>Which value it is that other DNS servers cache? I want to move all my
>domains to new IP's.
>
>refresh = 10800 (3 hours)
>retry = 1800 (30 mins)
>expire = 604800 (7 days)
>default TTL = 86400 (1 day)
It's actually none of the above. :)
All of those are from the SOA record. The top 3 are not relevant in this
case (they just determine how secondary DNS servers communicate with the
primary DNS server). The "default TTL" is sometimes used as the default
TTL value, but is now normally used in negative caching (when your DNS
server report that nonexistenthost.example.com doesn't exist, for example).
What really matters is the TTL values for the entries that are important
(for example, making sure that the MX record for example.com has a low TTL,
and that the A records for mail.example.com and www.example.com have low TTLs).
-Scott
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