ZyXEL Communications HS100/HS100W manual How Any IP Works, Any IP Example Application

HomeSafe User’s Guide

use the computer to access the Internet without changing the network settings, even when the IP addresses of the computer and the HomeSafe are not in the same subnet.

Figure 5-1 Any IP Example Application

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 HomeSafe’s IP address.

)You must enable NAT/SUA to use the Any IP feature on the HomeSafe.

5.4.1How 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 HomeSafe) 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 HomeSafe.

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 HomeSafe) 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 HomeSafe 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 HomeSafe.

5.When the HomeSafe 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 HomeSafe and the Internet as if it is in the same subnet as the HomeSafe.

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