Re: DNS resolution order with multihomed host

DanielP <dpradoSIN@xxxxxxxxxxxxxx> wrote:
> Hello,
>
> I have one host with two IPs (10.X.X.X & 194.X.X.X) and i want it to
> be resolved always in the same order:
> -. 10.X.X.X
> -. 194.X.X.X
>
> I make the requests from 192.168.X.X
>
> I have disabled these options in the DNS server:
> -. Enable round robin
> -. Enable netmask ordering
>
> In the begining it resolves the dns name in the correct order, but
> suddenly it changes the order.

As close as you can come to resolving in a particular order is to enable
Netmask ordering with Round Robin disabled. Then DNS will send out the
addresses with the closest match first. Since neither of these addresses are
on your subnet, even with Netmask ordering disabled, I think DNS will use
the closest match of the first octet, which would be the 194 record. But, I
could be wrong about this, I've not found a way to get DNS to return a
particular record in a particular order when the subnet doesn't match any
record.

I did run a test against a Win2k DNS, I set up a scenario simular to yours
with simular records. I was able to get DNS to return the same record every
time by enabling round robin running a query with round robin enabled, then
disabling round robin. DNS used the same order in all subsequent queries. I
can't say it will happen every time from now on, because there is no real
way to tell DNS which order to return records on a particular query if the
subnet is not a match.


--
Best regards,
Kevin D. Goodknecht Sr. [MVP]
Hope This Helps
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