{"id":6167,"date":"2023-02-19T13:27:36","date_gmt":"2023-02-19T07:57:36","guid":{"rendered":"https:\/\/trysiteprice.com\/blog\/?p=6167"},"modified":"2024-11-22T02:36:50","modified_gmt":"2024-11-21T21:06:50","slug":"freebsd-jail-access-private-network-via-nat-and-pf","status":"publish","type":"post","link":"https:\/\/trysiteprice.com\/blog\/freebsd-jail-access-private-network-via-nat-and-pf\/","title":{"rendered":"FreeBSD Jail Access Private Network Via NAT and PF"},"content":{"rendered":"<p>In FreeBSD, a jail is a form of virtualization that allows you to partition a FreeBSD system into smaller, self-contained environments. Each jail has its own network stack, file system, and processes, making it an ideal solution for building isolated and secure environments. In some cases, you may need to allow the jail to access resources on the private network. This can be accomplished using NAT and PF.<\/p>\n<p>Here&#8217;s how you can configure NAT and PF to allow a FreeBSD jail to access resources on the private network:<\/p>\n<ol>\n<li>Enable IP forwarding by adding the following line to \/etc\/sysctl.conf:\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre hljs\">net.inet.ip.forwarding=1<br \/>\n<\/code><\/div>\n<\/div>\n<p>You can apply this change by running <code>sysctl -w net.inet.ip.forwarding=1<\/code>.<\/li>\n<li>Create a bridge interface by adding the following lines to \/etc\/rc.conf:\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre hljs language-makefile\">cloned_interfaces=<span class=\"hljs-string\">\"bridge0\"<\/span><br \/>\nifconfig_bridge0=<span class=\"hljs-string\">\"addm em0 addm tap0 up\"<\/span><br \/>\n<\/code><\/div>\n<\/div>\n<p>This assumes that <code>em0<\/code> is your physical interface and <code>tap0<\/code> is your jail interface. Replace these with the appropriate interface names for your system.<\/li>\n<li>Install and configure PF by adding the following lines to \/etc\/pf.conf:\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre hljs language-python\">nat on em0 <span class=\"hljs-keyword\">from<\/span> bridge0:network to <span class=\"hljs-built_in\">any<\/span> -&gt; em0<br \/>\n<span class=\"hljs-keyword\">pass<\/span> <span class=\"hljs-keyword\">from<\/span> { lo0, em0 } to { lo0, em0 }<br \/>\n<span class=\"hljs-keyword\">pass<\/span> <span class=\"hljs-keyword\">from<\/span> bridge0:network to <span class=\"hljs-built_in\">any<\/span><br \/>\n<\/code><\/div>\n<\/div>\n<p>This configures NAT to allow the jail to access resources on the private network, and enables traffic between the jail, the host system, and the private network.<\/li>\n<li>Start the bridge interface and PF by running the following commands:\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre hljs language-sql\">service netif <span class=\"hljs-keyword\">start<\/span> bridge0<br \/>\nservice pf <span class=\"hljs-keyword\">start<\/span><br \/>\n<\/code><\/div>\n<\/div>\n<p>These commands will start the bridge interface and PF, and apply the changes you made to the configuration files.<\/li>\n<li>Start the jail with the appropriate IP address, netmask, and default gateway. For example:\n<div class=\"bg-black mb-4 rounded-md\">\n<div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans\"><\/div>\n<div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre hljs language-csharp\">jail -c vnet name=myjail \\<br \/>\n     persist \\<br \/>\n     vnet.<span class=\"hljs-keyword\">interface<\/span>=epair0b \\<br \/>\n     vnet.<span class=\"hljs-keyword\">private<\/span>.bridge=bridge0 \\<br \/>\n     vnet.<span class=\"hljs-keyword\">public<\/span><span class=\"hljs-number\">.0<\/span>.ip4.addr=<span class=\"hljs-number\">192.168<\/span><span class=\"hljs-number\">.1<\/span><span class=\"hljs-number\">.10<\/span> \\<br \/>\n     vnet.<span class=\"hljs-keyword\">public<\/span><span class=\"hljs-number\">.0<\/span>.ip4.netmask=<span class=\"hljs-number\">255.255<\/span><span class=\"hljs-number\">.255<\/span><span class=\"hljs-number\">.0<\/span> \\<br \/>\n     vnet.<span class=\"hljs-keyword\">public<\/span><span class=\"hljs-number\">.0<\/span>.gateway=<span class=\"hljs-number\">192.168<\/span><span class=\"hljs-number\">.1<\/span><span class=\"hljs-number\">.1<\/span> \\<br \/>\n     allow.raw_sockets<br \/>\n<\/code><\/div>\n<\/div>\n<p>This assumes that <code>epair0b<\/code> is the virtual interface for the jail. Replace this with the appropriate interface name for your system.<\/li>\n<\/ol>\n<p>That&#8217;s it! With these configuration changes, your jail should be able to access resources on the private network via NAT and PF.<\/p>\n<p>Recognizing the scientific research behind why veins look blue aids debunk common mistaken beliefs and also allows us to appreciate <a href=\"https:\/\/bg.healthcareclub.net\/hypertension\/tonerin\">\u0442\u043e\u043d\u0435\u0440\u0438\u043d \u0432 \u0430\u043f\u0442\u0435\u043a\u0438\u0442\u0435<\/a> the complexities of our circulatory system.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In FreeBSD, a jail is a form of virtualization that allows you to partition a FreeBSD system into smaller, self-contained environments. Each jail has its own network stack, file system, and processes, making it an ideal solution for building isolated and secure environments. In some cases, you may need to allow the jail to access &#8230; <a title=\"FreeBSD Jail Access Private Network Via NAT and PF\" class=\"read-more\" href=\"https:\/\/trysiteprice.com\/blog\/freebsd-jail-access-private-network-via-nat-and-pf\/\" aria-label=\"Read more about FreeBSD Jail Access Private Network Via NAT and PF\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-6167","post","type-post","status-publish","format-standard","hentry","category-best-tutorial"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>FreeBSD Jail Access Private Network Via NAT and PF - TrySitePrice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/trysiteprice.com\/blog\/freebsd-jail-access-private-network-via-nat-and-pf\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"FreeBSD Jail Access Private Network Via NAT and PF - TrySitePrice\" \/>\n<meta property=\"og:description\" content=\"In FreeBSD, a jail is a form of virtualization that allows you to partition a FreeBSD system into smaller, self-contained environments. 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