{"id":670,"date":"2012-04-25T07:18:09","date_gmt":"2012-04-25T07:18:09","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2012\/04\/25\/cisco-asa-security-levels-nat-control\/"},"modified":"2021-07-24T18:16:57","modified_gmt":"2021-07-24T18:16:57","slug":"cisco-asa-security-levels-nat-control","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-asa-security-levels-nat-control.html","title":{"rendered":"Cisco ASA &#8211; Security Levels \/ NAT Control"},"content":{"rendered":"<p>Within the Cisco Firewall family (PIX\/ASA) there are 2 security features known as Security Levels and NAT Control.<\/p>\n<h4><strong>Security Levels<\/strong><\/h4>\n<p>Security levels are numeric values (between 0 and 100) which are assigned to the firewalls interfaces and used to control traffic flows. Traffic is allowed to pass from a higher security level to a lower security level but not vice-versa. To allow traffic from a lower security level to a higher security level an access-list is required. By default the security level for the outside interface is 0 and the inside interface 100.<br \/>Below provides an example on how to explicitly configure an interface security level.<\/p>\n<p class=\"codemulti\">asa(config)# interface eth2<br \/>asa(config-if)# nameif dmz<br \/>asa(config-if)# security-level 50<\/p>\n<h4><strong>NAT Control<\/strong><\/h4>\n<p>NAT Control mandates that any traffic transversing from a higher security level to a lower security level must match a NAT rule.<br \/>Belows provides an example on how to disable NAT Control<\/p>\n<p class=\"codemulti\">asa(config)# no nat-control<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Within the Cisco Firewall family (PIX\/ASA) there are 2 security features known as Security Levels and NAT Control. Security Levels Security levels are numeric values (between 0 and 100) which are assigned to the firewalls interfaces and used to control traffic flows. Traffic is allowed to pass from a higher security level to a lower &#8230; <a title=\"Cisco ASA &#8211; Security Levels \/ NAT Control\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-asa-security-levels-nat-control.html\" aria-label=\"Read more about Cisco ASA &#8211; Security Levels \/ NAT Control\">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":[11],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cisco ASA - Security Levels \/ NAT Control - Fir3net<\/title>\n<meta name=\"description\" content=\"Within the Cisco Firewall family (PIX\/ASA) there are 2 security features known as Security Levels and NAT Control. Security Levels Security levels are\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fir3net.com\/Firewalls\/Cisco\/cisco-asa-security-levels-nat-control.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cisco ASA - Security Levels \/ NAT Control - Fir3net\" \/>\n<meta property=\"og:description\" content=\"Within the Cisco Firewall family (PIX\/ASA) there are 2 security features known as Security Levels and NAT Control. 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