Linux iptables構成

#         
iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to 192.168.0.7:8080

#           (    IP      )
iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to 192.168.0.5:8080
iptables -t nat -A POSTROUTING -j MASQUERADE

#    nat  
iptables -F -t nat

#  nat    
iptables -t nat -L

#  IP      (0:  ,1:  )
cat /proc/sys/net/ipv4/ip_forward
#  IP  
echo "1">/proc/sys/net/ipv4/ip_forward