dnsreports agora diz "Open DNS servers"

Pessoal, como faço sempre verificações pelo www.dnsreports.com de meu dominio, agora tá dizendo que é um "Open DNS servers" conforme abaixo:


ERROR: One or more of your nameservers reports that it is an open DNS server. This usually means that anyone in the world can query it for domains it is not authoritative for (it is possible that the DNS server advertises that it does recursive lookups when it does not, but that shouldn't happen). This can cause an excessive load on your DNS server. Also, it is strongly discouraged to have a DNS server be both authoritative for your domain and be recursive (even if it is not open), due to the potential for cache poisoning (with no recursion, there is no cache, and it is impossible to poison it). Also, the bad guys could use your DNS server as part of an attack, by forging their IP address. Problem record(s) are:

Server 201.17.x.xxx reports that it will do recursive lookups. [test]


See this http://www.dnsreport.com/info/opendns.htm for info on closing open DNS servers.

Já fiz as alterações como diz acima incluindo o "recursive no;"
Só que as maquinas na rede interna que usa este server como servidor de dns passam a nao mais fazer consultas no dns, ficam sem navegar.
Tambem fiz a alteração para habilitar o recursion para a rede local, só que quando adiciono o range de ip da rede interna, o bind nao responde mais, nao consigo pingar nada atravez dele!!!

Alguma ajuda??
Sarge 3.1 r1 e BIND 9.2.4