![]() ![]() ![]() The typical format of a serial number comprises date and unique serial number (YYYYMMDDNN), such as: 2009010801 - for the second edition (01) of the file on January 8, 2009. Thus, if you make modifications to a zone file, but leave unchanged its serial number, BIND will ignore your updated version. What happens is, when BIND loads a zone file at startup, it first looks up at its serial number and proceeds with processing the zone file only if its serial number is bigger than the last processed version. For optimal speed and efficiency, BIND (one of the most widely used DNS servers, designed for Unix-based operating systems) processes zone files into a different format. ![]() ![]() Serial number - Now this value has a special purpose. RNAME - This record specifies the email address of the person/authority that is in charge of managing the domain name, such as (here is replaced by '.'). MNAME - This is the zone's master DNS server (for example ) The SOA section begins with the zone's primary domain name (in this example we'll use ), after that it specifies the class of the zone, SOA, and then come the following seven specifications: Now, if we pay a little more attention to the SOA section, they might turn out to be also quite easy to understand. In the basic format of any DNS zone file, the time to live (TTL) field actually comes first in line followed by several other records (Start of Authority - SOA, records). The TTL value represents an essential part of the zone file of your domain name. If you need to make such changes, you will have to decrease the TTL value entry to several minutes to avoid any outdated data on your website. The TTL value can be set from one to several hours, if you are not planning any changes to your domain's DNS records in the meantime. The longer the TTL value is, the faster the domain resolution time periods will be. It represents the amount of time that a DNS record for a certain host remains in the cache memory of a DNS server after the latter has located the host's matching IP address.īy specifying TTL settings for a particular domain's DNS records, webmasters define the frequency of website content updates. On the right side, there was a stack of 7 hamburgers.TTL is an acronym for Time To Live and refers to the capability of the DNS servers to cache DNS records. Then they swam over to the second blanket of food.ģ 7 On the left side, there was a stack of 3 hamburgers. Since the greater amount of food is on the left, Gracie ate the food! On the right side, there was a stack 4 hamburgers. They swam over to the first blanket of food.ġ0 4 On the left side, there was a stack of 10 hamburgers. It looked like a whole family had been on a picnic and forgot to pick up their food! So when the most food was on the right side of the swamp, she let Lane have it. Greta thought Lester was so nice, and she didn’t want to be a greedy gator. So, when the most food was on the left, he let her have it. He knew that Gracie only liked to eat things that were on the left side of the swamp. Well that made Lane fall in LOVE with her!Įvery day, Gracie and Lane would swim through the swamp together and look for things to eat. Gracie was such a silly, gator that liked the boys! She would bat her long eyelashes at Lane and blow him kisses! Once upon a time in a swamp far, far away, lived ![]()
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