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• Stateful Packet Inspection – This is called a “stateful” packet
inspection because it examines the contents of the packet to
determine the state of the communications; i.e., it ensures that
the stated destination computer has previously requested the
current communication. This is a way of ensuring that all
communications are initiated by the recipient computer and
are taking place only with sources that are known and trusted
from previous interactions. In addition to being more rigorous
in their inspection of packets, stateful inspection firewalls also
close off ports until connection to the specific port is
requested.
When particular types of traffic are checked, only the
particular type of traffic initiated from the internal LAN will be
allowed. For example, if the user only checks FTP Service in
the Stateful Packet Inspection section, all incoming traffic will
be blocked except for FTP connections initiated from the local
LAN.
Stateful Packet Inspection allows you to select different
application types that are using dynamic port numbers. If you
wish to use the Stateful Packet Inspection (SPI) to block
packets, click on the Yes radio button in the “Enable SPI and
Anti-DoS firewall protection” field and then check the
inspection type that you need, such as Packet Fragmentation,
TCP Connection, UDP Session, FTP Service, H.323 Service,
and TFTP Service.
• When hackers attempt to enter your network, we can alert
you by e-mail – Enter your E-mail address. Specify your
SMTP and POP3 servers, user name, and password.