In network management there might be problems in maintaining the network. These problems must be fixed quickly. It may be a malfunction or connections in the network. Event correlation is performed in a network management to notify that a device has just rebooted or a network link is currently down.
Network provides data about Operating systems, Servers, Applications log errors, Firewalls, Network routers and switches. All these devices and management programs receive and relay messages from other network systems, leading to duplicate alerts. A single failure or problem can generate a blizzard of event messages.
Event correlation simplifies and speeds the monitoring of network events by consolidating alerts and error logs into a short, easy-to-understand package. Some of the technologies and operations associated with event correlation:
Real-time event correlation is all about proactively dealing with threats. Protecting network data from attackers involves detecting security threats at its early stage. Security investigators need to determine whether a suspicious event or chain of security events that had happened on the network is a potential security threat or not.
EventLog Analyzer’s correlation engine
The two technologies those are associated with event correlation:
ü Stateless correlation: when the correlation engine does not use its current state for the decision. It is usually limited to filtering.
ü Stateful correlation: when the correlation engine works with a sliding window of events and can match the latest event against any other event in the window as well as its own state.
The central unit of information for any event correlation engine is the event. Events can be viewed as a generalized log records produced by various agents including standard UNIX syslog. As such they can be related to any significant change in the state of the operating system or application. Events can be generated for not only for problems but for successful completions of scheduled tasks.
Event correlation is one of the most important parts of event processing flow. Proper event correlation and filtering is critical to ensuring service quality and the ability to respond rapidly to exceptional situations. The key to this is having experts encode their knowledge about the relationship between event patterns and actions to take.