ZyXEL Communications 5 Series - Manual (Page 159)

ZyWALL 5/35/70 Series User’s Guide
Chapter 8 WAN Screens 159
8.9 WAN IP Address Assignment
Every computer on the Internet must have a unique IP address. If your networks are isolated
from the Internet, for instance, 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.
You can obtain your IP address from the IANA, from an ISP or have it assigned by a private
network. If you belong to a small organization and your Internet access is through an ISP, the
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, 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.
8.10 DNS Server Address Assignment
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.
The ZyWALL can get the DNS server addresses in the following ways.
Allow between
WAN and WLAN Select this check box to forward NetBIOS packets from the WLAN to the WAN and
from the WAN to the WLAN.
Clear this check box to block all NetBIOS packets going from the WLAN to the
WAN and from the WAN to the WLAN.
Allow Trigger Dial Select this option to allow NetBIOS packets to initiate calls.
Apply Click Apply to save your changes back to the ZyWALL.
Reset Click Reset to begin configuring this screen afresh.
Table 37 NETWORK > WAN (Route) (continued)
LABEL DESCRIPTION
Table 38 Private IP Address Ranges
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255