Private VPN with OpenVPN

Table of Contents

• OpenVPN Server Overview
  • What You’ll Achieve
  • How It Works
  • Setup Process
  • Client Configuration Script
  • Common Issue
  • What’s Next
• Install OpenVPN and Easy-RSA
  • Install and setup Easy-RSA
  • Creating a PKI for OpenVPN
  • Server Configuration
  • Setup server to forward IP packets to the Local Network
  • Client configuration
• Trouble Shooting OpenVPN
  • Determine and Fix Your VPN Tunnel’s Maximum MTU
  • IP MASQUERADE (NAT)
  • Stateful Inspection Explained
• OpenVPN Server Directives
  • option server
  • option dhcp-option DNS
  • option push route
  • option tun-mtu
  • dhcp-option DOMAIN
  • option redirect-gateway
• Comprehensive Analysis of iptables Rules
  • 1. Rule: Network Address Translation (NAT/Masquerade)
  • 2. Rule: TCP Maximum Segment Size (MSS) Clamping
  • 3. Rule: Stateful Inspection for Local Traffic (INPUT Chain)
  • 4. Rule: Stateful Inspection for Routed Traffic (FORWARD Chain)
  • 5. Rule: Specific Network-to-Network Forwarding