SMC Networks SMC Barricade SMCBR24Q User Manual page 68

Firewall
The default is enabled. If users disable the Firewall function, SPI, DoS, Block WAN Request will be
disabled, Remote Management will be enabled and Access Rules and Content Filter will be disabled.
SPI (Stateful Packet Inspection)
The Router's Firewall uses Stateful Packet Inspection to maintain connection information that passes
through the firewall. It will inspect all packets based on the established connection, prior to passing the
packets for processing through a higher protocol layer.
DoS (Denial of Service)
Protect internal networks from Internet attacks, such as SYN Flooding, Smurf, LAND, Ping of Death, IP
Spoofing and reassembly attacks.
Block WAN Request
This feature is designed to prevent attacks through the Internet. When it is enabled, the Router will drop
both the unaccepted TCP request and ICMP packets from the WAN side. The hacker will not find the
Router by pinging the WAN IP address. If DMZ is enabled, this function will be disabled.
SMCBR24Q User Manual
Page 68