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Article ID : # Last review : 2005-12-24 14:30:17

TTL (Time to Live) settings

  The TTL value, or 'Time To Live' was intended to be used to tell other servers how long to cache a DNS record for before checking again with the hosting server to see if it has changed. Most providers uses times around 48 hours. Using Microtech's DNS system you can set the TTL's as low as 60 seconds for resource records. This means changes to other servers replicate quickly in the event of a change. There must however be a balance between performance and TTL. Using a low TTL means that clients will be much more frequently making DNS lookups which not only slightly decrease your sites performance, but increase usage of the dns servers. Typically, we would consider most people with a static IP to use times of 3600 seconds to 14400 seconds (1 to 4 hours) for most A records. For records that are unlikely to change, such as NS records, set them to 2 days. Notes There are a few ISP's such as AOL may disregard the TTL you set in order to increase their own performance. This is in our opinion not a very wise thing to do, but you should be aware that there are a few large ISP's that do this. Most DNS servers will not cache a record for more than 1 week. TTL's are ALWAYS specified in seconds on Microtech's servers. When a client gets a message that a record 'does not exist', it will most likely be cached by the client for the TTL specified in the SOA record.

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