How to handle bind 9 as resolver on bad wireless links

[Marc Haber]

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On Thu, Aug 23, 2007 at 06:15:45PM +0800, Aggarwal Vivek-Q4997C wrote:
> Im having a network 20 K Subscribers. I want to install the DNS Server
> BIND-9.4.1 for 20 K Subs.
> 
> Can I anyone help me in dimensioning the DNS Server, in terms of Hard
> Disk and RAM (Memory) required.

I assume that you want to deliver DNS resolving services to your
subscribers.

I would absolutely go for multiple boxes, spread out to multiple
network locations. Maybe use anycast techniques to be able to add new
servers to the network without need to change client configuration.

I have made good experience with using dedicated IP addresses for the
resolver service to be able to dynamically re-route these addresses to
working systems in case one fails. Your network team is going to hate
you for the /32 routes in their table, but you'll end up with much
better end user service. 

Additionally, I would like to strongly advise against using the same
bind installations to host zone files. Do not load any zone files
(besides the basic ones of course) on any server that delivers
resolver services to customers.

Greetings
Marc

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