DNS SOA standards for internal DNS

Posted on 2005-05-06
Last Modified: 2012-06-27
Please show me what good (standard), settings (i.e. Refresh #, Retry #, Expire #, Minimun #, and TTL for this record #'s), should be for an internal Server 2003 DNS SOA Record (not much changes as far as adding new fqdn's are concerned).

Also, what does "TTL for this record (DDDD:HH::MM::SS)", stand for?

Thank you!!

Question by:supercell29
    LVL 25

    Accepted Solution

    TTL= time to live
    DDDD:HH:MM::SS is days, hours, minutes seconds

    as far as what values you should have it really depends on your needs. But below are the standards that are defined by the RFC standards:

    SOA refresh:RFC1912 2.2 recommends a value between 1200 to 43200 seconds (20 minutes to 12 hours).
    SOA retry:  120-7200 seconds
    SOA expire:  RFC1912 recommends 2-4 weeks
    SOA min TTL:  RFC2308 suggests a value of 1-3 hours


    Author Comment

    Thank you.

    What I meant by "what does "TTL for this record (DDDD:HH::MM::SS)", stand for?", was "what does it do?" Also, " what should I set it to?"
    LVL 25

    Expert Comment

    here is a good web definition of dns TTL

    also from from sybex's MCSE 70-216 study guide:  "the elapsed time in seconds that a DNS server is allowed to cache any resource records from this database file.  This is the value that is sent out with all query responses from this zone file when the individual resource refore doesn't contain an overriding value."

    as noted in my first post, the min TTL RFC standard is 1-3 hours

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