Simulate PAT overload mappings, calculate NAT table capacity, and visualize port exhaustion thresholds.
Simulate adding NAT entries to see the translation table grow.
| Platform | PAT Port Range | Ports per IP | Max Translations |
|---|---|---|---|
| Cisco IOS/IOS-XE | 1024–65535 | 64,512 | 64,512 × outside IPs |
| Cisco ASA | 1024–65535 (default) | 64,512 | Limited by xlate table memory |
| Linux iptables/nftables | 1024–65535 (default) | 64,512 | Limited by conntrack table size |
| Windows Server NAT | 1025–5000 (legacy) / 1024–65535 | 63,511 | Registry-tunable |
| RFC 4787 (BEHAVE) | Recommends preserving source port | — | Per-endpoint mapping |