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IPsec site-to-site tunnel

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IPsec tunneling theory

IPsec is very powerful, but also quite complicated and intricate. When starting on tunneling, you might want to start exploring the site ipsec-howto. It explains both the theory of IPsec, and describes how to create IPsec tunnels. However, after reviewing the theory, you might want to continue here for a more elaborate, Debian-specific, site-to-site only, howto on tunneling.

IPsec site-to-site tunneling

Starting point: two sites

IPsec preparations

IPsec installation

IPsec site-to-site tunnel configuration

Method 1: using racoon-tool

Method 2: direct racoon configuration

Extra configuration issues

setting the right routes

adapting your firewall configuration

DNS and WINS issues

IPsec diagnostics

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