Strange Serial Numbers

I have a strange fact I didn't understand, when creating those DNS domains files at /var/named directory.

I have a Script who generates those small files, and in the Serial info it composes a number who is formed by:

YYYYMMDDhhmmss

Well, it works without problem, with one exception: it generates a Serial number in the file, but when we nslookup the Domain, it shows another Serial number.

Please, try this domain:

nslookup -type=Soa areadeteste.com.br 200.201.129.12

It returns the Serial Number 364478947 but inside the areadeteste.com.br DNS file, the Serial number is 20010617111011.

When I used as Serial a number with less digits, the nslookup showed the right number.

Questions:

. Is there a limitation in the lenght of the Serial Number? Could it be the reason?

. Where does it take the other Serial number from?

. Any idea about the problem?

Thanks a lot.

Mario Lima./
multisitesAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

vsamtaniCommented:
The serial number in the zone file has to fit in 4 bytes, ie it can be minimum 0 and maximum (2^32)-1 = 4294967296. The usual way of specifying zone file serial numbers is to use

YYYYMMDDnn

where nn is a counter for that day.

The bogus serial number 364478947 is the result of trying to interpet the too-long serial number in the zone file:

20010617111011 mod (2^32) = 364478947

Vijay

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
multisitesAuthor Commented:
Yeah, that's it. I will find another way, maybe taking out the century part of the year. Thanks a lot.
vsamtaniCommented:
You're welcome, and glad to have helped. I would recommend that you keep the century part of the year for your serial numbers, and instead drop the minutes and seconds.

YYYYMMDDnn is a de-facto standard for serial numbers of SOA records, and 2001061711 (1100 hrs, 17 June 2001) is a perfectly acceptable serial number.

Vijay
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Linux

From novice to tech pro — start learning today.