ZyXEL Communications Corporation VSG1435B101 Manuel D’Utilisation

VSG1435-B101 Series User’s Guide

DNS (Domain Name System) is for mapping a domain name to its corresponding 
IP address and vice versa. The DNS server is extremely important because 
without it, you must know the IP address of a machine before you can access it. 

In addition to the system DNS server(s), each WAN interface (service) is set to 
have its own static or dynamic DNS server list. You can configure a DNS static 
route to forward DNS queries for certain domain names through a specific WAN 
interface to its DNS server(s). The ZyXEL Device uses a system DNS server (in the 
order you specify in the Broadband screen) to resolve domain names that do not 
match any DNS routing entry. After the ZyXEL Device receives a DNS reply from a 
DNS server, it creates a new entry for the resolved IP address in the routing table.

In the following example, the DNS server 168.92.5.1 obtained from the WAN 
interface eth10.0 is set to be the system DNS server. The DNS server 10.10.23.7 
is obtained from the WAN interface VDSL_PoE/ppp0.1. You configure a DNS route 
for *example.com to have the ZyXEL Device forward DNS requests for the domain 
name mail.example.com through the WAN interface VDSL_PoE/ppp0.1 to the DNS 
server 10.10.23.7.