{"id":679,"date":"2026-07-20T02:00:26","date_gmt":"2026-07-20T02:00:26","guid":{"rendered":"https:\/\/virtualserversvps.com\/blog\/?p=679"},"modified":"2026-07-20T02:00:26","modified_gmt":"2026-07-20T02:00:26","slug":"vps-traffic-analysis-netflow-ntopng-guide-2026","status":"publish","type":"post","link":"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/","title":{"rendered":"VPS Traffic Analysis with ntopng: Monitor Bandwidth Usage and Detect Anomalies"},"content":{"rendered":"<p class=\"wp-block-paragraph\">If you run a VPS, you know bandwidth matters \u2014 but do you know exactly where it&#8217;s going? ntopng is an open-source network traffic analyzer that gives you real-time visibility into every packet flowing through your server. This guide walks through installing, configuring, and using ntopng on Ubuntu 24.04 to monitor bandwidth usage, identify top talkers, and detect anomalous traffic patterns. Before you begin, <a href=\"https:\/\/virtualserversvps.com\/#providers\">check out our VPS specs comparison<\/a> to make sure your server has enough resources to run ntopng alongside your existing services.<\/p>\n\n<h2 class=\"wp-block-heading\">What Is ntopng?<\/h2>\n\n<p class=\"wp-block-paragraph\">ntopng (next generation top) is a network probe that shows network usage in a web browser. It captures traffic on one or more network interfaces and provides:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Real-time throughput graphs:<\/strong> See current bandwidth usage per interface, protocol, or host.<\/li>\n<li><strong>Top talkers:<\/strong> Identify which IP addresses consume the most bandwidth.<\/li>\n<li><strong>Protocol breakdown:<\/strong> See how much traffic is HTTP, HTTPS, DNS, SSH, etc.<\/li>\n<li><strong>Flow analysis:<\/strong> View active connections with source\/destination, ports, and data volume.<\/li>\n<li><strong>Anomaly detection:<\/strong> Spot unusual traffic spikes, port scans, or data exfiltration attempts.<\/li>\n<li><strong>Historical reports:<\/strong> Review traffic patterns over days, weeks, or months.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Prerequisites<\/h2>\n\n<ul class=\"wp-block-list\">\n<li>Ubuntu 24.04 VPS with at least 2 vCPUs and 2 GB RAM (4 GB recommended for production use).<\/li>\n<li>Root or sudo access.<\/li>\n<li>Port 3000 (or a custom port) open for the ntopng web interface.<\/li>\n<li>A dedicated network interface or the ability to capture traffic on your main interface.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Step 1: Install ntopng<\/h2>\n\n<p class=\"wp-block-paragraph\">ntopng is available in the official ntop repository. Add it and install:<\/p>\n\n<pre class=\"wp-block-code\"><code>wget https:\/\/packages.ntop.org\/apt-stable\/24.04\/all\/apt-ntop-stable.deb\nsudo dpkg -i apt-ntop-stable.deb\nsudo apt update\nsudo apt install -y ntopng nProbe<\/code><\/pre>\n\n<p class=\"wp-block-paragraph\">This installs both ntopng (the web interface and analysis engine) and nProbe (the NetFlow\/IPFIX collector). nProbe allows ntopng to receive flow data from network devices, which is useful if you manage multiple servers or a home lab.<\/p>\n\n<h2 class=\"wp-block-heading\">Step 2: Configure Network Interface<\/h2>\n\n<p class=\"wp-block-paragraph\">Edit the ntopng configuration file:<\/p>\n\n<pre class=\"wp-block-code\"><code>sudo nano \/etc\/ntopng\/ntopng.conf<\/code><\/pre>\n\n<p class=\"wp-block-paragraph\">Set the interface to capture on. Replace eth0 with your actual interface name (check with ip link show):<\/p>\n\n<pre class=\"wp-block-code\"><code>--interface=eth0\n--http-port=0.0.0.0:3000\n--local-networks=192.168.0.0\/16,10.0.0.0\/8\n--disable-autologout=0\n--user=ntopng<\/code><\/pre>\n\n<h2 class=\"wp-block-heading\">Step 3: Start and Enable ntopng<\/h2>\n\n<pre class=\"wp-block-code\"><code>sudo systemctl enable --now ntopng\nsudo systemctl status ntopng<\/code><\/pre>\n\n<p class=\"wp-block-paragraph\">Verify it&#8217;s running by checking the log:<\/p>\n\n<pre class=\"wp-block-code\"><code>sudo journalctl -u ntopng --no-pager -n 20<\/code><\/pre>\n\n<h2 