só vou abordar configuração bem simples DNS para sua própria maquina.

#########################################################>>


Dnsmaxq normalmente já esta instalado ele e uma dependência do networkmanager caso não esteja.

apt-get install dnsmasq

vamos ver no arquivo
leafpad /etc/default/dnsmasq

tem que esta + ou - assim essas 2 partes
ENABLED=1
CONFIG_DIR=/etc/dnsmasq.d,.dpkg-dist,.dpkg-old,.dpkg-new

vamos configurar

salvar arquivo original

mv /etc/dnsmasq.conf /etc/dnsmasq.conf_BK

criar arquivo de configuração

leafpad /etc/dnsmasq.conf

resolv-file=/etc/resolv.dnsmasq

salve e feche

crie um arquivo para consulta DNS externo.
leafpad /etc/resolv.dnsmasq

nameserver 189.38.95.95
nameserver 189.38.95.96
nameserver 200.176.2.10
nameserver 200.176.2.12

salve e feche

agora vamos fazer sua maquina consultar dnsmasq

leafpad /etc/resolv.conf

nameserver 127.0.0.1

agora vamos travar esse arquivo
chattr +i /etc/resolv.conf

salve e feche

OBS:
caso queira destravar para configura
chattr -i /etc/resolv.conf

vamos reniciar dnsmasq
service dnsmasq restart
ou
/etc/init.d/dnsmasq restart



teste
root@Fran:/home/fran# dig www.google.com

; <<>> DiG 9.8.4-rpz2+rl005.12-P1 <<>> www.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57012
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;www.google.com. IN A

;; ANSWER SECTION:
www.google.com. 70 IN A 74.125.234.145
www.google.com. 70 IN A 74.125.234.146
www.google.com. 70 IN A 74.125.234.147
www.google.com. 70 IN A 74.125.234.148
www.google.com. 70 IN A 74.125.234.144

;; AUTHORITY SECTION:
google.com. 42226 IN NS ns3.google.com.
google.com. 42226 IN NS ns1.google.com.
google.com. 42226 IN NS ns4.google.com.
google.com. 42226 IN NS ns2.google.com.

;; ADDITIONAL SECTION:
ns1.google.com. 41177 IN A 216.239.32.10
ns2.google.com. 41179 IN A 216.239.34.10
ns3.google.com. 41177 IN A 216.239.36.10
ns4.google.com. 41177 IN A 216.239.38.10

;; Query time: 44 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri Oct 25 08:18:44 2013
;; MSG SIZE rcvd: 248



pronto esta funcionando


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