{"id":285,"date":"2009-08-27T10:30:59","date_gmt":"2009-08-27T10:30:59","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2009\/08\/27\/netscreen-attack-detection-and-defense-overview\/"},"modified":"2021-07-24T19:00:13","modified_gmt":"2021-07-24T19:00:13","slug":"netscreen-attack-detection-and-defense-overview","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/netscreen-attack-detection-and-defense-overview.html","title":{"rendered":"Netscreen Attack Detection and Defense Overview"},"content":{"rendered":"<p><span>Below outlines Netcreens Attack Detection and Defense. This is by no means a full guide by acts as a general summary to the various terms and technologies.<br \/><\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-662dda8f68a93\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-662dda8f68a93\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/netscreen-attack-detection-and-defense-overview.html\/#SCREEN\" title=\"SCREEN\">SCREEN<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/netscreen-attack-detection-and-defense-overview.html\/#Deep_Inspection\" title=\"Deep Inspection \">Deep Inspection <\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/netscreen-attack-detection-and-defense-overview.html\/#URL_Filtering\" title=\"URL Filtering \">URL Filtering <\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/netscreen-attack-detection-and-defense-overview.html\/#AV\" title=\"AV \">AV <\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/netscreen-attack-detection-and-defense-overview.html\/#ALG\" title=\"ALG \">ALG <\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"SCREEN\"><\/span><span><strong>SCREEN<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span>Features legacy security protection, such as SYN, UDP and ICMP floods, Port scans and certain OS-specific DoS attacks.<br \/><\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Deep_Inspection\"><\/span><span><strong>Deep Inspection<\/strong><\/span><br \/><span><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span>Allows for inspection at the application layer for select protocols using stateful contexts. ScreenOS breaks down the protocol stream into inspectable fields. ScreenOS then uses DFA (Deterministic Finite Automation) to inspect these fields.<\/span><br \/><span>Deep Inspection allows for you to configure your Netscreen to automatically update your Deep Inspection signature set, along with write your own using FDA Regex.<\/span><br \/>A license is required to activate Deep Inspection and to add Deep Inspection to a policy just click the Deep Inspection icon within the policy to set the required settings. To create you own signiture go to &#8220;Objects | Attack | Custom&#8221;.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"URL_Filtering\"><\/span><span><strong>URL Filtering<\/strong><br \/><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span>This allows for the use of 3rd Parties URL filtering options such as either SurfControl or Websense. Surf control includes an option called integrated mode which allows you to store filtering profiles upon the firewall itself.<br \/><\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"AV\"><\/span><span><strong>AV<\/strong><br \/><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span>This allows for HTTP, FTP, SMTP, POP3 and IMAP protocols to be inspected for viruses with the activation of a license. To enable and configure AV go to &#8220;Screening | Antivirus | Global&#8221;.<\/p>\n<p><\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"ALG\"><\/span><span><strong>ALG<\/strong><br \/><\/span><span><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span>Protocols such as FTP, H.323 and other dynamic channel protocols can cause problems when creating the necessary firewall policies, due to the way thy dynamically choose\/assign ports. To overcome this a subset of ALG`s were created for these protocols, which allow them to inspect the traffic\/packets at the application layer and in turn allows the traffic through based on how the protocols function.<\/span><span><br \/><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Below outlines Netcreens Attack Detection and Defense. This is by no means a full guide by acts as a general summary to the various terms and technologies. SCREEN Features legacy security protection, such as SYN, UDP and ICMP floods, Port scans and certain OS-specific DoS attacks. Deep Inspection Allows for inspection at the application layer &#8230; <a title=\"Netscreen Attack Detection and Defense Overview\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Juniper\/netscreen-attack-detection-and-defense-overview.html\" aria-label=\"Read more about Netscreen Attack Detection and Defense Overview\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Netscreen Attack Detection and Defense Overview - Fir3net<\/title>\n<meta name=\"description\" content=\"Below outlines Netcreens Attack Detection and Defense. 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