{"id":639,"date":"2021-07-23T12:34:35","date_gmt":"2021-07-23T12:34:35","guid":{"rendered":"https:\/\/ssdsunucum.com\/blog\/11-nat\/"},"modified":"2021-07-23T12:34:35","modified_gmt":"2021-07-23T12:34:35","slug":"11-nat","status":"publish","type":"post","link":"https:\/\/ssdsunucum.com\/blog\/11-nat\/","title":{"rendered":"1:1 NAT"},"content":{"rendered":"<\/p>\n
\n
<\/div>\n
\n

Overview<\/h2>\n
\n
Warning:<\/div>\n
\n We strongly<\/strong> recommend that you only<\/strong> perform these actions on a new installation of cPanel & WHM. Do not<\/strong> attempt a 1:1 NAT configuration on an existing production server.\n <\/div>\n<\/div>\n

When you install cPanel & WHM, the installer will detect whether your server resides on a NAT-configured network. If the installer detects a NAT-configured network, your server will configure itself for NAT mode and attempt to automatically map local IP addresses to public IP addresses.<\/p>\n

\n
Note:<\/div>\n
\n
    \n
  • If you use a NAT environment, your server must<\/strong> reside in a 1:1 NAT configuration to install cPanel & WHM.<\/li>\n
  • For a list of ports that you must open to allow cPanel & WHM services to function on your server, read our How to Configure Your Firewall for cPanel & WHM Services documentation.<\/li>\n<\/ul><\/div>\n<\/div>\n

    The mapping process<\/h2>\n

    The system attempts to map all non-loopback IP addresses bound to any network interface on the server to a public IP address.<\/p>\n

    \n
    \n<\/figure>\n

    To complete this process, the system performs the following actions:<\/p>\n

      \n
    1. Your server will send an outgoing connection from each local IP address to the http:\/\/myip.cpanel.net\/v1.0\/<\/code> server.<\/li>\n
    2. The http:\/\/myip.cpanel.net\/v1.0\/<\/code> server responds with the public IP address from which it received the request.<\/li>\n
    3. The system maps the local IP address to this public IP address.<\/li>\n<\/ol>\n
      \n
      Warning:<\/div>\n
      \n We do not<\/strong> recommend that you map more than one local IP map address to a single public IP address.\n <\/div>\n<\/div>\n

      Manage IP addresses<\/h2>\n

      You can manage the maps for local and remote IP addresses with the following WHM interfaces:<\/p>\n

        \n
      • The
        \nAdd a New IP Address<\/em>
        \ninterface (WHM >> Home >> IP Functions >> Add a New IP Address<\/em>).<\/li>\n
      • The Show or Delete Current IP Addresses<\/em> interface (WHM >> Home >> IP Functions >> Show or Delete Current IP Addresses<\/em>).<\/li>\n
      • The IP Migration Wizard<\/em> interface (WHM >> Home >> IP Functions >> IP Migration Wizard<\/em>).<\/li>\n<\/ul>\n

        Each interface displays the warning notice NAT mode enabled<\/em> if NAT is enabled on your server.<\/p>\n

        \n
        Warning:<\/div>\n
        \n If multiple local IP addresses match the same public IP address, the system will only<\/strong> map the first local IP address in the \/var\/cpanel\/cpnat<\/code> file.\n <\/div>\n<\/div>\n

        The build_cpnat script<\/h2>\n

        The \/usr\/local\/cpanel\/scripts\/build_cpnat<\/code> script uses the http:\/\/myip.cpanel.net\/v1.0\/<\/code> server to map local IP addresses to public IP addresses. However, if you wish to use a different IP address lookup service, perform the following steps:<\/p>\n

          \n
        1. \n

          Open the \/etc\/cpsources.conf<\/code> file with a text editor and add the following line:<\/p>\n

          MYIP=https:\/\/ifconfig.me\/ip\n<\/code><\/pre>\n<\/li>\n
        2. \n
          Run the \/usr\/local\/cpanel\/scripts\/build_cpnat<\/code> script.<\/p>\n
          \n
          Note:<\/div>\n
          \n
            \n
          • \n
            For more information about the build_cpnat<\/code> script, run the following command:<\/p>\n
            \/usr\/local\/cpanel\/scripts\/build_cpnat --man\n<\/code><\/pre>\n<\/li>\n
          • \n
            If you accidentally delete your cpnat<\/code> file or the file becomes becomes corrupted, rebuild it with the \/usr\/local\/cpanel\/scripts\/build_cpnat<\/code> script.<\/p>\n<\/li>\n
          • \n
            The \/var\/cpanel\/cpnat<\/code> file acts as a flag file for NAT mode. If the installer mistakenly detects a NAT-configured network, delete the\/var\/cpanel\/cpnat<\/code> file to disable NAT mode.<\/p>\n<\/li>\n<\/ul><\/div>\n<\/div>\n<\/li>\n
          • \n
            Update your cPanel accounts\u2019 local IP addresses in WHM\u2019s IP Migration Wizard<\/em> interface (WHM >> Home >> IP Functions >> IP Migration Wizard<\/em>).<\/p>\n<\/li>\n<\/ol><\/div>\n","protected":false},"excerpt":{"rendered":"
            Overview Warning: We strongly recommend that you only perform these actions on a new installation of cPanel & WHM. Do not attempt a 1:1 NAT configuration on an existing production server. When you install cPanel & WHM, the installer will detect whether your server resides on a NAT-configured network. If the installer detects a NAT-configured …<\/p>\n","protected":false},"author":1,"featured_media":640,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/ssdsunucum.com\/blog\/wp-json\/wp\/v2\/posts\/639"}],"collection":[{"href":"https:\/\/ssdsunucum.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ssdsunucum.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ssdsunucum.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ssdsunucum.com\/blog\/wp-json\/wp\/v2\/comments?post=639"}],"version-history":[{"count":0,"href":"https:\/\/ssdsunucum.com\/blog\/wp-json\/wp\/v2\/posts\/639\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ssdsunucum.com\/blog\/wp-json\/wp\/v2\/media\/640"}],"wp:attachment":[{"href":"https:\/\/ssdsunucum.com\/blog\/wp-json\/wp\/v2\/media?parent=639"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ssdsunucum.com\/blog\/wp-json\/wp\/v2\/categories?post=639"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ssdsunucum.com\/blog\/wp-json\/wp\/v2\/tags?post=639"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}