About the DNS-Proxy

The Domain Name System (DNS) is a network system of servers that translates numeric IP addresses into readable, hierarchical Internet addresses, and vice versa. DNS enables your computer network to understand, for example, that you want to reach the server at 200.253.208.100 when you type a domain name into your browser, such as www.example.com. With Fireware XTM, you have two methods to control DNS traffic: the DNS packet filter and the DNS-proxy policy. The DNS-proxy is useful only if DNS requests are routed through your XTM device.

When you create a new configuration file, the file automatically includes an Outgoing packet filter policy that allows all TCP and UDP connections from your trusted and optional networks to external. This allows your users to connect to an external DNS server with the standard TCP 53 and UDP 53 ports. Because Outgoing is a packet filter, it is unable to protect against common UDP outgoing trojans, DNS exploits, and other problems that occur when you open all outgoing UDP traffic from your trusted networks. The DNS-proxy has features to protect your network from these threats. If you use external DNS servers for your network, the DNS-Outgoing ruleset offers additional ways to control the services available to your network community.

To add the DNS-proxy to your XTM device configuration, see Add a Proxy Policy to Your Configuration.

If you must change the proxy definition, from the Firewall Polices / Edit page, you can modify the definition. .This page is separated into several tabs: Settings, Application Control, Traffic Management, Proxy Action, Scheduling, and Advanced.

Settings Tab

On the Settings tab, you can set basic information about a proxy policy, such as whether it allows or denies traffic, create access rules for a policy, or configure policy-based routing, static NAT, or server load balancing. The Settings tab also shows the port and protocol for the policy, as well as an optional description of the policy. You can use the settings on this tab to set logging, notification, automatic blocking, and timeout preferences.

Application Control Tab

If Application Control is enabled on your device, you can set the action this proxy uses for Application Control.

  1. Select the Application Control tab.
  2. From the Application Control Action drop-down list, select an application control action to use for this policy, or create a new action.
  3. Click Save.

For more information, see Enable Application Control in a Policy.

Traffic Management Tab

On the Traffic Management tab, you can select the Traffic Management action for the policy. You can also create a new Traffic Management action. For more information about Traffic Management actions, see Define a Traffic Management Action in v11.8.x and Lower and Add a Traffic Management Action to a Policy.

To apply a Traffic Management action in a policy:

  1. Select the Traffic Management tab.
  2. From the Traffic Management Action drop-down list, select a Traffic Management action.
    Or, to create a new Traffic Management action, select Create new and configure the settings as described in the topic Define a Traffic Management Action in v11.8.x and Lower.
  3. Click Save.

Proxy Action Tab

You can choose a predefined proxy action or configure a user-defined proxy action for this proxy. For more information about how to configure proxy actions, see About Proxy Actions.

To configure the proxy action:

  1. Select the Proxy Action tab.
  2. From the Proxy Action drop-down list, select the proxy action to use for this policy.
    For information about proxy actions, see About Proxy Actions.
  3. Click Save.

For the DNS-proxy, you can configure these categories of settings for a proxy action:

Scheduling Tab

On the Scheduling tab, you can specify an operating schedule for the policy. You can select an existing schedule or create a new schedule.

  1. Select the Scheduling tab.
  2. From the Schedule Action drop-down list, select a schedule.
    Or, to create a new schedule, select Create New and configure the settings as described in the topics Create Schedules for XTM Device Actions and Set an Operating Schedule.
  3. Click Save.

Advanced Tab

The Advanced tab includes settings for NAT, QoS, multi-WAN, and ICMP options.

To edit or add a comment to this proxy policy configuration, type the comment in the Comment text box.

For more information on the options for this tab, see:

See Also

About Proxy Policies and ALGs

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