With each iteration, open-source network management tools get better. OpenNMS, Zenoss Core, NetXMS and Sensu Core deliver comprehensive monitoring, flexible reporting, cross-platform support and more.
Nagios Core is open source, free and has good documentation but could use a streamlined install process, updated Web interface and better configuration options.
We found all four products to be capable network monitoring tools that performed well in our basic tasks such as checking for host availability and measuring bandwidth usage. Beyond the basics, there were quite a few differences in terms of features, granularity and configuration options.
Five commercial Linux versions feature easy install, solid management tools and cloud integration.
Email managers have a lot at stake. After all, the volume of global electronic messages sent via email dwarfs all other forms of electronic communication, including social networking. Since the inception of electronic mail, which, according to some Internet historians, can be traced to a small mainframe app called 'MAILBOX' from the mid-1960s, human-to-human messages have been created, transmitted and stored in electronic format. But early email administrators could hardly have envisioned the complexity of current email infrastructure and the concomitant maze of technical, security, business and regulatory challenges.
If your IPv6 strategy is to delay implementation as long as you can, you still must address IPv6 security concerns right now.