them all. Another carrier in Switzerland is monitoring nearly 70,000 discreet devices with a single instance. And Papa John's Pizza has almost 3000 OpenNMS remote monitors all running at the same time - one in each of their stores - talking back to a single instance of OpenNMS.
It is truly enterprise grade product that is 100% free and open source software, without a separate "enterprise edition" priced per node.
Note that as one of the project maintainers I'm a bit biased (grin)
OpenNMS all the way. Completely customizable and plays well with 3rd party software such as ticketing systems and Rancid. The Jasper reports are eye-candy. Escalations and notifications don't blow up my inbox. The Provisioning policies and API reduces cost of ownership. The software is free and commercial support is available through the developers. All this Power comes with a learning curve, which once overcome you will realize why OpenNMS truly is considered "Enterprise Grade".
OpenNMS for sure. I'm an OGP member and I'm working on OpenNMS until 2002. Tarus, the interfaces on the Italian carrier are 120.000 on each node and we monitor 30 of such nodes giving the end user a stright picture of how the network is working. Finally let me say that the Jasper Report Integration was the last feature to really say "OpenNMS is the best Enterprise Grade open source (truly) Infrastructure Monitoring System"
Pardon my ignorance but does WireShark not fit in Network Monitoring Application category ?
Network Monitoring and Network Traffic Analyzing are two seperate things.
Network Monitoring denotes checking Network services for Availability and sometimes performance. Pinging something and making sure it is up, paging out if it is not, is Network Monitoring.
Network Traffic Analyzing is a subset of this, but is used primarily for finding bottlenecks or broken infrastructure, such as bad switches or wires. Wireshark is a traffic analyzer and is considered a troubleshooting tool, not a monitoring tool.