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Linux VPN Masquerade HOWTO

John D. Hardin <>

v2.2, 9 September 1999

This document describes how to configure a Linux firewall to masquerade IPsec- and PPTP-based Virtual Private Network traffic, allowing you to establish a VPN connection without losing the security and flexibility of your Linux firewall's internet connection and allowing you to make available a VPN server that does not have a registered internet IP address. Information on configuring the VPN client and server is also given.

1. Introduction

2. Background Knowledge

3. Configuring the Linux firewall

4. Configuring the VPN client

5. Troubleshooting

6. IPsec masquerade technical notes and special security considerations

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