• SonicOS 7 Rules and Policies
• Access Rules
  • Setting Firewall Access Rules
    • About Stateful Packet Inspection Default Access Rules
    • About Connection Limiting
    • Using Bandwidth Management with Access Rules
      • Enabling Bandwidth Management on an Access Rule
    • Configuring Access Rules
      • Configuring Access Rules for IPv6
      • Configuring Access Rules for NAT64
      • Access Rules for DNS Proxy
      • User Priority for Access Rules
      • Displaying Access Rules
        • By Zones
        • By Column
      • Configuring Access Rules for a Zone
    • Enabling and Disabling Access Rules
    • Editing Access Rules
    • Deleting Access Rules
    • Restoring Access Rules to Default Settings
    • Displaying Access Rule Traffic Statistics
  • Access Rule Configuration Examples
    • Enabling Ping
    • Blocking LAN Access for Specific Services
    • Allowing WAN Primary IP Access from the LAN Zone
• NAT Rules
  • About NAT in SonicOS
  • About NAT Load Balancing
    • Determining the NAT LB Method to Use
    • Caveats
    • How Load Balancing Algorithms are Applied
    • Sticky IP Algorithm Examples
      • Example One - Mapping to a Network
      • Example Two - Mapping to an IP Address Range
  • About NAT64
    • Use of Pref64::/n
  • About FQDN-based NAT
  • About Source MAC Address Override
  • Viewing NAT Policy Entries
    • Changing the Display
    • Filtering the Display
    • Displaying Information about Policies
  • Adding or Editing NAT or NAT64 Policies
  • Deleting NAT Policies
  • Creating NAT Rule Policies: Examples
    • Creating a One-to-One NAT Policy for Inbound Traffic
    • Creating a One-to-One NAT Policy for Outbound Traffic
    • Inbound Port Address Translation via One-to-One NAT Policy
    • Inbound Port Address Translation via WAN IP Address
    • Creating a Many-to-One NAT Policy
    • Creating a Many-to-Many NAT Policy
    • Creating a One-to-Many NAT Load Balancing Policy
    • Creating a NAT Load Balancing Policy for Two Web Servers
    • Creating a WAN-to-WAN Access Rule for a NAT64 Policy
    • DNS Doctoring
• Routing Rules
  • About Routing
    • About Metrics and Administrative Distance
      • About Metrics
      • About Administrative Distance
    • Route Advertisement
    • ECMP Routing
    • Policy-based Routing
    • Policy-based TOS Routing
    • PBR Metric-based Priority
    • Policy-based Routing and IPv6
    • OSPF and RIP Advanced Routing Services
      • About Routing Services
        • Protocol Type
        • Maximum Hops
        • Split-Horizon
        • Poison Reverse
        • Routing Table Updates
        • Subnet Sizes Supported
        • Autonomous System Topologies
      • OSPF Terms
    • Drop Tunnel Interface
    • App-based Routing
  • Rules and Policies > Routing Rules
    • Configuring Routing Rules
      • Adding Static Routes
      • Probe-Enabled Policy-based Routing Configuration
• Content Filter Rules
  • About Content Filtering Rules (CFS)
    • About Content Filter Rules
    • About UUIDs for CFS Policies
    • About Content Filter Objects
    • How CFS Works
  • Configuring CFS Policies
    • About the Content Filter Rule Table
      • Searching the Content Filter Rule Table
    • Adding a Content Filter Rule
    • Editing a Content Filter Rule
    • Deleting Content Filter Rules
• App Rules
  • About App Rules
    • What are App Rules?
      • About App Rules Policies
      • About App Rules Capabilities
    • Benefits of App Rules
    • How Does Application Control Work?
    • About App Rules Policy Creation
    • Licensing App Rules and App Control
    • Terminology
  • Rules and Policies > App Rules
    • Configuring an App Rules Policy
    • Using the App Rule Wizard
  • Verifying App Rules Configuration
    • Useful Tools
      • Wireshark
      • Hex Editor
  • App Rules Use Cases
    • Creating a Regular Expression in a Match Object
    • Policy-based Application Rules
    • Logging Application Signature-based Policies
    • Compliance Enforcement
    • Server Protection
    • Hosted Email Environments
    • Email Control
    • Web Browser Control
    • HTTP Post Control
    • Forbidden File Type Control
    • ActiveX Control
    • FTP Control
      • Blocking Outbound Proprietary Files Over FTP
      • Blocking Outbound UTF-8 / UTF-16 Encoded Files
      • Blocking FTP Commands
    • Bandwidth Management
    • Bypass DPI
    • Custom Signature
    • Reverse Shell Exploit Prevention
      • Generating the Network Activity
      • Capturing and Exporting the Payload to a Text File Using Wireshark
      • Creating a Match Object
      • Defining the Policy
• Endpoint Rules
• SonicWall Support
  • About This Document

