Skip to main content


8x8 Support

How can I increase NAT security on my network?


Note: If available, it is recommended that you have an IT or networking professional manage your network security concerns.

Network Address Translation (NAT) is designed for IP address conservation. It enables private IP networks that use unregistered IP addresses to connect to the Internet. NAT operates on a router, usually connecting two networks together, and translates the private (not globally unique) addresses in the internal network into legal addresses, before packets are forwarded to another network.

Increasing NAT security may be an effective step in eliminating so-called "ghost calls" and other network interference issues. But because every customer's network setup differs, enhancing NAT security is not generally something 8x8 Technical Support can do for a customer or walk you through. What follows is a brief, general guideline. But it will be up to you or your IT administrator to manage security on your router.

General Path to Increasing NAT Security

  1. Log in to the web interface of the router attached to your 8x8 devices from a computer on the same network.
  2. Navigate to the Firewall settings.
  3. Find the NAT settings (if available).
  4. Review the examples below and strengthen security options as available.

Examples of Commonly Available NAT Security Options

  • Set UDP Enpoint Filering to Port and Address Restricted.
    Example shown: D-link DIR-655
  • Set NAT Filtering to Secured.
    Example shown: Netgear WNDR4500
  • If the NAT firewall is built into the general firewall, set the general Firewall to Enabled.
    Example shown: Linksys/Cisco router
  • Was this article helpful?