Chapter 21 DNS

Table 141 ADVANCED > DNS > DHCP

LABEL

DESCRIPTION

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.

 

 

21.10 Dynamic DNS

Dynamic DNS allows you to update your current dynamic IP address with one or many dynamic DNS services so that anyone can contact you (in NetMeeting, CU-SeeMe, etc.). You can also access your FTP server or Web site on your own computer using a domain name (for instance myhost.dhs.org, where myhost is a name of your choice) that will never change instead of using an IP address that changes each time you reconnect. Your friends or relatives will always be able to call you even if they don't know your IP address.

First of all, you need to have registered a dynamic DNS account with www.dyndns.org. This is for people with a dynamic IP from their ISP or DHCP server that would still like to have a domain name. The Dynamic DNS service provider will give you a password or key.

"You must go to the Dynamic DNS service provider’s website and register a user account and a domain name before you can use the Dynamic DNS service with your ZyWALL.

21.10.1 DYNDNS Wildcard

Enabling the wildcard feature for your host causes *.yourhost.dyndns.org to be aliased to the same IP address as yourhost.dyndns.org. This feature is useful if you want to be able to use, for example, www.yourhost.dyndns.org and still reach your hostname.

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ZyWALL 2WG User’s Guide