Chapter 8 WAN Screens

Table 30 NETWORK > WAN Route (continued)

LABEL

DESCRIPTION

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.

 

 

8.4 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.

Table 31 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

 

 

 

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.

"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.

8.5DNS 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.

1The ISP tells you the DNS server addresses, usually in the form of an information sheet, when you sign up. If your ISP gives you DNS server addresses, manually enter them in the DNS server fields.

2If your ISP dynamically assigns the DNS server IP addresses (along with the ZyWALL’s WAN IP address), set the DNS server fields to get the DNS server address from the ISP.

 

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ZyWALL 2 Plus User’s Guide