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DH Selection For IPsec VPNs

Created by dave. Last edited by dave, 3 years and 327 days ago. Viewed 1,005 times. #1
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What DH value should I use for my IPsec tunnels?

As of March 2019


  • IKEv1 is still acceptable, there's no burning reason to choose IKEv2 over v1
DH Group:
  • ideal is DH-19 or DH-20
  • minimum for reasonable security is DH-14, going below that is not recommended
  • use AES-128 (or higher) with SHA-128 (or higher)
  • Always avoid DES
  • Avoid 3DES and/or MD5 if at all possible


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