| | IKEv1 | |
| UDP port | 500 | 500, 4500 |
| Phases | Phase 1 (6/3 messages) Phase 2 (3 messages) | Phase 1 (4 messages) Phase 2 (2 messages) |
| Keepalives | No | Yes |
| Identity Hiding | Yes in main mode, No in aggressive mode | Yes |
| UDP/NAT | No | Yes |
| SA Negotiation | Responder selects initiator's proposal | Same as IKEV1, proposal structure simplified |
| Number of Msgs | 6–9 | 4–8 |
| EAP/CP | No | Yes |
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