class=\"wp-block-heading\">Step 4: Access the Web Interface and Set Password<\/h2>\n\n<p class=\"wp-block-paragraph\">Open http:\/\/your-vps-ip:3000 in your browser. On first login, set an admin password. The default username is <strong>admin<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\"><em>Security note:<\/em> If your VPS is exposed to the internet, do not leave port 3000 open to everyone. Use a firewall rule to allow only your IP address, or set up an SSH tunnel:<\/p>\n\n<pre class=\"wp-block-code\"><code>ssh -L 3000:localhost:3000 user@your-vps-ip<\/code><\/pre>\n\n<p class=\"wp-block-paragraph\">Then access http:\/\/localhost:3000 on your local machine.<\/p>\n\n<h2 class=\"wp-block-heading\">Step 5: Configure nProbe for NetFlow Collection (Optional)<\/h2>\n\n<p class=\"wp-block-paragraph\">If you want ntopng to collect flow data from multiple sources (e.g., a router, switch, or multiple VPS instances), configure nProbe:<\/p>\n\n<pre class=\"wp-block-code\"><code>sudo nano \/etc\/nprobe\/nprobe.conf<\/code><\/pre>\n\n<p class=\"wp-block-paragraph\">Add the following basic configuration:<\/p>\n\n<pre class=\"wp-block-code\"><code>--collector-port=2055\n--zmq=tcp:\/\/127.0.0.1:5556<\/code><\/pre>\n\n<p class=\"wp-block-paragraph\">Then restart nProbe and update ntopng to listen for ZMQ flows:<\/p>\n\n<pre class=\"wp-block-code\"><code>sudo systemctl enable --now nprobe\n# Add --zmq=tcp:\/\/127.0.0.1:5556 to \/etc\/ntopng\/ntopng.conf\nsudo systemctl restart ntopng<\/code><\/pre>\n\n<h2 class=\"wp-block-heading\">Using ntopng: Key Dashboards<\/h2>\n\n<p class=\"wp-block-paragraph\">Once ntopng is running, these dashboards provide the most useful insights:<\/p>\n\n<h2 class=\"wp-block-heading\">1. Dashboard Overview<\/h2>\n\n<p class=\"wp-block-paragraph\">The main dashboard shows real-time throughput in Mbps, packet rate, and top applications. Look for unexpected spikes \u2014 a sudden jump in outbound traffic could indicate a compromised service sending data externally.<\/p>\n\n<h2 class=\"wp-block-heading\">2. Hosts View<\/h2>\n\n<p class=\"wp-block-paragraph\">Go to Hosts &gt; Local Hosts to see every device or IP that communicates with your VPS. Sort by throughput (Bytes) to identify top talkers. If your VPS is a web server, you should see your users&#8217; IPs at the top. If an unknown IP is sending gigabytes of traffic, investigate immediately.<\/p>\n\n<h2 class=\"wp-block-heading\">3. Flows View<\/h2>\n\n<p class=\"wp-block-paragraph\">Active Flows shows every current TCP\/UDP connection. This is invaluable for debugging: you can see if a misconfigured service is connecting to the wrong host or if a background process is consuming bandwidth.<\/p>\n\n<h2 class=\"wp-block-heading\">4. Historical Reports<\/h2>\n\n<p class=\"wp-block-paragraph\">ntopng stores traffic data in RRD (Round Robin Database) files. Access Reports &gt; Historical to see daily, weekly, or monthly trends. This helps with capacity planning \u2014 if your bandwidth usage grows 20% month-over-month, it&#8217;s time to <a href=\"https:\/\/virtualserversvps.com\/#providers\">compare VPS plans with higher bandwidth allowances<\/a>.<\/p>\n\n<h2 class=\"wp-block-heading\">Detecting Anomalies with ntopng<\/h2>\n\n<p class=\"wp-block-paragraph\">ntopng includes built-in anomaly detection that triggers alerts for:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Port scans:<\/strong> Multiple connection attempts to different ports from a single IP within a short window.<\/li>\n<li><strong>Data exfiltration:<\/strong> Sudden large outbound transfers to an unfamiliar destination IP.<\/li>\n<li><strong>DNS tunneling:<\/strong> Unusually large or frequent DNS queries that could indicate C2 communication.<\/li>\n<li><strong>Protocol anomalies:<\/strong> Traffic on unexpected ports (e.g., SSH traffic on port 8080).<\/li>\n<li><strong>Bandwidth spikes:<\/strong> Throughput exceeding a configurable threshold for a defined period.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Configure alerts under Settings &gt; Alerts. Set thresholds based on your normal traffic patterns \u2014 start by observing for 24\u201348 hours to establish a baseline, then set alerts at 1.5\u20132x the baseline.