{"id":523,"date":"2026-08-16T07:43:59","date_gmt":"2026-08-16T02:13:59","guid":{"rendered":"https:\/\/networkfix.in\/uncategorized\/palo-alto-destination-nat-configuration\/"},"modified":"2026-09-19T15:38:52","modified_gmt":"2026-09-19T10:08:52","slug":"palo-alto-destination-nat-configuration","status":"publish","type":"post","link":"https:\/\/networkfix.in\/en\/tutorials\/palo\/palo-alto-destination-nat-configuration\/","title":{"rendered":"Palo Alto Destination NAT and Port Forwarding with a Real-Life Web Server Example"},"content":{"rendered":"<p>Configuring destination NAT on a firewall can be confusing if you transition from other security platforms. Palo Alto Networks processes NAT and security policies using a distinct logic. A successful <strong>Palo Alto Destination NAT configuration<\/strong> requires you to understand how the architecture handles zone lookups and address evaluation during packet processing.<\/p>\n<p>In this tutorial, you will learn how to publish an internal HTTPS web server to the internet using Destination NAT (DNAT) and Port Forwarding. We will cover the core architectural rules, step-by-step GUI and CLI steps, packet flow mechanics, verification commands, and real-world troubleshooting techniques.<\/p>\n<h2>Real-Life Scenario<\/h2>\n<p>Your enterprise operates an internal portal located in the DMZ network. The server hosts an application over secure HTTP (HTTPS) at the private IP address <code>192.168.20.10<\/code> listening on standard TCP port 443.<\/p>\n<p>The business requirement dictates that remote clients and external partners must access this web server from the public internet. Your Internet Service Provider (ISP) assigned a public IP subnet to your WAN interface. You allocated the public documentation address <code>203.0.113.10<\/code> to represent this server on the internet.<\/p>\n<p>To fulfill this requirement, you must create configuration policies on the firewall to perform two tasks:<\/p>\n<ul>\n<li>Translate incoming traffic addressed to <code>203.0.113.10<\/code> to the internal address <code>192.168.20.10<\/code>.<\/li>\n<li>Allow the inbound HTTPS traffic through the security policy while maintaining strict access controls.<\/li>\n<\/ul>\n<h2>Lab Topology<\/h2>\n<p>The diagram below illustrates the physical and logical network path for inbound client connections. All network addresses, hostnames, and interface identifiers shown in this tutorial are LAB\/EXAMPLE values and must be adapted to match your production environment.<\/p>\n<pre>\n[ Internet Client ]\n  IP: 198.51.100.45\n        |\n        | (Inbound HTTPS Request to 203.0.113.10:443)\n        v\n+-------------------------------------------------------+\n| Firewall Ingress: ethernet1\/1                         |\n| Zone: Untrust                                         |\n|                                                       |\n| PAN-OS Packet Processing Engine:                      |\n|  1. NAT Policy Lookup   -&gt; Translate IP to 192.168.20.10|\n|  2. Security Evaluation -&gt; Allow Untrust to DMZ       |\n|                            Destination: 203.0.113.10  |\n|                                                       |\n| Firewall Egress: ethernet1\/2                          |\n| Zone: DMZ                                             |\n+-------------------------------------------------------+\n        |\n        | (Translated Packet: 198.51.100.45 -&gt; 192.168.20.10:443)\n        v\n[ Internal Web Server ]\n  IP: 192.168.20.10\n<\/pre>\n<h2>Example Addressing and Objects<\/h2>\n<p>Before configuring rules on the firewall, define standardized address and service objects. Using structured object names simplifies maintenance and auditing.