Though viewing NetFlow data through a terminal is possible, it is tough to parse through all the data on a CLI. NetFlow enables traffic metadata collection as it flows through a device (or interface). We’ll discuss basic features offered by the most popular tools: NetFlow, NetHogs, nload, netstat, and iftp. Some tools are designed to collect network traffic statistics at the interface and device levels, while others allow you to evaluate network traffic at the application level. Usually, these are lightweight command-line utilities that display incoming and outgoing traffic, established network connections, and general network statistics. Tools for monitoring network traffic on a Linux system can help system administrators achieve the goals listed above. On top of bandwidth utilization, network traffic monitoring should be integrated with data visualization, data analysis, and alerting systems to ensure a fast transition from detection to resolution of networking issues. With this knowledge, you can stop processes that consume a high volume of traffic without the need to be active and/or redistribute network resources to applications experiencing problems. It’s useful to know which applications consume the most and the least amount of bandwidth. Outgoing trafficĪnother important metric to monitor is bandwidth utilization by individual processes on your system. This can be useful for mitigating DDoS attacks or finding malware installed locally. For example, network traffic monitoring tools can help identify connections that send abnormal amounts of traffic to your host. Monitoring incoming traffic can help thwart network attacks and maintain the security of your Linux servers (or systems). For example, closing unused ports or restricting port access to a list of known IPs can help reduce possible attack vectors on your Linux systems. Understanding the overall state of your network, including network traffic at the interface and device levels, can provide you with insight into network performance and the security of your system. An effective network monitoring system on Linux servers should be based on three interconnected layers: general network health, incoming traffic, and outgoing traffic. It requires a systematic approach based on clear identification of goals, performance targets, and adherence to security standards. Network traffic monitoring is a crucial component of Linux system administration. This information can be used to distribute resources better. Facilitate capacity planning and resource distribution: Network traffic monitoring can also help identify applications with insufficient resources or excessive resource consumption.Network monitoring tools can help identify traffic flow patterns in your servers and help your team quickly respond to anomalies. Track security anomalies: Traffic spikes originating from remote hosts may indicate the start of DDoS attacks against your servers.These may include disconnections, closed ports, and firewall misconfigurations. Troubleshoot network issues: An efficient network monitoring system can help identify and fix network-related issues.For example, if your application is configured to perform additional traffic-intensive background jobs, this feature can be disabled to free up bandwidth for other applications. Detect network misconfigurations: Finding traffic usage patterns may help to identify misconfigurations at the network and application levels.Network traffic data can be visualized and integrated with alerts, logs, and audit systems to improve the efficiency of how your IT team handles network performance and security issues.
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