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You can also use this procedure to specify glue records (IP addresses) when you're configuring white label name servers—name servers that have the same domain name as the hosted zone.For more information about configuring white label name servers (also known as vanity name servers or private name servers), see Configuring White Label Name Servers.Before I proceed with this article, the following are the MOST IMPORTANT points you should remember as otherwise you wouldnt understand bit. An A Record must ALWAYS contain IP address (map host to IP) Whenever you specify A record it must contain IP address on the Right side. A nameserver which gives non-authoritative answer is usually called 'LAME'. An example of lame delegation is ns1.is configured to have zone information about domain but ns2.was not configured properly and does not have any information about the domain.The A record is so important in DNS without which the meaning of mapping hostnames to IP would be absurd. Every domain must have atleast 2 nameservers and if i ask each of them, and if they have domain zone information, I will get authoritative answer. So ns1 will answer authoritatively wheras ns2 won't which will be 'lame' until it is set up properly.I am not sure how many would know that when somebody types a domain name in IE/firefox, the browser forwards the DNS request asking for ip address from the resolver of ISP (ISP Provider) and the resolver contacts the root servers and then systematically retrieves the IP address within a matter of few milliseconds. Glue records are A records that are associated with NS records to provide "bootstrapping" information to the NS records nameserver.Understanding DNS and its working is one of the most difficult computer engineering subject and yet most experienced network administrators struggle in this topic when it comes to DNS zone file writing. (see RFC 1912 section 2.3) In the above example we are mapping each NS records to IP address (A record) thus binding nameservers to IP (that is glue them).

If you just changed the record now, DNS resolvers all over the world who don't have the old data cached would instantly see the new IP address (

For A records, MX records, PTR records and the like there is a nice way to update a record while still not having inconsistent data.

What I mean by "inconsistent" is the following scenario: Suppose you have an A record for to the IP address with a "Time To Live" value set to 3600 (1 hour).

But DNS resolvers who do have this record cached (e.g.

DNS (Domain name system) may not be known to most people who use the Internet but it is the real invisible force driving the Internet without which everyone would be seeing numbers and IPs. Use the DOT in the end, whenever you specify a domain name in the DNS zone file.

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It's going to be upgraded soon anyway, but I don't know for sure if that will happen before March 11, so I want to update the DST issue in the simplest way possible. Is there any reason why updating the zoneinfo directory and /etc/localtime as on any other Linux server is insufficient?

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