<\/p>\n<table>\n<thead>\n<tr>\n<th>Object Type<\/th>\n<th>Object Name<\/th>\n<th>Value \/ IP Address<\/th>\n<th>Description<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Address<\/td>\n<td><code>H-Web-Server-Private<\/code><\/td>\n<td><code>192.168.20.10\/32<\/code><\/td>\n<td>LAB\/EXAMPLE internal IP address of the DMZ web server.<\/td>\n<\/tr>\n<tr>\n<td>Address<\/td>\n<td><code>H-Web-Server-Public<\/code><\/td>\n<td><code>203.0.113.10\/32<\/code><\/td>\n<td>LAB\/EXAMPLE public IP address assigned to the server.<\/td>\n<\/tr>\n<tr>\n<td>Zone<\/td>\n<td><code>Untrust<\/code><\/td>\n<td>Interface <code>ethernet1\/1<\/code><\/td>\n<td>External zone facing the ISP router.<\/td>\n<\/tr>\n<tr>\n<td>Zone<\/td>\n<td><code>DMZ<\/code><\/td>\n<td>Interface <code>ethernet1\/2<\/code><\/td>\n<td>Internal isolated zone hosting public-facing servers.<\/td>\n<\/tr>\n<tr>\n<td>Service<\/td>\n<td><code>service-https<\/code><\/td>\n<td><code>TCP 443<\/code><\/td>\n<td>Predefined standard HTTPS service object.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Prerequisites<\/h2>\n<p>Ensure the following network baseline exists before configuring Destination NAT:<\/p>\n<ul>\n<li>Zone definitions for <code>Untrust<\/code> and <code>DMZ<\/code> are active on the firewall.<\/li>\n<li>Interface <code>ethernet1\/1<\/code> is assigned to the <code>Untrust<\/code> zone with a public IP configuration or connection to the ISP layer.<\/li>\n<li>Interface <code>ethernet1\/2<\/code> is assigned to the <code>DMZ<\/code> zone with IP address <code>192.168.20.1\/24<\/code> acting as the default gateway for the web server.<\/li>\n<li>A Virtual Router exists with a default route (<code>0.0.0.0\/0<\/code>) pointing to the ISP upstream router.<\/li>\n<li>The web server at <code>192.168.20.10<\/code> has its local default gateway set to <code>192.168.20.1<\/code> and accepts connections on TCP port 443.<\/li>\n<\/ul>\n<h2>Step-by-Step GUI Configuration<\/h2>\n<p>Configuring Destination NAT requires creating Address Objects, a NAT Policy rule, and an accompanying Security Policy rule.<\/p>\n<p>For the related outbound configuration, see the <a href=\"https:\/\/networkfix.in\/tutorials\/palo\/palo-alto-source-nat-configuration\/\">Palo Alto Source NAT guide<\/a> and <a href=\"https:\/\/networkfix.in\/tutorials\/palo\/palo-alto-security-policy-configuration\/\">Palo Alto Security Policy guide<\/a>.<\/p>\n<h3>Step 1: Create Address Objects<\/h3>\n<ol>\n<li>Navigate to <strong>Objects &gt; Addresses<\/strong>.<\/li>\n<li>Click <strong>Add<\/strong> at the bottom of the screen.<\/li>\n<li>Name the first object <code>H-Web-Server-Private<\/code>, set <strong>Type<\/strong> to <code>IP Netmask<\/code>, and enter <code>192.168.20.10<\/code>. Click <strong>OK<\/strong>.<\/li>\n<li>Click <strong>Add<\/strong> again to create the public address object.<\/li>\n<li>Name the object <code>H-Web-Server-Public<\/code>, set <strong>Type<\/strong> to <code>IP Netmask<\/code>, and enter <code>203.0.113.10<\/code>. Click <strong>OK<\/strong>.<\/li>\n<\/ol>\n<h3>Step 2: Create the Destination NAT Rule<\/h3>\n<p>The NAT policy instructs the firewall to rewrite the packet destination address when an inbound connection hits the external interface.<\/p>\n<ol>\n<li>Navigate to <strong>Policies &gt; NAT<\/strong>.<\/li>\n<li>Click <strong>Add<\/strong> to create a new NAT rule.<\/li>\n<li>In the <strong>General<\/strong> tab, enter the rule name: <code>Inbound-DMZ-Web-NAT<\/code>.<\/li>\n<li>In the <strong>Original Packet<\/strong> tab:\n<ul>\n<li><strong>Source Zone<\/strong>: Click <strong>Add<\/strong> and select <code>Untrust<\/code>.