Am I missing something subtle here? My reading of Cheswick & Bellovin left me with the 
impression that a DMZ (c.f., Vietnam and Korean conflicts) looked more like this:

  INTERNET
     |
  EXTERIOR FIREWALL
     |
    (DMZ)---[various servers]
     |
  INTERIOR FIREWALL
     |
  INTRANET

> here is the configuration:
> 
>     INTERNET
>       |
>     FIREWALL------DMZ----[dns,www,ftp servers]
>       |
>      CO. Network
> 
> the DNS is in the DMZ. and this DNS is to have the 
> entries for www,ftp and the firewall external IP
> address facing the internet.
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