Re: Web server and email server in different places with same domain name
- From: Tim <tefnz@xxxxxxxxxxxx>
- Date: Fri, 16 Dec 2005 13:17:16 +1300
On Thu, 15 Dec 2005 22:39:20 +0000, Jim Hicks wrote:
> edwards.kyle@xxxxxxxxx wrote:
>> Oh, I almost forgot. Once I update the DNS record how to I get DNS to
>> use the new record? Restarting the service won't do it.... thanks
>> again.
>>
> You need to change the serial number in the dns file to signal a change
> occurred.
> It is in the SOA stanza, and has the form: @ IN SOA
> dnsx.domain.com. goofy.domain.com. (
> 1212200501 ; serial
And that serial number order is BAD. If the date is being used as part of
the serial, it should be in the form YYYYMMDDxx (for example 2005121500),
rather than MMDDYYYY or DDMMYYY. This is because slave name servers check
that the master serial number is larger, and that can be guaranteed only
if the date is stored as year then month then day. Use of date in month
or day-first order can lead to strange failures, because of the way that
serial number comparisons are done. (serial numbers are manipulated as an
unsigned 32-bit integer, but the range wraps, so that a serial number of
2**32 -1 (= 4294967295) is less than 0). Because of these issues, a
simple sequential serial number, starting at 1, is often easier to use
than a date-based serial.
> 3600 ; refresh
> 7200 ; retry
> 604800 ; expire
> 36000 ; ttl
> )
That last field (labelled 'ttl') is used for negative responses - it sets
the timeout on a "No such record" response. Is 10 hours a good timeout
for such answers in your zone?
Tim
.
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