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OK. At this point, you've setup at least one authoritative server for your LAN. We'll assume its configured correctly. Now to setup your cache. Setup for your LAN is easy - list your authoritative server(s) for each of your zones - both the textual domains and the reverse IP domains. But how about Internet? This is a question that causes a bit of debate. It is quite possible, perfectly legal, and reasonably non-fattening to contact the root servers of the Internet directly. This means if your caching server needs to find the address for www.amfes.com - it will contact one of the servers listed for *.com addresses, ask for the addresses of the amfes.com domain, and then ask the amfes.com servers for www.amfes.com. Properly configured, this works. No argument, end of story. But . . . Consider the sheer volume of requests that the servers for *.com would have to handle if every single Internet connected computer queried for addresses in this manner. Consider also the physical transmission steps required for such lookups. Yes, the Internet can and will do it - but is there a better way? Unless you're responsible for a network with more than 250 computers - this is not only overkill - it will probably result in slower connections. Normally, Internet access is provided by an ISP (hopefully, a reasonably competent one). ALL of your Internet traffic, every single web page, file access, and DNS query - flows through that connection and that ISP's servers. At least 90% of the quality ISPs in business today provide caching DNS service for their customers. Unless your ISP has some bonehead adminstrators (and if they do - change your service, quick!) the odds are their DNS servers are reasonably well configured. Take advantage of them. Use your ISP's DNS servers as your source of Internet DNS for your own caching server. If you happen to try your own root lookups, and they work faster than going through your ISP's servers . . . I recommend contacting your ISP and having them check out their own configuration. Sometimes, people don't realize they have problem until someone else points it out - be helpful. Then, if they don't fix it . . . consider doing business with someone else. |
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