<\/p>\n\n<h2 class=\"wp-block-heading\">Resource Usage and Performance Impact<\/h2>\n\n<p class=\"wp-block-paragraph\">ntopng itself uses resources. Here&#8217;s what to expect:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>CPU:<\/strong> 5\u201315% of one vCPU on a moderately loaded web server (100 Mbps throughput).<\/li>\n<li><strong>RAM:<\/strong> 300\u2013800 MB depending on the number of tracked flows and historical data retention.<\/li>\n<li><strong>Disk:<\/strong> ~100 MB per day for RRD databases and alerts on a typical server.<\/li>\n<li><strong>Network capture overhead:<\/strong> Near-zero \u2014 ntopng uses the kernel&#8217;s existing packet capture infrastructure (PF_RING or AF_PACKET) with minimal additional processing.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">For production environments, allocate a VPS with at least 4 GB RAM if running ntopng alongside other services. If your main VPS is resource-constrained, consider deploying ntopng on a dedicated monitoring VM that receives NetFlow data from your production instances.<\/p>\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n<p class=\"wp-block-paragraph\">ntopng transforms your VPS from a black box into a transparent, observable system. With real-time traffic visualization, historical reporting, and anomaly detection, you can troubleshoot performance issues, plan capacity upgrades, and spot security incidents before they escalate. Install it today and gain full visibility into your VPS network traffic. <a href=\"https:\/\/virtualserversvps.com\/#providers\">Find a VPS with enough resources for monitoring<\/a> on our comparison table.<\/p>","protected":false},"excerpt":{"rendered":"<p>If you run a VPS, you know bandwidth matters \u2014 but do you know exactly where it&#8217;s going? ntopng is an open-source network traffic analyzer that gives you real-time visibility&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":0,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-679","post","type-post","status-publish","format-standard","hentry","category-performance-optimization"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v26.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>VPS Traffic Analysis with ntopng: Monitor Bandwidth Usage and Detect Anomalies - Virtual Servers VPS Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"VPS Traffic Analysis with ntopng: Monitor Bandwidth Usage and Detect Anomalies\" \/>\n<meta property=\"og:description\" content=\"VPS Traffic Analysis with ntopng: Monitor Bandwidth Usage and Detect Anomalies\" \/>\n<meta property=\"og:url\" content=\"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/\" \/>\n<meta property=\"og:site_name\" content=\"Virtual Servers VPS Blog\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-20T02:00:26+00:00\" \/>\n<meta name=\"author\" content=\"Virtual-Servers-Vps-Editor\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Virtual-Servers-Vps-Editor\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/\",\"url\":\"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/\",\"name\":\"VPS Traffic Analysis with ntopng: Monitor Bandwidth Usage and Detect Anomalies - Virtual Servers VPS Blog\",\"isPartOf\":{\"@id\":\"https:\/\/virtualserversvps.com\/blog\/#website\"},\"datePublished\":\"2026-07-20T02:00:26+00:00\",\"author\":{\"@id\":\"https:\/\/virtualserversvps.com\/blog\/#\/schema\/person\/82a299a8284a66ff49f97c74684724a0\"},\"breadcrumb\":{\"@id\":\"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/virtualserversvps.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"VPS Traffic Analysis with ntopng: Monitor Bandwidth Usage and Detect Anomalies\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/virtualserversvps.com\/blog\/#website\",\"url\":\"https:\/\/virtualserversvps.com\/blog\/\",\"name\":\"Virtual Servers VPS Blog\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/virtualserversvps.com\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/virtualserversvps.com\/blog\/#\/schema\/person\/82a299a8284a66ff49f97c74684724a0\",\"name\":\"Virtual-Servers-Vps-Editor\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/virtualserversvps.com\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/d820b15f1cd028e97610d9adf536df7be5cb6423869967037d468d5355fa003f?