Stateful Packet Inspection; Denial Of Service Attack; Ethernet Cabling - NETGEAR WGT634U - 108 Mbps Wireless Storage Router Reference Manual

Stateful Packet Inspection

Unlike simple Internet sharing routers, a firewall uses a process called stateful packet inspection to
ensure secure firewall filtering to protect your network from attacks and intrusions. Since
user-level applications such as FTP and Web browsers can create complex patterns of network
traffic, it is necessary for the firewall to analyze groups of network connection states. Using
Stateful Packet Inspection, an incoming packet is intercepted at the network layer and then
analyzed for state-related information associated with all network connections. A central cache
within the firewall keeps track of the state information associated with all network connections.
All traffic passing through the firewall is analyzed against the state of these connections in order to
determine whether or not it will be allowed to pass through or rejected.

Denial of Service Attack

A hacker may be able to prevent your network from operating or communicating by launching a
Denial of Service (DoS) attack. The method used for such an attack can be as simple as merely
flooding your site with more requests than it can handle. A more sophisticated attack may attempt
to exploit some weakness in the operating system used by your router or gateway. Some operating
systems can be disrupted by simply sending a packet with incorrect length information.

Ethernet Cabling

Most Ethernet networks now use unshielded twisted pair (UTP) cabling. UTP cable has eight
wires arranged in four twisted pairs, and terminated with an RJ45 connector. Normal straight-
through UTP Ethernet cable follows the EIA568B standard as described in
Table B-1. UTP Ethernet cable wiring, straight-through
Pin Wire color
1 Orange/White
2 Orange
3 Green/White
4 Blue
5 Blue/White
6 Green
7 Brown/White
8 Brown
Network, Routing, Firewall, and Basics
Preliminary - Go to http://kbserver.netgear.com/products/wgt634U.asp for final manual
Preliminary Manual for the 108 Mbps Wireless Media Router WGT634U
Signal
Transmit (Tx) +
Transmit (Tx) -
Receive (Rx) +
Receive (Rx) -
Table B-1.
B-11