<\/li>\n<li><strong>Destination Zone<\/strong>: Click <strong>Add<\/strong> and select <code>Untrust<\/code>. (Select the zone corresponding to the ingress interface where the public IP resides).<\/li>\n<li><strong>Destination Interface<\/strong>: Select <code>ethernet1\/1<\/code> (or leave as <code>any<\/code>).<\/li>\n<li><strong>Service<\/strong>: Select <code>service-https<\/code> or <code>any<\/code>.<\/li>\n<li><strong>Source Address<\/strong>: Select <code>any<\/code>.<\/li>\n<li><strong>Destination Address<\/strong>: Click <strong>Add<\/strong> and select <code>H-Web-Server-Public<\/code>.<\/li>\n<\/ul>\n<\/li>\n<li>In the <strong>Translated Packet<\/strong> tab:\n<ul>\n<li>Under <strong>Destination Address Translation<\/strong>, set <strong>Translation Type<\/strong> to <code>Dynamic IP and Port<\/code> or <code>Static IP<\/code> (select <code>Static IP<\/code> for 1-to-1 destination mapping).<\/li>\n<li><strong>Translated Address<\/strong>: Select <code>H-Web-Server-Private<\/code>.<\/li>\n<li><strong>Translated Port<\/strong>: Leave blank if the port remains 443. If you are forwarding a non-standard public port (for example, port 8443) to port 443, specify <code>443<\/code> here.<\/li>\n<\/ul>\n<\/li>\n<li>Click <strong>OK<\/strong>.<\/li>\n<\/ol>\n<h3>Step 3: Create the Inbound Security Policy Rule<\/h3>\n<p>In PAN-OS, NAT rules do not grant permission for traffic to flow. You must configure a security policy rule to explicit allow the packet. You must construct this security rule using specific address and zone combinations.<\/p>\n<ol>\n<li>Navigate to <strong>Policies &gt; Security<\/strong>.<\/li>\n<li>Click <strong>Add<\/strong> to create a rule. Place it above any generic deny rules.<\/li>\n<li>In the <strong>General<\/strong> tab, enter the name: <code>Allow-Inbound-DMZ-Web<\/code>.<\/li>\n<li>In the <strong>Source<\/strong> tab, set <strong>Source Zone<\/strong> to <code>Untrust<\/code> and <strong>Source Address<\/strong> to <code>any<\/code>.<\/li>\n<li>In the <strong>Destination<\/strong> tab:\n<ul>\n<li><strong>Destination Zone<\/strong>: Select <code>DMZ<\/code> (This is the <strong>Post-NAT<\/strong> zone where the physical destination host resides).<\/li>\n<li><strong>Destination Address<\/strong>: Select <code>H-Web-Server-Public<\/code> (This is the <strong>Pre-NAT<\/strong> public address that the client originally targeted).<\/li>\n<\/ul>\n<\/li>\n<li>In the <strong>Application<\/strong> tab, add <code>web-browsing<\/code> and <code>ssl<\/code>.<\/li>\n<li>In the <strong>Service\/URL Category<\/strong> tab, select <code>application-default<\/code>.<\/li>\n<li>In the <strong>Actions<\/strong> tab, ensure <strong>Action Setting<\/strong> is set to <code>Allow<\/code>. Enable <strong>Log at Session End<\/strong>.<\/li>\n<li>Click <strong>OK<\/strong>.<\/li>\n<\/ol>\n<h2>CLI Configuration<\/h2>\n<p>You can execute the same configuration through the PAN-OS Command Line Interface (CLI). Access the firewall via SSH and enter configuration mode.<\/p>\n<pre>\nconfigure\n<\/pre>\n<p>Define the private and public address objects:<\/p>\n<pre>\nset address H-Web-Server-Private ip-netmask 192.168.20.10\/32\nset address H-Web-Server-Public ip-netmask 203.0.113.10\/32\n<\/pre>\n<p>Configure the Destination NAT policy rule:<\/p>\n<pre>\nset rulebase nat rules Inbound-DMZ-Web-NAT from Untrust to Untrust source any destination H-Web-Server-Public service service-https destination-translation translated-address H-Web-Server-Private\n<\/pre>\n<p>Configure the matching Security Policy rule:<\/p>\n<pre>\nset rulebase security rules Allow-Inbound-DMZ-Web from Untrust to DMZ source any destination H-Web-Server-Public application [ ssl web-browsing ] service application-default action allow log-end yes\n<\/pre>\n<p>Review your changes before applying them:<\/p>\n<pre>\nshow config diff\n<\/pre>\n<p>Commit the changes to the active configuration:<\/p>\n<pre>\ncommit\n<\/pre>\n<p><em>CAUTION: Committing configurations updates the active rulebase. Ensure that your rule criteria do not accidentally match broader production traffic.