11.9 Need for NAT

Here are reasons to use NAT:

• To conserve IPv4 addressing space
• To provide public addressing for inbound web services (1:1 NAT)
• To translate outbound private addresses (PAT)
• To facilitate mergers between organizations where there is IP address overlap
• To avoid re-addressing initiatives

Note:

• Real Addresses = the address assigned to an internal host (non-NAT)
• Mapped Addresses = the NAT’d address that masks the Real addresses