MACROMEDIA COLDFUSION 5 - INSTALING AND CONFIGURING SERVER Manual page 149

Before You Install ColdFusion Server
Reverse translation entries (PTR records) are just the opposite and look like this:
IP Address
192.168.0.1
192.168.0.2
It is important that you configure your Web sites to have forward and reverse DNS
entries on your primary DNS server. If you are not responsible for maintaining your
primary DNS server, tell your DNS administrator to add both forward and reverse
entries for your explicit Web server names (www1.company.com,
www2.company.com, and so on).
Note
If both forward and reverse translations are not configured for each explicit Web
server, ClusterCATS will not operate correctly.
Local DNS servers
A local DNS server usually resides at the Web hosting facility. The local DNS server
stores its own local table of name translations for the Web sites that the browser has
visited. If a user enters a URL of a site in a browser that the browser has already
visited, it retrieves the host name-to-IP address translation from the local DNS
server's table. However, if a user enters a URL for a site that the browser on that
computer has never visited, the local DNS server must access the primary DNS
server on the Internet to resolve the name-to-IP mapping before the browser can
send a request to the appropriate Web server.
Resolving address mappings:
1
2
3
4
5
A user enters a Web site URL in the browser.
The browser checks the local DNS server for the name-to-IP address mapping.
The local DNS server typically resides at the facility where the Web servers are
hosted.
If the local DNS server does not have the mapping, it goes out to the Internet and
locates the primary DNS server to look up the name-to-IP address mapping.
If round-robin DNS is being used, the primary DNS server determines which
server in the cluster is next in line to receive the request.
The primary DNS server sends back the translation to the local DNS server, which
in turn sends it to the user's browser.
The browser can send an HTTP request to the correct Web server hosting the site.
URL
www1.company.com
www2.company.com
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