ZyXEL Communications P-660HW-Tx v3 Series User Manual page 134

Chapter 7 LAN Setup
without changing the network settings, even when the IP addresses of the
computer and the ZyXEL Device are not in the same subnet.
Figure 45 Any IP Example
192.168.10.1
192.168.10.1
The Any IP 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 ZyXEL Device's IP
address.
Note: You must enable NAT/SUA to use the Any IP feature on the ZyXEL Device.
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 ZyXEL Device) 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 ZyXEL Device.
When a computer (which is in a different subnet) first attempts to access the
1
Internet, it sends packets to its default gateway (which is not the ZyXEL Device)
by looking at the MAC address in its ARP table.
When the computer cannot locate the default gateway, an ARP request is
2
broadcast on the LAN.
The ZyXEL Device receives the ARP request and replies to the computer with its
3
own MAC address.
134
192.168.1.1
P-660HW-Tx v3 Series User's Guide