ZyXEL Communications P-660HWP-D1, User Manual

Page: 96 / 374

Chapter 6 LAN Setup
P-660HWP-D1 User’s Guide
96
"
You must enable NAT/SUA to use the Any IP feature on the P-660HWP-D1.
6.2.4.1 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 P-
660HWP-D1) 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 P-660HWP-D1.
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 P-660HWP-D1) by looking at the
MAC address in its ARP table.
2 When the computer cannot locate the default gateway, an ARP request is broadcast on
the LAN.
3 The P-660HWP-D1 receives the ARP request and replies to the computer with its own
MAC address.
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 P-
660HWP-D1.
5 When the P-660HWP-D1 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 P-660HWP-D1 and
the Internet as if it is in the same subnet as the P-660HWP-D1.
6.3 Configuring LAN IP
Click LAN to open the IP screen. See Section 6.1 on page 91 for background information.
Figure 49 LAN IP