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To accomplish its connected sharing task, NAT routers do something called
Packet Inspection. Part of this inspection process involves blocking unwanted
and un-requested packets trying to reach your LAN computers. It can also
involve forwarding ‘wanted’ packets to servers you might have running on
1your LAN.
Stateful Packet Inspection (SPI)
SPI is a little different than ordinary ‘packet inspection’. The basic
interpretation of SPI is that a router/firewall with SPI will protect you from
more attacks than a router without SPI. SPI means that the router will look at a
packet of information, examine it in some way, and determine what to do with
it (beyond simple routing). SPI routers not only understand TCP/IP, they
understand the kind of applications that are running on the protocol. This
understanding allows the router to filter out advanced forms of attacks on the
Internet like Denial of Service attacks.
Local IP settings
Allows user to modify the local IP settings. Most routers come configured to
set your LAN up in the 192.168.0.x range. Routers that let you change at least
the last two octets (192.168.x.x) are much more useful as your network
becomes more complex. There is also a security benefit to changing your local
IP settings from the default.
Virtual Private Network (VPN)
A VPN allows secure communication between computers or networks over a
public network like the Internet.
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