ZyXEL Communications P-2304R-P1 Series User Manual

 Chapter 7 LAN

P-2304R-P1 Series User’s Guide

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You must enable NAT to use the Any IP feature on the ZyXEL Device. 

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.

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 ZyXEL Device) 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 ZyXEL Device 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 ZyXEL 
Device. 

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

Use this screen to set up the ZyXEL Device’s IP address and subnet mask. To access this 
screen, click Network > LAN > IP.

Figure 41   Network > LAN > IP