{"id":707,"date":"2012-09-01T00:00:00","date_gmt":"2012-09-01T00:00:00","guid":{"rendered":"https:\/\/fir3netwp.gmsrrpobkbd.com\/2012\/09\/01\/cisco-asa-twice-nat\/"},"modified":"2021-07-30T13:22:15","modified_gmt":"2021-07-30T13:22:15","slug":"cisco-asa-twice-nat","status":"publish","type":"post","link":"https:\/\/www.fir3net.com\/Cisco-ASA\/cisco-asa-twice-nat.html","title":{"rendered":"Cisco ASA &#8211; Twice NAT"},"content":{"rendered":"<p>Twice NAT allows you to NAT both the source and destination within a single rule.<\/p>\n<h2><strong>Scenario<\/strong><\/h2>\n<p>A scenario where this type of configuration would be required is shown below. To ensure that any traffic originating from the Internet isn&#8217;t sent back out to its default gateway (asymmetrically routed) the source IP is translated to an IP within the range of the inside segment (192.168.100.0\/24). In turn ensuring the return traffic is sent back via the the Cisco ASA.<\/p>\n<p>&nbsp;<\/p>\n<h2><strong>Example<\/strong><\/h2>\n<p>Within this example we will perform both Static PAT along with Dynamic PAT to ensure that traffic to our SMTP (192.168.100.200) server is not asymmetrically routed.<\/p>\n<p>Here are some more details :<\/p>\n<ul>\n<li>Static PAT &#8211; A static NAT is configured for the real server 192.168.100.200 to a translated address of 33.33.33.33 on port TCP\/25 (SMTP).<\/li>\n<li>Dynamic PAT &#8211; A dynamic PAT is configured which translates all traffic coming in from the outside interface to the source IP address of 192.168.100.100.<\/li>\n<\/ul>\n<h2><strong>Syntax<\/strong><\/h2>\n<p>Below shows the required syntax.<\/p>\n<p class=\"codemulti\">object network SERVER-33.33.33.33<br \/>\nhost 33.33.33.33<br \/>\nobject network SERVER-192.168.100.200<br \/>\nhost 192.168.100.200<br \/>\nobject service SMTP-SERVICE<br \/>\nservice tcp destination eq 25<br \/>\nobject network PAT-ADDRESS-100<br \/>\nhost 192.168.100.100<\/p>\n<p>nat (outside,inside) 1 source dynamic any PAT-ADDRESS-100 destination static SERVER-33.33.33.33 SERVER-192.168.100.200 service SMTP-SERVICE SMTP-SERVICE<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Twice NAT allows you to NAT both the source and destination within a single rule. Scenario A scenario where this type of configuration would be required is shown below. To ensure that any traffic originating from the Internet isn&#8217;t sent back out to its default gateway (asymmetrically routed) the source IP is translated to an &#8230; <a title=\"Cisco ASA &#8211; Twice NAT\" class=\"read-more\" href=\"https:\/\/www.fir3net.com\/Cisco-ASA\/cisco-asa-twice-nat.html\" aria-label=\"Read more about Cisco ASA &#8211; Twice NAT\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":706,"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 - Twice NAT - Fir3net<\/title>\n<meta name=\"description\" content=\"Twice NAT allows you to NAT both the source and destination within a single rule. 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