ZyXEL Communications Prestige 642M series, User Manual

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Prestige 642M Series ADSL Bridge
Internet Access 3-1
Chapter 3
Internet Access
This chapter shows you how to configure the LAN as well as the WAN
of your Prestige for Internet access
.
3.1 Factory Ethernet Defaults
The Ethernet parameters of the Prestige are preset in the factory with the following values:
1.
IP address of 192.168.1.1 with subnet mask of 255.255.255.0 (24 bits).
These parameters should work for the majority of installations. If you wish to change the factory defaults or
to learn more about TCP/IP then please read on.
3.2 TCP/IP Parameters
3.2.1 IP Address and Subnet Mask
Just as houses on the same street share a common street name so too do computers on the same LAN share
a common network number.
Where you obtain your network number depends on your particular situation. If the ISP or your network
administrator assigns you a block of registered IP addresses, follow their instructions in selecting the IP
addresses and the subnet mask.
The subnet mask specifies the network number portion of an IP address. Your Prestige automatically
computes the subnet mask based on the IP address that you entered. You do not need to change the subnet
mask computed by the Prestige unless you are instructed to do so.
3.2.2 Private IP Addresses
Every machine on the Internet must have a unique address. If your networks are isolated from the Internet,
e.g., only between your two branch offices, you can assign any IP addresses to the hosts without problems.
However, the Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of IP
addresses specifically for private networks:
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
You can obtain your IP address from the IANA, from an ISP or assigned from a private network. If you
belong to a small organization and your Internet access is through an ISP then ISP can provide you with the
Internet addresses for your local networks. On the other hand, if you are part of a much larger organization
then you should consult your network administrator for the appropriate IP addresses.
Note: Regardless of your particular situation, do not create an arbitrary IP address; always follow the
guidelines above. For more information on address assignment, please refer to RFC 1597, Address
Allocation for Private Internets and RFC 1466, Guidelines for Management of IP Address Space.