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The XG Series hardware appliances will reach end-of-life (EOL) on March 31, 2025. Click here to see the XG to XGS migration documentation.

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https://docs.sophos.com/nsg/sophos-firewall/21.0/Help/en-us/webhelp/onlinehelp/index.html?contextId=network-neighbors-add-static

Add a static neighbor

A static neighbor entry allows you to bind a MAC address to an IP address and port. The firewall performs the neighbor lookup in the static neighbor table when it receives the request on a specific port. If an entry is not available in the table, the firewall will check the neighbor caches and add the MAC address if required.

  1. Go to Network > Neighbors (ARP–NDP).
  2. From the Show list, select Static neighbor table and click Add.

  3. Specify the settings.

    Option Description
    IP version Type of IP address
    IPv4/IPv6 address IP address of the host
    MAC address MAC address of the host
    Interface Physical interface on which the binding is to be done
    Add as a trusted MAC address to prevent a spoofing attempt Add the IP/MAC mapping to the trusted MAC list

  4. Click Save.