Question regarding increasing rate limits

We plan to launch a VPN service offering IKEv2 support, and iOS clients will be supported, which require each VPN server’s domain to have a certificate. But IKEv2 [doesn’t support wildcard certificate ], which means we need to generate an unique certificate for each of the VPN servers.

We’d like use letsencrypt if possible, but the number of servers is quite large and we will add more servers pretty frequently. All servers will share a registered domain, meaning the rate limit will be reached very frequently.

Are we eligible to request a rate limit bump? Will letsencrypt deny it if it’s for VPN only?

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From https://letsencrypt.org/docs/rate-limits/,

Renewals are treated specially: they don’t count against your Certificates per Registered Domain limit, but they are subject to a Duplicate Certificate limit of 5 per week

So, effectively you can create certificates for 50 new VPN servers per week.

That seems like rather a lot, but if it’s not enough for you, you can still apply for and most likely receive an exemption.

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