<\/em><\/p>\n<h2>How the Traffic Flows<\/h2>\n<p>Understanding packet processing logic in PAN-OS prevents common design and troubleshooting errors. PAN-OS processes inbound Destination NAT through a predictable set of stages:<\/p>\n<ol>\n<li><strong>Ingress Processing:<\/strong> An IP packet arrives on interface <code>ethernet1\/1<\/code> (Zone: <code>Untrust<\/code>). Source IP: <code>198.51.100.45<\/code>, Destination IP: <code>203.0.113.10<\/code>, Destination Port: <code>TCP 443<\/code>.<\/li>\n<li><strong>NAT Policy Evaluation:<\/strong> The firewall performs a NAT rule lookup based on the original criteria:\n<ul>\n<li>Source Zone: <code>Untrust<\/code><\/li>\n<li>Destination Zone: <code>Untrust<\/code> (Zone associated with ingress interface)<\/li>\n<li>Destination IP: <code>203.0.113.10<\/code><\/li>\n<\/ul>\n<p>        The firewall matches <code>Inbound-DMZ-Web-NAT<\/code>. It notes the translated destination address (<code>192.168.20.10<\/code>).\n    <\/li>\n<li><strong>Route Lookup (Post-NAT Destination):<\/strong> The firewall checks the Virtual Router table for the route to the <em>translated<\/em> destination (<code>192.168.20.10<\/code>). The routing table indicates that <code>192.168.20.10<\/code> is reachable via interface <code>ethernet1\/2<\/code> in the <code>DMZ<\/code> zone.<\/li>\n<li><strong>Security Policy Evaluation:<\/strong> The firewall evaluates security rules using a unique hybrid match:\n<ul>\n<li><strong>Source Zone:<\/strong> <code>Untrust<\/code> (Original ingress zone)<\/li>\n<li><strong>Destination Zone:<\/strong> <code>DMZ<\/code> (<strong>Post-NAT<\/strong> zone determined by the route lookup)<\/li>\n<li><strong>Destination Address:<\/strong> <code>203.0.113.10<\/code> (<strong>Pre-NAT<\/strong> address requested by the client)<\/li>\n<\/ul>\n<p>        The packet matches rule <code>Allow-Inbound-DMZ-Web<\/code> and access is granted.\n    <\/li>\n<li><strong>Packet Rewriting and Egress:<\/strong> The firewall rewrites the IP packet header destination address to <code>192.168.20.10<\/code> and forwards the frame out interface <code>ethernet1\/2<\/code> toward the server.<\/li>\n<\/ol>\n<h2>Verification<\/h2>\n<p>Verify that your NAT and security policies match incoming traffic using operational CLI testing tools and session monitors.<\/p>\n<h3>1. Test NAT Rule Match<\/h3>\n<p>Run the <code>test nat-policy<\/code> command to verify that inbound traffic hits your NAT configuration:<\/p>\n<pre>\ntest nat-policy ingress-interface ethernet1\/1 source 198.51.100.45 destination 203.0.113.10 protocol 6 destination-port 443\n<\/pre>\n<p>The command output should display the matching rule name and the translation destination:<\/p>\n<pre>\nInbound-DMZ-Web-NAT; Dynamic translation IP...\nResult: 192.168.20.10:443\n<\/pre>\n<h3>2. Test Security Policy Match<\/h3>\n<p>Run the <code>test security-policy-match<\/code> command using the <strong>Post-NAT Zone<\/strong> and <strong>Pre-NAT Destination IP<\/strong>:<\/p>\n<pre>\ntest security-policy-match from Untrust to DMZ source 198.51.100.45 destination 203.0.113.10 protocol 6 destination-port 443 application ssl\n<\/pre>\n<p>Verify that the output confirms a match on rule <code>Allow-Inbound-DMZ-Web<\/code> with an action of <code>allow<\/code>.