How Ipnp Works; General System Settings - ZyXEL Communications ZYAIR G-4100 User Manual

ZyAIR G-4100 User's Guide
The iPnP feature does not apply to a computer using either a dynamic IP address or a static IP address
that is in the same subnet as the ZyAIR's IP address.
You must enable NAT to use the iPnP feature.

3.4.1 How iPnP Works

Address Resolution Protocol (ARP) is a protocol for mapping an Internet Protocol address (IP address)
to a physical machine address, also known as a Media Access Control or MAC address, on the local
area network. IP routing table is defined on IP Ethernet devices (the ZyAIR) to decide which hop to
use, to help forward data along to its specified destination.
The following lists out the steps taken, when a computer tries to access the Internet for the first time
through the ZyAIR.
When a computer (which is in a different subnet) first attempts to access the Internet, it sends
1.
packets to its default gateway (which is not the ZyAIR) by looking at the MAC address in its ARP
table.
When the computer cannot locate the default gateway, an ARP request is broadcast on the LAN.
2.
The ZyAIR receives the ARP request and replies to the computer with its own MAC address.
3.
The computer updates the MAC address for the default gateway to the ARP table. Once the ARP
4.
table is updated, the computer is able to access the Internet through the ZyAIR.
When the ZyAIR receives packets from the computer, it creates an entry in the IP routing table so it
5.
can properly forward packets intended for the computer.
After all the routing information is updated, the computer can access the ZyAIR and the Internet as if
it is in the same subnet as the ZyAIR.
3.5

General System Settings

Click ADVANCED and then SYSTEM to open this screen.
3-2 General System Setup