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Local Area Network (LAN) is a group of subnets regulated and ruled by router. The design of
network structure is related to what type of public IP addresses coming from your ISP.
The most generic function of Vigor router is NAT. It creates a private subnet of your own. As
mentioned previously, the modem will talk to other public hosts on the Internet by using
public IP address and talking to local hosts by using its private IP address. What NAT does is to
translate the packets from public IP address to private IP address to forward the right packets
to the right host and vice versa. Besides, Vigor router has a built-in DHCP server that assigns
private IP address to each local host. See the following diagram for a briefly understanding.
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Vigor router will exchange routing information with neighboring routers using the RIP to
accomplish IP routing. This allows users to change the information of the modem such as IP
address and the modems will automatically inform for each other.
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When you have several subnets in your LAN, sometimes a more effective and quicker way for
connection is the Static routes function rather than other method. You may simply set rules
to forward data from one specified subnet to another specified subnet without the presence
of RIP.
Vigor122 User's Guide
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