Details of SOA parameters used in DNS records:
Serial — The zone serial number, incremented when the zone file is modified, so the slave and secondary name servers know when the zone has been changed and should be reloaded.
Refresh — This is the number of seconds between update requests from secondary and slave name servers.
Retry — This is the number of seconds the secondary or slave will wait before retrying when the last attempt has failed.
Expire — This is the number of seconds a master or slave will wait before considering the data stale if it cannot reach the primary name server.
Minimum — Previously used to determine the minimum TTL, this is used for negative caching. This is the default TTL if the domain does not specify a TTL.
TTL (time to live) - The number of seconds a domain name is cached locally before expiration and return to authoritative nameservers for updated information.
source: http://knowledgelayer.softlayer.com
Serial — The zone serial number, incremented when the zone file is modified, so the slave and secondary name servers know when the zone has been changed and should be reloaded.
Refresh — This is the number of seconds between update requests from secondary and slave name servers.
Retry — This is the number of seconds the secondary or slave will wait before retrying when the last attempt has failed.
Expire — This is the number of seconds a master or slave will wait before considering the data stale if it cannot reach the primary name server.
Minimum — Previously used to determine the minimum TTL, this is used for negative caching. This is the default TTL if the domain does not specify a TTL.
TTL (time to live) - The number of seconds a domain name is cached locally before expiration and return to authoritative nameservers for updated information.
source: http://knowledgelayer.softlayer.com
0 comments:
Post a Comment