{"id":24295,"date":"2025-09-15T07:00:15","date_gmt":"2025-09-15T12:00:15","guid":{"rendered":"https:\/\/www.firewalls.com\/blog\/?p=24295"},"modified":"2025-11-12T08:59:55","modified_gmt":"2025-11-12T13:59:55","slug":"deep-packet-inspection-software","status":"publish","type":"post","link":"https:\/\/www.firewalls.com\/blog\/deep-packet-inspection-software\/","title":{"rendered":"Deep Packet Inspection Software vs Stateful Packet Inspection: How Do They Differ?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"24295\" class=\"elementor elementor-24295\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c295d8d e-flex e-con-boxed e-con e-parent\" data-id=\"c295d8d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bd7b1fa elementor-widget elementor-widget-text-editor\" data-id=\"bd7b1fa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Traditional packet filtering may have been sufficient back in the 80s and 90s, but not in today\u2019s world. When it comes to the types of cyber threats businesses face now, deep packet inspection software (DPI) and stateful packet inspection (SPI) are hot topics.<\/span><\/p><p><span style=\"font-weight: 400;\">As you might expect, they come with some unique differences. Understanding the roles they play is a crucial part of choosing <\/span><a href=\"https:\/\/www.firewalls.com\/blog\/next-generation-firewall-features\/\"><span style=\"font-weight: 400;\">the right firewalls<\/span><\/a><span style=\"font-weight: 400;\">, analyzing business demands, and navigating your network security architecture.<\/span><\/p><p><span style=\"font-weight: 400;\">If you want to avoid feeling overwhelmed by network visibility and analysis, you\u2019ll want to consider the importance of DPI and SPI. This article compares the two for a straightforward answer on how they differ and why both are important in today\u2019s network security landscape.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f27d2da elementor-widget elementor-widget-heading\" data-id=\"f27d2da\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">The Important Role of Packet Inspection\n<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-814bc79 elementor-widget elementor-widget-text-editor\" data-id=\"814bc79\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">You need network visibility that goes beyond simple port and IP filtering. Where packet inspection comes in is the focus on enabling detection of much more sophisticated threats. This is simply the current state of potential network security threats, hence why DPI and SPI are so common nowadays.\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">They\u2019re also an important component of granular security policies and support much more control over network traffic as a whole. It\u2019s only becoming more important as time goes on, as it plays a role in many network security demands like troubleshooting, compliance enforcement, and visibility in more <\/span><a href=\"https:\/\/www.firewalls.com\/blog\/evolving-firewall-solutions\/\"><span style=\"font-weight: 400;\">dynamic network setups<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ebd3fdf elementor-widget elementor-widget-heading\" data-id=\"ebd3fdf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What is Deep Packet Inspection?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4600f59 elementor-widget elementor-widget-text-editor\" data-id=\"4600f59\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Considering how technical security appliances can be, it can be easy to let certain specs and features slip through the cracks. DPI works on full packet contents and operates at the application layer for much deeper visibility. Surface-level inspection doesn\u2019t cut it anymore, making DPI a necessity in your network security.<\/span><\/p><p><span style=\"font-weight: 400;\">Here are a few other details about DPI that you should know:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Packet inspection goes through multiple stages like header review, payload decoding, threat signature comparison, and more.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Techniques specific to DPI include behavior analysis, pattern matching, protocol validation, and statistical anomaly detection.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Identifies malicious content that can be hidden amongst normal-looking network traffic.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">While this might seem like more than enough alongside your <\/span><a href=\"https:\/\/www.firewalls.com\/blog\/hardware-vs-software-firewalls\/\"><span style=\"font-weight: 400;\">hardware and software<\/span><\/a><span style=\"font-weight: 400;\"> solutions, you can\u2019t forget about SPI\u2019s role here. <\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b0868d2 elementor-widget elementor-widget-heading\" data-id=\"b0868d2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What is Stateful Packet Inspection?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ccb9140 elementor-widget elementor-widget-text-editor\" data-id=\"ccb9140\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">The main difference with SPI is that it focuses on the context of network traffic. What this means is that it makes sure that each packet is a part of a valid, existing session. Much better than what stateless filtering can provide, and it does well to protect your network against connection-related attacks.