Best way to run Bind on public DNS servers??

[Kaya Saman]

Hi all,

this is the first time I'm going to be playing around with a setup like 
this so I'd like to get some advice:

I would like to run a master/slave configuration of Bind servers but am 
confused about how to implement such a setup and the underlying network 
fabric involved!!

First up, currently in my lab I am running an authoritative DNS server 
through NAT so when people make queries it goes through port 53 on my 
Cisco 857's ADSL interface then reaches the server with an internal 
private IP address.

I know that I can use 2 different public IP addresses and implement this 
via NAT opening up static NAT definitions from both WAN IP's to internal 
private IP's of the servers; however..... is this the best practice or 
should I give the servers public addresses on one of their NICs then run 
the named service from their???

I plan to upgrade to a Cisco 1800 series which has two routable ports in 
either Ethernet or ADSL and Ethernet configurations and has a managed 8 
port switch which I am sure can be included to be outside the NAT making 
it easy to tie the servers in to the network.

I've never dealt with a setup like this before as everything I've done 
so far has been behind NAT so I'm a little confused about how to go 
about it..... I know this is probably more of a thing for the Cisco 
Netpro forum but since I am going to be dealing with Bind there maybe a 
way I can get around with NAT depending on what the experts or more 
experienced people say!

Many thanks for any responses!

Best regards,

Kaya