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Barracuda NextGen Firewall X

This Firmware Version Is End-Of-Support

As of December 1st, 2018, all new sales for Barracuda NextGen Firewall X Series products have ceased. Only renewals of software and hardware subscriptions for a maximum of one year are available for a limited time. December 1st 2019: All Barracuda Firewall X-Series sales will cease; neither new sales nor any renewals will be available. If you currently hold a maintenance and support contract, you will continue to receive our award-winning support and services until your contract expires, or until the End of Live definition as described in the End of Support and End of Life Information.

Example - Configuring an Access Rule for the Barracuda Email Security Gateway

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When deploying a Barracuda Email Security Gateway behind the Barracuda NextGen Firewall X-Series, configure a Destination NAT (DNAT) access rule to route SMTP traffic to the Email Security Gateway. For more information on the Barracuda Email Security Gateway, see: Overview.

This article provides instructions on how to configure an access rule for the following setup:

DNAT_spamfw.png

Before you Begin

Install and configure the Barracuda Email Security Gateway in your LAN as described in: Deployment Behind the Corporate Firewall.

Step 1. (Optional) Create a Service Object for SMTPS

To also forward SMTPS traffic to your Email Security Gateway, create a service object to redirect the traffic to port 465. For more information, see Service Objects.

Use the following settings:

  • Protocol – TCP
  • Port Range – 465

ssl_smtp_67_01.png

Step 2. Configure a DNAT Access Rule

Create a DNAT access rule that forwards all incoming SMTP traffic to the IP address of the Email Security Gateway.

  1. Go to the FIREWALL > Firewall Rules page.
  2. Click Add Access Rule to create a new firewall rule.
  3. In the Add Access Rule window, enter a name and description for the rule.
  4. Specify the following settings:

    ActionConnectionSourceNetwork ServicesDestinationRedirected To
    DNATNo SNATInternetSMTP, SMTP SSL (optional)
    Enter the public IP address of the X-Series Firewall. E.g.: 62.99.0.50Enter the IP address or select the network object for your Barracuda Email Security Gateway. E.g.: 10.10.10.3

    dnat_smtp_67_00.png

  5. Click Save.

Step 2. Verify the Order of the Access Rules

Because rules are processed from top to bottom in the rule set, arrange your access rules in the correct order. Make sure that this rule is the first access rule that matches SMTP traffic on the WAN port of the X-Series Firewall.

After adjusting the order of the rules in the rule set, click Save.

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