Firewall 
 
Firewall
:
EnabledDisabled
 
(WARNING: If you enabled Firewall, the modem can block such attack:Denial of Service, SYN Flooding, Ping of Death, TearDrop...etc)
 
SPI
:
EnabledDisabled
 
(WARNING: If you enabled SPI, all traffics initiated from WAN would be blocked, including DMZ, Virtual Server, and ACL WAN side.)