Creating a One-to-One NAT Policy for Inbound Traffic

A one-to-one NAT policy is the most commonly used type of NAT policy on SonicWall security appliances. It allows you to translate an external public IP addresses into an internal private IP address. When paired with an Allow access rule, this NAT policy allows any source to connect to the internal server using the public IP address; the firewall handles the translation between the private and public address. With this policy in place, the firewall translates the server’s public IP address to the private IP address when connection requests arrive via the WAN interface (by default, the X1 interface).

You also need to create the access rule that allows anyone to make HTTP connections to the web server through the web server’s public IP address, and also create the NAT policy.

The mirror (reflexive) policy for this one-to-one inbound NAT policy is described in Creating a One-to-One NAT Policy for Outbound Traffic.

To conceal the internal server’s real listening port, but provide public access to the server on a different port, refer to the example configuration described in Inbound Port Address Translation via One-to-One NAT Policy.

To create a one-to-one policy for inbound traffic

1. Navigate to the POLICY | Rules and Policies > Access Rules page.

   

2. Click +Add to display the Adding Rule dialog.

3. Enter in the values shown in Option choices: Access Rule for One-to-one inbound traffic example.

   Option choices: Access Rule for One-to-one inbound traffic example

   Option	Value
   Action	Allow
   Source Zone/Interface	WAN
   Source Address	Select the zone that the server is in
   Source Port/Services	Select a port; the default is Any if Source Port/Services is configured, the access rule filters the traffic based on the source port defined in the selected service object/group. The service object/group selected must have the same protocol types as the ones selected in Port/Services.
   Port/Services	HTTP
   Destination Zone/Interface	webserver_public_ip (the address object containing the server’s public IP address)
   User Include	All (default)
   User Exclude	None (default)
   Schedule	Always (default)
   Comment	Enter a short description
   Enable Logging	Selected
   Allow Fragmented Packets	Selected
   All other options	Deselected

4. Click Add. The rule is added. You can also continue with Access Rules setting up additional policies.
5. Navigate to the POLICY | Rules and Policies > NAT Rules page.
6. Click +Add to display the Adding NAT Rule dialog.

7. Configure the values shown in the Option Choices: One-to-one Inbound NAT Policy table.

   Option Choices: One-to-one Inbound NAT Policy

   Option	Value
   Original Source	Any
   Translated Source	Original
   Original Destination	webserver_public_ip
   Translated Destination	webserver_private_ip
   Original Service	HTTP
   Translated Service	Original
   Inbound Interface	X1
   Outbound Interface	Any NOTE: Select Any rather than the interface that the server is on.
   Comment	Enter a short description
   Enable NAT Policy	Checked
   Create a reflexive policy	Not checked

8. Click Add and then click Close.

When you are done, attempt to access the web server’s public IP address using a system located on the public internet. You should be able to successfully connect. If not, review this section, and the Creating a One-to-One NAT Policy for Outbound Traffic section, and ensure that you have configured all required settings correctly.