NIDS can analyze data flow throughout the network to determine where a problem may be taking place. For example, if you had a specific protocol that was known to have 50% packet loss during normal operation and a packet loss percentage significantly different from the norm is detected, this would trigger an alarm or alert enabling you to investigate the problem further. This is where an IDS has been programmed to detect anomalies in protocols that are otherwise benign when working normally. Network Intrusion Detection Systems use various types of protocols to monitor for threats on your network. For example, if there is no heavy traffic on the network, but packets are still being transmitted at a high rate of speed, this could indicate suspicious activity. An IDS can compare normal traffic rates, with those being transmitted at any one time across the network, to detect anything out of the ordinary. This may be a configuration option that you specify when installing a traffic monitoring system on your network. The total packets per second is a common technology used by a NIDS to monitor for threats on your network. The NIDS will analyze this information for suspicious activity or malicious behavior. Information in the header can include source and destination IP addresses, ports, protocol types, etc. Packet headers contain specific information about the packet being transmitted across your network. Network Intrusion Detection Systems use one or more technologies to analyze for threats on your network. Technologies That Can Be Monitored by NIDS However, in some cases, it may monitor packets as they pass through a firewall from one network to another or it could monitor activity on an entire host running multiple services and applications at once. In most cases, a host-based IDS is used only to monitor traffic within the local host or a particular service or application.
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Host-based Intrusion Detection Systemsįor this type of system, the sensor is software that monitors network traffic from within a single host on the network. For example, a router may have a sensor installed to monitor traffic that passes through the router or a switch could have a sensor that monitors traffic as it passes from one port to another. The sensor can be located at various points on the network, depending on where it is needed. The sensor monitors and analyzes network traffic for malicious behavior. Network sensors are often dedicated devices or applications that run exclusively as NIDS. There are two types of Network Intrusion Detection Systems: Network Sensors It can be used to identify possible security breaches on a system including sniffers and attacks on services such as HTTP/S, SMB, SSH etc. Packet headers, statistics, and protocol/application data flows are analyzed to determine whether malicious or anomalous activity has taken place. NIDS works by examining a variety of data points from different sources within the network.
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