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IMPORTANT
SNS 3.x versions have reached End of Maintenance since July 1st, 2024.
We recommend that you update your SNS firewalls to a version with maintenance to guarantee the protection of your infrastructure.

# Network Settings tab

## IPv6 support

Enable IPv6 support on this Firewall | Enables support for IPv6 on the firewall. To find out which modules support IPv6 and what changes have been made to the various modules in the administration interface, please refer to the section Enabling IPv6 in this guide. IMPORTANT As this action is irreversible, you are advised to back up your configuration before enabling support. To revert to IPv4 support only, you will need to reset your configuration to its factory settings before you can restore the backup of this configuration. Reset your configuration by pressing the reset button if your appliance has one, or by using the “defaultconfig” CLI command in console mode.

## Proxy server

The firewall uses a proxy to access the Internet | Select this option to enable the fields below it and to allow the firewall to use an HTTP proxy in order to access the Internet securely. This field is used by ActiveUpdate and LicenceUpdate.
Server | This field makes it possible to specify the object corresponding to the server that the firewall will use as a proxy.
Port | This field allows specifying the port used by the firewall to contact the proxy.
Identifier | This field allows defining an ID that the firewall will use to authenticate with a proxy.
Password | Define a password that the firewall will need in order to access the proxy server.

## DNS resolution

### List of DNS servers used by the firewall

DNS servers allow the firewall to resolve (find out IP addresses based on a host name) objects or hosts configured in “Automatic” DNS resolution.

Add | Clicking on this button will add a new line to the table and will allow you to select a DNS server from the drop-down list.
Delete | Select the line to be removed from the table and click on Delete.
Move up | Moves the selected line above the previous line.
Move down | Moves the selected line below the next line.

Do note that if you delete all the DNS servers defined in the table, the firewall will then use Root DNS servers. These servers are found in the DNS configuration file (/usr/Firewall/Data/dns).