ZyXEL Communications P-334W - Manual (Page 82)

Prestige 334W User’s Guide
6-4 LAN Screens
You must enable NAT/SUA to use the Any IP feature on the Prestige.
6.4.1 How Any IP 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 Prestige) 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 Prestige.
Step 1. When a computer (which is in a different subnet) first attempts to access the Internet, it sends
packets to its default gateway (which is not the Prestige) by looking at the MAC address in its ARP
table.
Step 2. When the computer cannot locate the default gateway, an ARP request is broadcast on the LAN.
Step 3. The Prestige receives the ARP request and replies to the computer with its own MAC address.
Step 4. The computer updates the MAC address for the default gateway to the ARP table. Once the ARP
table is updated, the computer is able to access the Internet through the Prestige.
Step 5. When the Prestige receives packets from the computer, it creates an entry in the IP routing table so it
can properly forward packets intended for the computer.
After all the routing information is updated, the computer can access the Prestige and the Internet as if it is in
the same subnet as the Prestige.
6.5 Configuring IP
Click LAN to open the IP screen.