<\/p>\n<h3>3. Active Session Table Inspection<\/h3>\n<p>Initiate an HTTPS connection from an external client to <code>203.0.113.10<\/code>. While the connection is active, query the active firewall sessions filtering by the internal server IP:<\/p>\n<pre>\nshow session all filter destination 192.168.20.10\n<\/pre>\n<p>Identify the Session ID from the output list, then view session details:<\/p>\n<pre>\nshow session id 12345\n<\/pre>\n<p>Confirm the session details output shows the double-sided flow structure:<\/p>\n<pre>\nc2s flow: 198.51.100.45[49152] -&gt; 203.0.113.10[443] (Untrust)\ns2c flow: 192.168.20.10[443] -&gt; 198.51.100.45[49152] (DMZ)\n<\/pre>\n<h2>Troubleshooting<\/h2>\n<p>When inbound connections to the translated server fail, systematically analyze symptoms using the operational workflow below.<\/p>\n<h3>Symptom 1: Traffic is Dropped by Default Deny Rule<\/h3>\n<ul>\n<li><strong>Evidence:<\/strong> Traffic logs show log entries for destination <code>203.0.113.10<\/code> hit the <code>interzone-default<\/code> or <code>cleanup<\/code> deny rule.<\/li>\n<li><strong>Root Cause:<\/strong> The security policy configuration uses incorrect parameters. You likely configured the destination zone as <code>Untrust<\/code> instead of <code>DMZ<\/code>, or configured the destination IP as <code>192.168.20.10<\/code> instead of <code>203.0.113.10<\/code>.<\/li>\n<li><strong>Check:<\/strong> Verify the security policy parameters. Ensure the Destination Zone is set to <code>DMZ<\/code> (Post-NAT) and Destination Address is set to <code>203.0.113.10<\/code> (Pre-NAT).<\/li>\n<\/ul>\n<h3>Symptom 2: Connection Initiates but Fails with TCP SYN Timeout<\/h3>\n<ul>\n<li><strong>Evidence:<\/strong> Firewall session table shows state <code>INIT<\/code> or <code>TCP SYN SENT<\/code>, but the TCP handshake never completes.<\/li>\n<li><strong>Root Cause:<\/strong> Routing failure on the return path or host-level packet blocking.\n<ol>\n<li>The web server lacks a default gateway pointing back to the firewall&#8217;s DMZ interface (<code>192.168.20.1<\/code>).<\/li>\n<li>A host firewall on the server (for example, Windows Firewall or <code>iptables<\/code>) is dropping packets from external source subnets.<\/li>\n<\/ol>\n<\/li>\n<li><strong>Check:<\/strong> SSH to the web server and verify its default route. Ping <code>192.168.20.1<\/code> from the server. Check host firewall logs.<\/li>\n<\/ul>\n<h3>Symptom 3: NAT Rule Does Not Match<\/h3>\n<ul>\n<li><strong>Evidence:<\/strong> Run <code>test nat-policy<\/code> and the firewall responds with no rule matched or matches a general outbound rule.<\/li>\n<li><strong>Root Cause:<\/strong> Destination Zone in the NAT rule is incorrectly configured.<\/li>\n<li><strong>Check:<\/strong> In the NAT policy <strong>Original Packet<\/strong> tab, confirm that the Destination Zone is set to the zone of the receiving interface (<code>Untrust<\/code>), not the internal zone.<\/li>\n<\/ul>\n<h2>Common Mistakes<\/h2>\n<p>Avoid these frequent configuration errors when implementing destination NAT in PAN-OS:<\/p>\n<ul>\n<li><strong>Using the Post-NAT IP in the Security Policy:<\/strong> Entering the internal address (<code>192.168.20.10<\/code>) in the security policy destination address field will cause the rule to fail. PAN-OS requires the **Pre-NAT IP** (<code>203.0.113.10<\/code>) in the security policy rule.<\/li>\n<li><strong>Using the Pre-NAT Zone as the Security Destination Zone:<\/strong> Setting the security policy destination zone to <code>Untrust<\/code> causes access failure. The firewall evaluates security rules after determining the egress route, so the destination zone MUST be the **Post-NAT Zone** (<code>DMZ<\/code>).