Ip Address And Subnet Mask; Dns Server Address Assignment - ZyXEL Communications NBG-418N v2 User Manual

Fig ure 69
LAN and WAN IP Addresses
The LAN parameters of the NBG-418N v2 are preset in the factory with the following values:
• IP address of 192.168.1.1 with subnet mask of 255.255.255.0 (24 bits)
• DHCP server enabled with 32 client IP addresses starting from 192.168.1.33.
These parameters should work for the majority of installations. If your ISP gives you explicit DNS server
address(es), read the embedded Web Configurator help regarding what fields need to be configured.
8.2.1 IP Addre ss a nd Sub ne t Ma sk
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. 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 NBG-418N v2, 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 NBG-418N v2 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 NBG-418N v2 unless you are instructed to do otherwise.
8.2.2 DNS Se rve r Addre ss Assig nm e nt
Use DNS (Domain Name System) to map a domain name to its corresponding IP address and vice versa,
for instance, the IP address of www.zyxel.com is 204.217.0.2. The DNS server is extremely important
because without it, you must know the IP address of a computer before you can access it.
Chapter 8 LAN
NBG-418N v2 User's Guide
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