<\/span><\/p><p><span style=\"font-weight: 400;\">Below are several key characteristics unique to stateful packet inspection:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Defends against certain attacks like session hijacking and TCP spoofing<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Classifies traffic into different states to detect potentially malicious activity<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Uses a \u2018state table\u2019 to log important details about network traffic like port numbers, IP addresses, session timing, and more<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Although it\u2019s true that SPI is a bit less thorough than the likes of DPI, it\u2019s known to be more efficient with actions like managing connection-level security. Without this breakdown between the two, it can be challenging for new and growing businesses to understand their importance.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e83d28e elementor-widget elementor-widget-heading\" data-id=\"e83d28e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Transparency in DPI vs SPI\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7b9fccf elementor-widget elementor-widget-text-editor\" data-id=\"7b9fccf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Between features, capability, and overall integration into your network security, the topic of DPI vs SPI can be rather confusing. That isn\u2019t to say the details don\u2019t matter, but there\u2019s definitely an easier way to digest the information. Check out the table below for a straightforward comparison between DPI and SPI.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a3b8ea6 elementor-widget elementor-widget-shortcode\" data-id=\"a3b8ea6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">\n<table id=\"tablepress-85\" class=\"tablepress tablepress-id-85\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Specification<\/th><th class=\"column-2\">Barracuda F80<\/th><th class=\"column-3\">Barracuda F180<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Firewall Throughput (Gbps)<\/td><td class=\"column-2\">2<\/td><td class=\"column-3\">1.7<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">VPN Throughput (Mbps)<\/td><td class=\"column-2\">720<\/td><td class=\"column-3\">300<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">IPS Throughput (Mbps)<\/td><td class=\"column-2\">600<\/td><td class=\"column-3\">500<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">NGFW Throughput (Mbps)<\/td><td class=\"column-2\">400<\/td><td class=\"column-3\">550<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">Threat Protection Throughput (Mbps)<\/td><td class=\"column-2\">380<\/td><td class=\"column-3\">480<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">Concurrent Sessions<\/td><td class=\"column-2\">80,000<\/td><td class=\"column-3\">100,000<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">New Sessions per Second<\/td><td class=\"column-2\">12,000<\/td><td class=\"column-3\">9,000<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">Copper Ethernet NICs (GbE)<\/td><td class=\"column-2\">5x1<\/td><td class=\"column-3\">6x1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-85 from cache --><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6d11979 e-flex e-con-boxed e-con e-parent\" data-id=\"6d11979\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4eaf9d9 elementor-widget elementor-widget-text-editor\" data-id=\"4eaf9d9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">It isn\u2019t really about which one you should go for, but why both DPI and SPI are important in today\u2019s cybersecurity landscape. Thankfully, a lot of this is covered in network security hardware, licensing, and even managed services.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f44f62f elementor-widget elementor-widget-heading\" data-id=\"f44f62f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Let\u2019s Wrap Up\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-aff9214 elementor-widget elementor-widget-text-editor\" data-id=\"aff9214\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">There\u2019s a lot of technical jargon involved with firewalls and network security, but overlooking this can leave your business wide open to an attack. When you consider the scale of cybersecurity threats that are out there, it\u2019s best to stay ahead of the curve.<\/span><\/p><p><span style=\"font-weight: 400;\">For many young and growing companies, this is easier said than done as they go through the necessary learning curve. It never hurts to get a little help along the way, which is where our team members can chime in to assist. We\u2019re always available <\/span><a href=\"https:\/\/www.firewalls.com\/contact\"><span style=\"font-weight: 400;\">for a chat<\/span><\/a><span style=\"font-weight: 400;\"> if you\u2019d like to learn more about DPI vs SPI and the hardware that can support your network security demands.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-55f4eda elementor-widget elementor-widget-button\" data-id=\"55f4eda\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"tel:3172254117\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Call Now<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Comparing deep packet inspection software vs stateful packet inspection firewalls, and what makes both a necessity.<\/p>\n","protected":false},"author":13,"featured_media":26624,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[286,597],"tags":[],"class_list":["post-24295","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cybersecurity","category-firewalls"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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