Randomize DNS servers

[Tim Gavin]

I should have mentioned, these are in two big IP blocks, and I'm
merging them into one.  They're set up as a /21 and a /22.



On Tue, Jun 8, 2010 at 14:25, John Hascall <john at iastate.edu> wrote:
>
>> I have several DNS servers that are lower performance than I would
>> like.  Until such time as I can afford to replace them, is there a way
>> in DNS (serving around 2000 clients) that I can assign a group of DNS
>> servers, and assign them randomly?  I.E., one user gets DNS1 & DNS2,
>> another clent gets DNS3 & DNS1, and the next gets DNS3 & DNS2.
>
> Assuming you are serving multiple subnets, you can include
> an 'option domain-name-servers ...' statement in each subnet:
>
>        subnet 10.10.199.128 netmask 255.255.255.224 {
>                ...
>                option domain-name-servers
>                        129.186.1.200, 129.186.78.200, 129.186.140.200;
>        }
>        subnet 129.186.199.128 netmask 255.255.255.224 {
>                ...
>                option domain-name-servers
>                        129.186.142.200, 129.186.140.200, 129.186.1.200;
>        }
>
> In our case, our config file is built by software from a database,
> so we can easily have the order randomized, but you could certainly
> do it by hand if that's how you make your config file.
>
> John
>
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