Default Firewall Rules A number of sample firewall rules are enabled by default, providing a basic set of filtering for the network. Rule Purpose Allow-Ping Permit ping from WAN to device. Allow-DHCP-Renew Permit traffic from WAN to any zone. Allow-DHCPv6 Permit IPV6 traffic from WAN to IPV6 device. Allow-ICMPv6-Forward Permit ICMP traffic from WAN to any zone. Allow-ICMPv6-Input Permit ICMP traffic from WAN to IPV6 device.