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Sitecom wl 350 Manual

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Firewall Settings
The device provides a tight firewall by virtue of the way NAT works. Unless you
configure the router to the contrary, the NAT does not respond to unsolicited
incoming requests on any port, thereby making your LAN invisible to Internet
cyber attacks. However, some network applications cannot run with a tight
firewall. Those applications need to selectively open ports in the firewall to
function correctly. The options on this page control several ways of opening the
firewall to address the needs of specific types of applications.
Enable SPI: Place a check in this box to enable SPI. SPI ("stateful packet
inspection" also known as "dynamic packet filtering") helps to prevent cyber
attacks by tracking more state per session. It validates that the traffic passing
through that session conforms to the protocol. When the protocol is TCP, SPI
checks that packet sequence numbers are within the valid range for the
session, discarding those packets that do not have valid sequence numbers.
Whether SPI is enabled or not, the router always tracks TCP connection states
and ensures that each TCP packet's flags are valid for the current state.
TCP / UDP NAT Endpoint Filtering options control how the router's NAT
manages incoming connection requests to ports that are already being used.
Select one of the radio buttons.
o End Point Independent Once a LAN-side application has created a
connection through a specific port, the NAT will forward any incoming
connection requests with the same port to the LAN-side application
regardless of their origin. This is the least restrictive option, giving the
best connectivity and allowing some applications (P2P applications in
particular) to behave almost as if they are directly connected to the
Internet.
o Address Restricted The NAT forwards incoming connection requests
to a LAN-side host only when they come from the same IP address
with which a connection was established. This allows the remote
application to send data back through a port different from the one
used when the outgoing session was created.
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