DHCP não fornece internet

Olá a todos, já pesquisei em muitos sites mas não consigo achar a solução para o meu problema, meu servidor DHCP não fornece Internet a os clientes, eu amarrei 2 computadores com o MAC, ele fornece o ip que eu amarrei, mas não acessa a internet.
Já tentei arrumar assistindo as recomendações do avena :

"caramba desde inicio do ano tem sempre gente pergunta isso. pessoal vamos dar uma pesquisa dentro do site / forum pra ver se nao te isso respondido.

nem vou pegar os link, so dou a dica que foi aprovada aqui no vol, mas nao publicada ainda....entao publiquei em outro lugar.


texto em: http://www.hardware.com.br/comunidade/v-t/1133084/#post5356588

video em: http://avena.blip.tv/file/4904449/

leia e veja que vai entender. e pesquisa na net se tiver duvidas"

mas mesmo assim, não consegui.
Obrigado as pessoas que me ajudarem.

vamos lá. posta seu dhcpd.conf para começar.

###########################################################################
ddns-update-style none;
default-lease-time 600;
max-lease-time 7200;
###########################################################################
authoritative;
###########################################################################
subnet 192.168.x.x netmask 255.255.x.x{
range 192.168.x.x 192.168.x.x;
option routers 192.168.x.x;
option broadcast-address 192.168.x.x;
option domain-name-servers 192.168.x.x;
default-lease-time 600;
max-lease-time 7200;
###########################################################################
host PC-TESTE01{hardware ethernet 00:08:54:x:x:x;fixed-address 192.168.x.x;}
host PC-TESTE02{hardware ethernet 00:08:54:x:x:x;fixed-address 192.168.x.x;}
}
###########################################################################

esse 192.168.x.x(domain-name-servers) tem um serviço DNS rodando? Se não melhor apontar para um DNS verdadeiro.

posta o resultado desses comandos

cat /etc/network/interfaces

cat /proc/sys/net/ipv4/ip_forward

iptables -t nat -L POSTROUTING

##############################################################################
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
##############################################################################
# The loopback network interface
auto lo
iface lo inet loopback
######################### The primary network interface ######################
allow-hotplug eth0
iface eth0 inet static
address 192.168.x.x
netmask 255.255.255.0
network 192.168.x.x
broadcast 192.168.x.255
gateway 192.168.x.x
# dns-* options are implemented by the resolvconf package, if installed
dns-nameservers 192.168.x.x
dns-search aetech.ind.br
########################## The second network interface ######################
allow-hotplug eth1
iface eth1 inet static
address 192.168.x.x
netmask 255.255.255.0
network 192.168.x.x
broadcast 192.168.x.255
gateway 192.168.x.x
# dns-* options are implemented by the resolvconf package, if installed
dns-nameservers 192.168.x.x
dns-search aetech.ind.br
#############################################################################

hawx:/etc/dhcp3# cat /proc/sys/net/ipv4/ip_forward
0

hawx:/etc/dhcp3# iptables -t nat -L POSTROUTING
Chain POSTROUTING (policy ACCEPT)
target prot opt source destination

O servidor DNS esta funcionando normalmente e e verdadeiro

seu problema é que não tá habilitado redirecionamento e mascaramento de pacotes.
para habilitar precisa de duas regras:
echo "1" > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o sua_eth_da_internet -j MASQUERADE

Infelizmente não funcionou, fis o que você me recomendou, iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE (eth0 placa de ENTRADA de Internet e eth1 placa de SAÍDA para rede local) e nada adiantou, continuo sem conseguir a cessar a Internet.
obrigado pela ajuda amigo

deu esse comando tbm?
echo "1" > /proc/sys/net/ipv4/ip_forward

Sim, eu dei os 2 comandos.

Mais ninguém para me ajuda ? :/

Alguém pode me dar uma luz , por favor ?