DHCP y iptables

subnet 192.168.1.0 netmask 255.255.255.0 {
range 192.168.1.50 192.168.1.99;
option domain-name-servers 200.33.146.162;
option routers 192.168.1.100;
option broadcast-address 192.168.1.255;
default-lease-time 600;
max-lease-time 7200;
}

iptables
/etc/rc.local

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128

exit 0