Which UDP port is used in Ipsec tunneling when NAT-T is in use? 09/18/2018 – by Mod_GuideK 0 Which UDP port is used in Ipsec tunneling when NAT-T is in use? A. 50 B. 4500 C. 500 D. 51 SHOW ANSWERSCorrect Answer: B Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.