Why DNS query shows different result for some hours?

[Corman 4u]

Thanks, Ralph.

I think you got the right point. Your comment is very helpful.

There is no communication between my own DNS server and 
DNS servers from the public service provider. (hereinafter public DNS)
When I registered my domain, I regiestered public DNSs for the domain name record.
Then my domain had a parking page such as Under construction'.
I am using dynamic IP, but it is almost like the static IP.
I've never seen my IP changed. I think it is because I am using the router, which I've never turned off.
Now I built my own DNS server on my machine and home page.
I registered my own DNS server in the domain name record (primary) and changed public DNSs into secondary and ternary because I didn't have my own secondary DNS.

I expected that my DNS server worked well because it is now primary,
as long as I don't turned off my machine and the router.
When my IP is changed or my machine is interruted, then access to my domain will be forwarded
to the previous parking page. (different IP address in each authority section)

Client's access to my domain --> client's DNS request to get the domain name record --> national DNS provides my DNS server IP if available --> client's DNS request to my own DNS server--> my own DNS server provides info of IP address


My dynamic IP is still the same. Synchnonization between public DNSs (my secondary and ternary) is sure;
however, not between my own DNS and public DNS servers.
I cannot change public DNS server
s record with my dynamic IP address.
In order to fulfill my intention, should I build my own secondary DNS and is it the only way?


Corman

2008/10/17 Ralph Janke <txwikinger at ubuntu.com>
>
> I am not 100% sure that I understand what you say.
>
> As I understand it, you have configured your domain name
> record to have your own machine as the first DNS server,
> and a server from a public service provider as the second.
>
> I do not understand if the DNS records for your domain between
> the two are synced. If not this needs to be done.
>
> DNS works in a redundant way. DNS servers will get the information
> from any one of the DNS servers that are in the domain name record.
> Therefore all DNS servers configured must have the same information.
> This can usually be done by configuring one primary and the other ones
> as secondary severs. However, I am not sure if you can do that in your
> situation.
>
> Then it is irrelevant which server is named in the authority section.
>
> However, it almost looks to me that your own machine is not always
> available to the outside and the other server does not have the right
> information.
>
> If you want to, you can send me to my email privately the information
> how you have set everything up, and I can have a look.
>
> Hope this helps,
>
> - Ralph
>
>
>
> Corman 4u wrote:
> > I have had a domain name and set up with 2 DNS servers from a public service
> > provider.
> > Recently, I changed one of DNS servers with my IP, which has my own DNS on
> > LINUX.
> > So first DNS of the domain is my DNS server and the second is one of DNS
> > servers of the public service provider.
> > When I query the domain, sometimes it works for hours; dig command shows my
> > IP in Answer Section.
> > But sometimes it doesn't work; dig command shows my IP (my DNS) or the DNS
> > server of the business service alternatively.
> > This situation is repeating for several days; it works well for several
> > hours, but doesn't for the next several hours.
> > While DNS query shows different result at each query, outside clients get
> > Gateway Timeout with code=DNS_TIMEOUT.
> > Is there anybody who knows the reason and how to fix this problem?
> >
> > Corman
> >
> >
>
>
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