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Network Address Translation (NAT) Overview (RFC 3022/2663)
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Network Address Translation (NAT) Overview (RFC 3022/2663)

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  • 1. September 2013 Network Address Translation (NAT) NAT Inside NAT Outside External Address Range : 5.5.5.1 ~ 5.5.5.99 Private/Local Network Client 1 Client 2 10.1.1.1 10.1.1.2 NAT Outside External Address : 5.5.5.1 Private/Local Network Internet Server 1 Server 2 NAT 10.1.1.99 NAT Inside Public/Global/External Network Basic NAT Client 99 ... Network Address Port Translation (NAPT) 1.1.1.1 2.2.2.2 Client 1 Client 2 10.1.1.1 10.1.1.2 Server 1 Server 2 NAT 10.1.1.99 Outbound Traffic 1.1.1.1 2.2.2.2 Outbound Traffic Inbound Traffic Outbound Traffic Internet NAPT Client 99 ... Public/Global/External Network Inbound Traffic a 5000 10.1.1.1 80 1.1.1.1 Outbound Traffic 5000 5.5.5.1 80 1.1.1.1 a 5000 10.1.1.1 80 1.1.1.1 NAT Inside NAT Outside Binding IP IP 5.5.5.1 120s NAT Inside Lifetime 10.1.1.1 10.1.1.1 5000 1.1.1.1 80 IP Address Binding & Translation {10.1.1.1} to {5.5.5.1} 5.5.5.1 5000 1.1.1.1 80 Inbound Traffic IP 5.5.5.1 120s IP Port Binding Lifetime 5.5.5.1 1000 120s 10.1.1.1 5000 1.1.1.1 80 NAT Inside Lifetime 10.1.1.1 NAT Outside Port 10.1.1.1 5000 NAT Inside NAT Outside Binding IP 1000 5.5.5.1 80 1.1.1.1 IP Translation {5.5.5.1} to {10.1.1.1} 5.5.5.1 1000 1.1.1.1 80 NAT Outside IP Port 5.5.5.1 1000 120s Inbound Traffic Binding Lifetime Port 10.1.1.1 5000 Address Binding & Translation {10.1.1.1, 5000} to {5.5.5.1, 1000} Translation {5.5.5.1, 1000} to {10.1.1.1, 5000} b 5001 10.1.1.1 8080 2.2.2.2 5001 5.5.5.1 8080 2.2.2.2 5.5.5.1 5001 2.2.2.2 8080 10.1.1.1 5001 2.2.2.2 8080 5001 10.1.1.1 8080 2.2.2.2 10.1.1.1 5001 2.2.2.2 8080 b 1001 5.5.5.1 8080 2.2.2.2 5.5.5.1 1001 2.2.2.2 8080 c 5003 10.1.1.2 80 1.1.1.1 5003 5.5.5.2 80 1.1.1.1 5003 10.1.1.2 80 1.1.1.1 1002 5.5.5.1 80 1.1.1.1 10.1.1.2 5003 1.1.1.1 80 5.5.5.2 5003 1.1.1.1 80 10.1.1.2 5003 1.1.1.1 80 5.5.5.1 1002 1.1.1.1 80 6000 10.1.1.99 8080 2.2.2.2 6000 5.5.5.99 8080 2.2.2.2 6000 10.1.1.99 8080 2.2.2.2 1003 5.5.5.1 8080 2.2.2.2 10.1.1.99 6000 2.2.2.2 8080 5.5.5.99 6000 2.2.2.2 8080 10.1.1.99 6000 2.2.2.2 8080 5.5.5.1 1003 2.2.2.2 8080 c Source TU Port Source IP Destination TU Port Destination IP 5000 10.1.1.1 80 1.1.1.1 Destination IP Destination TU Port Source IP Source TU Port 10.1.1.1 5000 1.1.1.1 80 www.netmanias.com d Basic NAT: NAT Binding Table Source TU Port Source IP Destination TU Port Destination IP NAT Inside NAT Outside Binding IP IP Lifetime 10.1.1.1 10.1.1.2 10.1.1.99 5.5.5.1 5.5.5.2 5.5.5.99 120s 120s 120s Binding Entry Creation at a Binding Entry Creation at b Binding Entry Creation at c 5000 10.1.1.1 80 1.1.1.1 Destination IP Destination TU Port Source IP Source TU Port NAPT: NAT Binding Table NAT Inside NAT Outside IP Port IP Port Binding Lifetime 10.1.1.1 10.1.1.1 10.1.1.2 10.1.1.99 5000 5001 5003 6000 5.5.5.1 5.5.5.1 5.5.5.1 5.5.5.1 1000 1001 1002 1003 120s 120s 120s 120s Binding Entry Creation at a Binding Entry Creation at b Binding Entry Creation at c Binding Entry Creation at d 10.1.1.1 5000 1.1.1.1 80 Netmanias ONE-SHOT

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