IP Packet Filtering
Block:
-  Any packet coming into your network with a source address of your internal network 
 -  Any packet coming into your network not with a destination address of your internal network 
 -  Any packet leaving your network not with a source address of your internal network 
 -  Any packet leaving your network with a destination address of your internal network. 
 -  Any packet coming into your network or leaving your network with a private, loopback, or reserved source or destination address 
	
	-  10.x.x.x/8,
	
 -  172.16.x.x/12 
	
 -  192.168.x.x/16 
	
 -  127.0.0.0/8. 
	
 
 -  Source routed packets 
 -  Packets with the IP options field set
 -  Reserved, DHCP auto-configuration and Multicast addresses
	  
	  -  0.0.0.0/8 
	  
 -  169.254.0.0/16 
	  
 -  192.0.2.0/24 
	  
 -  224.0.0.0/4 
	  
 -  240.0.0.0/4