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FreeS/WAN is a free implementation of IPsec & IKE for Linux. Although IPsec will be added to the kernel as of 2.5, FreeS/WAN still maintains some benefits. The FreeS/WAN project came to an end on 2003/04/22. A few months before, most people active in the project forked the code in Openswan (

Opportunistic Encryption ( – enables you to set up IPsec tunnels without co-ordinating with another site administrator, and without hand configuring each tunnel. If enough sites support OE, a “FAX effect” occurs, and many of us can communicate without eavesdroppers.

  • A work-in-progress document ( regarding IKE/IPsec with Opportunistic Encryption.


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