Lan Tcp/Ip - ZyXEL Communications P-660H-61 User Manual

Chapter 7 LAN Setup
• Some ISPs choose to disseminate the DNS server addresses using the DNS server extensions of
IPCP (IP Control Protocol) after the connection is up. If your ISP did not give you explicit DNS
servers, chances are the DNS servers are conveyed through IPCP negotiation. The ZyXEL Device
supports the IPCP DNS server extensions through the DNS proxy feature.
Please note that DNS proxy works only when the ISP uses the IPCP DNS server extensions. It
does not mean you can leave the DNS servers out of the DHCP setup under all circumstances. If
your ISP gives you explicit DNS servers, make sure that you enter their IP addresses in the
DHCP Setup screen.

7.7.4 LAN TCP/IP

The ZyXEL Device has built-in DHCP server capability that assigns IP addresses and DNS servers to
systems that support DHCP client capability.
IP Address and Subnet Mask
Similar to the way houses on a street share a common street name, so too do computers on a LAN
share one 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.
If the ISP did not explicitly give you an IP network number, then most likely you have a single user
account and the ISP will assign you a dynamic IP address when the connection is established. If this
is the case, it is recommended that you select a network number from 192.168.0.0 to
192.168.255.0 and you must enable the Network Address Translation (NAT) feature of the ZyXEL
Device. The Internet Assigned Number Authority (IANA) reserved this block of addresses
specifically for private use; please do not use any other number unless you are told otherwise. Let's
say you select 192.168.1.0 as the network number; which covers 254 individual addresses, from
192.168.1.1 to 192.168.1.254 (zero and 255 are reserved). In other words, the first three numbers
specify the network number while the last number identifies an individual computer on that
network.
Once you have decided on the network number, pick an IP address that is easy to remember, for
instance, 192.168.1.1, for your ZyXEL Device, but make sure that no other device on your network
is using that IP address.
The subnet mask specifies the network number portion of an IP address. Your ZyXEL Device will
compute the subnet mask automatically based on the IP address that you entered. You don't need
to change the subnet mask computed by the ZyXEL Device unless you are instructed to do
otherwise.
Private IP Addresses
Every machine on the Internet must have a unique address. If your networks are isolated from the
Internet, for example, 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
• 172.16.0.0
120
— 10.255.255.255
— 172.31.255.255
ADSL Router Series User's Guide