<\/li>\n<li><strong>Forgetting Proxy ARP:<\/strong> If the public address <code>203.0.113.10<\/code> is in the same IP subnet as interface <code>ethernet1\/1<\/code> but not explicitly assigned to the interface itself, the upstream ISP router will issue ARP requests for <code>203.0.113.10<\/code>. The firewall will not answer those ARP requests unless Proxy ARP is handled naturally by the NAT rule or configured on the interface.<\/li>\n<li><strong>Over-restricting Application Identification (App-ID):<\/strong> Setting the security rule App-ID to strictly <code>web-browsing<\/code> on port 443 can cause initial SSL\/TLS handshakes to drop before App-ID identifies the traffic. Include the <code>ssl<\/code> application in your security policy rule.<\/li>\n<\/ul>\n<h2>Production Considerations<\/h2>\n<p>When deploying Destination NAT in production enterprise networks, keep the following considerations in mind:<\/p>\n<h3>1. High Availability (HA) Synchronisation<\/h3>\n<p>In an Active\/Passive HA pair, NAT rules and address objects sync automatically across devices. Ensure that upstream switches or ISP routers process ARP changes smoothly during a failover event.<\/p>\n<h3>2. Source NAT (SNAT) for Hairpinning<\/h3>\n<p>If internal hosts in your LAN zone need to access the DMZ server using its public IP address (<code>203.0.113.10<\/code>), you must implement a &#8220;Hairpin NAT&#8221; policy. This requires an additional Source NAT rule to translate internal source IPs to the internal firewall interface IP so return traffic routes symmetrically through the firewall.<\/p>\n<h3>3. Vulnerability Protection and Security Profiles<\/h3>\n<p>Public-facing web servers receive continuous automated attacks from the internet. Always attach Security Profiles to your inbound access rule, including:<\/p>\n<ul>\n<li>Antivirus Profile<\/li>\n<li>Vulnerability Protection Profile<\/li>\n<li>URL Filtering Profile<\/li>\n<li>WildFire Analysis Profile<\/li>\n<\/ul>\n<h2>Summary<\/h2>\n<p>Completing a successful <strong>Palo Alto Destination NAT configuration<\/strong> requires strictly following the PAN-OS rule architecture:<\/p>\n<ul>\n<li><strong>NAT Policy:<\/strong> Source Zone = <code>Untrust<\/code>, Destination Zone = <code>Untrust<\/code>, Destination IP = <code>Pre-NAT Public IP<\/code>. Translated Destination = <code>Post-NAT Private IP<\/code>.<\/li>\n<li><strong>Security Policy:<\/strong> Source Zone = <code>Untrust<\/code>, Destination Zone = <code>Post-NAT Zone (DMZ)<\/code>, Destination IP = <code>Pre-NAT Public IP<\/code>.<\/li>\n<\/ul>\n<p>By keeping this distinction clear\u2014<strong>Pre-NAT IP with Post-NAT Zone<\/strong> for security rules\u2014you can publish internal applications cleanly and securely without unexpected policy drops.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn Palo Alto Destination NAT configuration with a practical real-life example, step-by-step configuration, verification and troubleshooting.<\/p>","protected":false},"author":2,"featured_media":522,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","rank_math_title":"","rank_math_description":"","rank_math_focus_keyword":"","_dpc-meta-title":"","_dpc-meta-description":"","_dpc-keyword":""},"categories":[5],"tags":[29,73,65,85,32,31],"class_list":["post-523","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-palo","tag-firewall-tutorial","tag-intermediate","tag-nat","tag-palo-alto-destination-nat-configuration","tag-palo-alto-networks","tag-pan-os"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.2 (Yoast SEO v28.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Palo Alto Destination NAT (DNAT) and Port Forwarding Guide<\/title>\n<meta name=\"description\" content=\"Learn Palo Alto destination NAT and port forwarding with a real web server 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