Anasil is a software network analyzer and protocol decoder for distributed Ethernet networks. System architecture is based on a remote Agent modules what enables IT managers to remotely monitor and manage a multi-segment networks from one central console. Anasil consists of three modules: network discovery and mapping, network traffic monitoring and frame capturing, network event recording and alerting. Anasil delivers detailed and sophisticated statistics on a network traffic and can capture and decode defined network packages. Additionally, the build-in, programmable package decoder allows to analyze frames of not only popular protocols, but also the ones defined by a user. Anasil has been designed as an application operating as MMC (Microsoft Management Console) plug-in, which is a standard platform for all administrative tools, according to the Microsoft guidelines. Each module is a separate snap-in, which enables you to attach Anasil to MMC tools which are created by network supervisors. It is also possible to attach the program easily to the subsequent modules which our company is going to launch onto the market.