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docker-ipsec-vpn-server
Docker image to run an IPsec VPN server, with IPsec/L2TP, Cisco IPsec and IKEv2
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
IPSEC-L2TP is built into everything. No clients required on Windows, Mac, Android, iOS, Linux, etc. Great Docker container for cutting through most of the difficulty here: https://hub.docker.com/r/hwdsl2/ipsec-vpn-server
The HA VM took about five minutes, all created by using this script: bash -c "$(wget -qLO - https://github.com/tteck/Proxmox/raw/main/vm/haos-vm.sh)"
Yes, adding certs with strongswan/ikev2 is a bit of a pain, but it IS fully documented at https://github.com/gitbls/pistrong/blob/master/CertInstall.md. The cert installs are a one-time thing, of course.