Linksys Linksys WRVS4400N, Руководство пользователя

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Chapter 2: Networking and Security
Basics
An Introduction to LANs
A Router is a network device that connects
multiple networks together and forward traffic
based on IP destination of each packet.
The Wireless-N Gigabit Security Router can connect your local area network (LAN) or a group of PCs
interconnected in your home or office to the Internet. You can use one public IP address from the ISP
through WAN port and use the router’s Network Address Translation (NAT) technology to share this single
IP address
NAT (Network Address Translation):
among all the users.
NAT technology translates IP
a
ddresses of a local area network to a The Router’s Network Address Port Translation (NAPT or NAT)
technology protects your network of PCs so users different IP address for the Internet. on the Internet
cannot “see” your PCs. This is how your LAN remains private. The Router protects your network by
inspecting the first packet coming in through the Internet port before delivery to the final destination on one
of the Ethernet ports. The Router inspects Internet port services like the web server, ftp server, or other
Internet
LAN: the computers and networking products that
applications, and, if allowed, it will forward the packet to the
appropriate PC on the LAN side.
make up your local network
Multiple Wireless-N Gigabit Security Routers can also be used to connect multiple LANs
together. This usually applies to a medium-sized or larger company where you want to
divide your network into multiple IP subnets to increase the intranet throughput and
reduce the size of the IP broadcast domain and its interference. In this case, you need one
WRVS4400Nv2 for each subnetwork and you can connect all the WAN ports to a second
level Router or switch to the Internet. Note that the second level Router only forwards
data packets through a wired network so you don’t have to use the Wireless-N Gigabit
Security Router. You can use any wired router in the Linksys family, e.g. RVS4000,
which has 4 LAN ports and 1 WAN port.
The following diagram shows an example that consists of two levels of routers and
multiple LANs inter-connected together. The wireless network is only available at the
first level of router to provide end user connections. The second level router can connect
to dedicated Server PCs or routers that aggregates traffic from different LANs.