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NAT Port Mapping Calculator
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NAT Port Mapping Calculator
Calculate NAT/PAT port pool requirements and oversubscription
Internal Hosts
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Total internal devices NATed through public IP(s).
Avg Connections/Host
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Browsing: 20-50, heavy: 100+.
Peak Multiplier
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Peak over average. Typical: 1.5-3.0x.
Port Range Start
(1 - 65534)
Port Range End
(2 - 65535)
Public IPs
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Number of public IPs for NAT.
Calculate NAT Requirements
NAT/PAT Analysis
Recommendations
References:
RFC 3022 (Traditional NAT), RFC 4787 (NAT Requirements). Ephemeral ports: IANA 49152-65535, Linux 32768-60999.
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