Chapter 20 DNS

Figure 240 ADVANCED > DNS > DHCP

The following table describes the labels in this screen.

Table 118 ADVANCED > DNS > DHCP

LABEL

DESCRIPTION

DNS Servers

The ZyWALL passes a DNS (Domain Name System) server IP address to the

Assigned by DHCP

DHCP clients.

Server

 

 

 

Selected Interface

Select an interface from the drop-down list box to configure the DNS servers for

 

the specified interface.

 

 

DNS

These read-only labels represent the DNS servers.

 

 

IP

Select From ISP if your ISP dynamically assigns DNS server information (and

 

the ZyWALL's WAN IP address). Use the drop-down list box to select a DNS

 

server IP address that the ISP assigns in the field to the right.

 

Select User-Definedif you have the IP address of a DNS server. Enter the

 

DNS server's IP address in the field to the right. If you chose User-Defined, but

 

leave the IP address set to 0.0.0.0, User-Definedchanges to None after you

 

click Apply. If you set a second choice to User-Defined, and enter the same IP

 

address, the second User-Definedchanges to None after you click Apply.

 

Select DNS Relay to have the ZyWALL act as a DNS proxy. The ZyWALL's

 

LAN, DMZ or WLAN IP address displays in the field to the right (read-only). The

 

ZyWALL tells the DHCP clients on the LAN, DMZ or WLAN that the ZyWALL

 

itself is the DNS server. When a computer on the LAN, DMZ or WLAN sends a

 

DNS query to the ZyWALL, the ZyWALL forwards the query to the ZyWALL's

 

system DNS server (configured in the DNS System screen) and relays the

 

response back to the computer. You can only select DNS Relay for one of the

 

three servers; if you select DNS Relay for a second or third DNS server, that

 

choice changes to None after you click Apply.

 

Select None if you do not want to configure DNS servers. You must have

 

another DHCP sever on your LAN, or else the computers must have their DNS

 

server addresses manually configured. If you do not configure a DNS server,

 

you must know the IP address of a computer in order to access it.

 

 

Apply

Click Apply to save your changes back to the ZyWALL.

 

 

Reset

Click Reset to begin configuring this screen afresh.

 

 

 

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ZyWALL 2 Plus User’s Guide