Your my-site.com domain will probably have a www and a mail subdomain, and they should remain obvious to all. You may want to adjust your DNS views so that to external users, your MySQL database server doesn't have the letters "DB" or "SQL" in the name, or that your firewall doesn't have the letters "FW" in its name either. This may good for ease of reference within the company, but to the Internet these names provide rapid identifiaction of the types of malicious exploits a hacker could use to break in. Web site security refers to anything that helps to guarantee the availability of the site, this is just one of many methods you can use.
Conclusion
DNS management is a critical part of the maintenance of any Web site. Fortunately, although it can be a little complicated, DNS modifications are usually infrequent, because the IP address of a server is normally fixed or static. This is not always the case. There are situations in which a server's IP address will change unpredictably and frequently, making DNS management extremely difficult. Dynamic DNS was created as a solution to this and is explained in Chapter 19, "Dynamic DNS".
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