At 01:37 PM 2/20/2003 +0530, Arvind wrote:
$TTL    86400
$ORIGIN localhost.
@                       1D IN SOA       @ root (
                                        1               ; serial (d. adams)
serial number of your zonefile.  If you update it, slaves will refresh the zone

                                        28800           ; refresh
etc etc.

                       1D IN NS        @
                        1D IN A         127.0.0.1


i can understand what 1d and other parameters are w.r.t. expiry, retry,
refresh etc but why is there a 1D in front of the IN records ? this is
something, which i fail to understand.
That's the TTL (time to live) of these records.

So, assume you have a 1 day TTL for an MX record, any resolving / caching nameserver which queries your nameserver for this record will cache the record for upto a day before making a fresh query.

srs



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