... Security And Flexible ManagementThe AD-204 utilizes NAT and SPI (stateful packet inspection) firewalls which inspect the contents ... DNS Relay, DDNS, IGMP snooping V1/2IGMP Multicast, UPnPSecurityNAT Firewall, SPI Firewall, MAC / IP / Packet / Application / URL Filtering, ... Based Configuration(HTTP), Remote management, Telnet management, Command Line Interface, SSL for TR-069, SNMP v1/2c, SNMP over ...