The Firewall page contains four panels: Firewall Rules, IPv4 SNAT, IPv4 DNAT, and IPv6 NAT. You can set specific rules on the Firewall Rules to filter the data forwarded between different device interfaces. Filtering conditions include the destination protocol and port, source IP address, destination IP address, and time. On the IPv4 SNAT panel, you can set source network address translation (SNAT) rules for Internet access of intranet users or other Source NAT purposes. On the IPv4 DNAT panel, you can publish intranet servers to the public network, and destination network address translation (DNAT) rules need to be set for Destination NAT. The NAT settings apply only when the device is deployed in route mode.