DNS tutor needed
Barry Margolin
barmar at genuity.net
Mon Apr 15 14:55:06 UTC 2002
In article <a97uj1$l8q at pub3.rc.vix.com>, scratch <wmedia at xtra.co.nz> wrote:
>
>> > $TTL 259200
>>
>> Rather generous default TTL, sound remote server will honour
>> this and cache data for 3 days, great when everything is stable
>> if that is what you want, but whilst setting up.....
>
>Would 43200 be better? Or less?
43200-86400 is a common range.
>
>>
>> > @ IN SOA server.my.own.domain.
>my.email.address.
>> > (
>> > 20020103015 ; serial
>>
>> This serial is too big, serial number arithmetic leaves just
>> enough room for YYYYMMDDNN, changing these is a pain, but better
>> do it now, then wonder why when you query the serial in future
>> it doesn't show the number you entered.
>
>So whats the best way to change it if its a pain? (I thought YYYYMMDDNNN was
>acceptable......?)
Serial numbers can be up to about 4x10^10, i.e. a maximum of 10 digits. A
common serial number format is YYYYMMDDNN -- drop one of the N's at the end
and you should be fine.
>> > 604800 ; expire - 7 days
>> > 7200 ) ; default_ttl - 2
>hours
>>
>> That's negative TTL not default.
>
>Sorry?
Since BIND 8, the last field in the SOA record has been the TTL of negative
caching, not the default TTL. The $TTL directive sets the default TTL.
--
Barry Margolin, barmar at genuity.net
Genuity, Woburn, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
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