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/d820b15f1cd028e97610d9adf536df7be5cb6423869967037d468d5355fa003f?s=96&d=mm&r=g\",\"caption\":\"Virtual-Servers-Vps-Editor\"},\"sameAs\":[\"https:\/\/virtualserversvps.com\/blog\"],\"url\":\"https:\/\/virtualserversvps.com\/blog\/author\/virtualserversvps\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"VPS Traffic Analysis with ntopng: Monitor Bandwidth Usage and Detect Anomalies - Virtual Servers VPS Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/","og_locale":"en_US","og_type":"article","og_title":"VPS Traffic Analysis with ntopng: Monitor Bandwidth Usage and Detect Anomalies","og_description":"VPS Traffic Analysis with ntopng: Monitor Bandwidth Usage and Detect Anomalies","og_url":"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/","og_site_name":"Virtual Servers VPS Blog","article_published_time":"2026-07-20T02:00:26+00:00","author":"Virtual-Servers-Vps-Editor","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Virtual-Servers-Vps-Editor","Est. reading time":"5 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/","url":"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/","name":"VPS Traffic Analysis with ntopng: Monitor Bandwidth Usage and Detect Anomalies - Virtual Servers VPS Blog","isPartOf":{"@id":"https:\/\/virtualserversvps.com\/blog\/#website"},"datePublished":"2026-07-20T02:00:26+00:00","author":{"@id":"https:\/\/virtualserversvps.com\/blog\/#\/schema\/person\/82a299a8284a66ff49f97c74684724a0"},"breadcrumb":{"@id":"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/virtualserversvps.com\/blog\/vps-traffic-analysis-netflow-ntopng-guide-2026\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/virtualserversvps.com\/blog\/"},{"@type":"ListItem","position":2,"name":"VPS Traffic Analysis with ntopng: Monitor Bandwidth Usage and Detect Anomalies"}]},{"@type":"WebSite","@id":"https:\/\/virtualserversvps.com\/blog\/#website","url":"https:\/\/virtualserversvps.com\/blog\/","name":"Virtual Servers VPS Blog","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/virtualserversvps.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/virtualserversvps.com\/blog\/#\/schema\/person\/82a299a8284a66ff49f97c74684724a0","name":"Virtual-Servers-Vps-Editor","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/virtualserversvps.com\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/d820b15f1cd028e97610d9adf536df7be5cb6423869967037d468d5355fa003f?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/d820b15f1cd028e97610d9adf536df7be5cb6423869967037d468d5355fa003f?s=96&d=mm&r=g","caption":"Virtual-Servers-Vps-Editor"},"sameAs":["https:\/\/virtualserversvps.com\/blog"],"url":"https:\/\/virtualserversvps.com\/blog\/author\/virtualserversvps\/"}]}},"_links":{"self":[{"href":"https:\/\/virtualserversvps.com\/blog\/wp-json\/wp\/v2\/posts\/679","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/virtualserversvps.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/virtualserversvps.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/virtualserversvps.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/virtualserversvps.com\/blog\/wp-json\/wp\/v2\/comments?post=679"}],"version-history":[{"count":1,"href":"https:\/\/virtualserversvps.com\/blog\/wp-json\/wp\/v2\/posts\/679\/revisions"}],"predecessor-version":[{"id":680,"href":"https:\/\/virtualserversvps.com\/blog\/wp-json\/wp\/v2\/posts\/679\/revisions\/680"}],"wp:attachment":[{"href":"https:\/\/virtualserversvps.com\/blog\/wp-json\/wp\/v2\/media?parent=679"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/virtualserversvps.com\/blog\/wp-json\/wp\/v2\/categories?post=679"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/virtualserversvps.com\/blog\/wp-json\/wp\/v2\/tags?post=679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}