Advise Requested regarding serial number for DDNS

Barry Margolin barmar at genuity.net
Fri May 12 15:14:55 UTC 2000


In article <20000512105329.A3121 at dns.net>,
Andras Salamon  <andras at dns.net> wrote:
>On Thu, May 11, 2000 at 05:15:37PM -0700, Brian Keves - NCS UAI Contractor wrote:
>> Each Dynamic Update seems to increment the serial number for the zone
>> and I'm going to run out of serial numbers fast using the current
>> strategy:
>> 
>>                                 2000051100      ; Serial
>> ;                               YYYYMMDDCC      ; Year, Month, Day, Count
>> 
>> Is there a limit to the number of digits I can use for the serial number?
>
>Yes: it is a 32 bit integer.  If regarded as unsigned, the range is
>0 to 2^32 - 1 =  4294967295.  If signed, then the range is -2^31 =
>-2147483648 to 2^31 -1 = 2147483647.

It's unsigned.

But you can't run out, because it's allowed to wrap around.  You would only
have a problem if more than 2 billion dynamic updates were performed
between slave server refreshes.

-- 
Barry Margolin, barmar at genuity.net
Genuity, Burlington, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.



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