Multiple choice

During which part of establishing an IPsec VPN tunnel in two sites would NAT-T detection occur?

  1. IKE Phase 1

  2. IKE Phase 2

  3. ISAKMP Phase 1

  4. ISAKMP Phase 2
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A Correct answer
Explanation

NAT-Traversal (NAT-T) detection occurs during the initial IKE Phase 1 exchange (specifically in the main or aggressive mode) to determine if there is a NAT device between the peers. If detected, the peers will encapsulate ESP packets in UDP port 4500.

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