Network Configuration Concepts 47exists on your network, enter the IP address 0.0.0.0 or leave the fieldblank.If you set the default router to 0.0.0.0 or leave it blank, the Webcachewill only be able to access devices that are in the same subnet as theWebcache.Domain Name System The Domain Name System (DNS) maps a numerical Internet Protocol (IP)address to a more meaningful and easy-to-remember name. When youneed to access another device on your network, you enter the name ofthe device, instead of its IP address. A Domain Name System server onyour network is contacted and asked the electronic form of the question,“What is the IP address of the destination device?”. The DNS server is amachine that keeps track of all the names and their equivalent numeric IPaddresses. The DNS server responds with the correct IP address (e.g.128.118.2.23), allowing the two devices to communicate with eachother.To enable the Domain Name System, you must setup a DNS server onyour network. If you are uncertain about how to do this, contact yournetwork administrator.The following Webcache features are only available if you have setup aDNS server: Access to the Webcache by DNS Name — You can access the Webinterface or Command Line Interface of the Webcache via its DNSname, rather than its IP address e.g. webcache.mycompany.com. Web Proxy Auto-Discovery — This protocol can be used toconfigure Web browsers on client machines in a Proxy Cachedeployment. For further information, see “Web Proxy Auto-Discovery(WPAD)” on page 53.Domain Name SystemSyntaxYou must use the following syntax for the Domain Name System hostname and domain name: Host Name The host name must be at least 1 character long. The host name must not exceed 63 characters long. The host name must be comprised of alphanumeric characters, -(hyphens) and _ (underscores).
