Update the README

[aaahrens]

The vpn doesn't work unless you have esp enabled on all ports.

[aaahrens]

running on macOS, latest version of mojave with the latest ami, with the following terraform security group

resource "aws_security_group" "vpn" {
  name        = "${var.cluster-name}-vpn"
  description = "Security group for vpn of the cluster"
  vpc_id      = aws_vpc.vpc.id
  egress {
    from_port = 0
    to_port   = 0
    protocol  = "-1"
    cidr_blocks = [
    "0.0.0.0/0"]
  }
  ingress {
    from_port = 500
    protocol  = "udp"
    to_port   = 500
    cidr_blocks = [
    "0.0.0.0/0"]
  }
  ingress {
    from_port = 22
    protocol  = "tcp"
    to_port   = 22
    cidr_blocks = [
    "0.0.0.0/0"]

  }
  ingress {
    from_port = 4500
    protocol  = "udp"
    to_port   = 4500
    cidr_blocks = [
    "0.0.0.0/0"]
  }
  ingress {
    from_port = 1701
    protocol  = "udp"
    to_port   = 1701
    cidr_blocks = [
    "0.0.0.0/0"]
  }
}

will always fail authentication, adding:

  ingress {
    from_port = 0
    protocol  = "50"
    to_port   = 0
    cidr_blocks = [
    "0.0.0.0/0"]
  }

using the exact same credentials, will succeed in authentication

[ttheune]

Was never able to reproduce.