DH Selection For IPsec VPNs
(2019-03-13)
Problem
What DH value should I use for my IPsec tunnels?As of March 2019
IKE:- IKEv1 is still acceptable, there's no burning reason to choose IKEv2 over v1
- 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
References
- some reddit thread somewhere which I can't find any more, yeah possibly sketchy AF maybe, but it's backed up by other places on the web
- DH group, October 2018:
https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk27054 - NCSC (UK) requirements for their tunnels, March 2019 https://www.ncsc.gov.uk/guidance/using-ipsec-protect-data
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