Distributing DNS load via DHCP

[Carlos Vicente]

Hi Jeff,

I haven't tried this particular trick, but we were considering a
similar option at uoregon last year, and ended up deploying anycast
instead, which we're very happy with so far.

I'd be happy to share the implementation details if you're interested.

--
Carlos Vicente
University of Oregon

On Fri, Dec 16, 2011 at 9:55 AM, Jeff Wieland <wieland at purdue.edu> wrote:
> We have a fairly large pool of address, and we'd like to distribute
> the DNS load on this pool between two DNS servers.
>
> Roughly, what I was thinking of doing is:
>
> group {
>   default-lease-time 21600;
>   max-lease-time 28800;
>   option domain-name "myuni.edu";
>   option domain-name-servers 192.168.1.5, 192.168.1.6;
>
>   subnet 192.168.128.0 netmask 255.255.240.0 {
>       authoritative;
>       option routers 192.168.128.1;
>       # Select the DNS server order by examining the last bit of
>       # the hardware address
>       if (suffix(binary-to-ascii(2, 8, ":", hardware), 1) = "1") {
>           option domain-name-servers 192.168.1.6, 192.168.1.5;
>       } else {
>           option domain-name-servers 192.168.1.5, 192.168.1.6;
>       }
>
>       pool {
>           deny dynamic bootp clients;
>           range 192.168.128.11 192.168.143.254;
>       }
>   }
> }
>
>
> Or would I be better off doing something with classes/subclasses?
> I'm concerned about the performance impact of the if statement.
>
> --
>         Jeff Wieland            |         Purdue University
>  Network Systems Administrator  |        ITN&S Data Networks
>      Voice: (765)496-8234       |        155 S. Grant Street
>       FAX: (765)494-6620        |   West Lafayette, IN 47907-2115
>
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