• Openswan - Home Page
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• strongSwan
  IPsec for Linux
  strongSwan is an Open Source IPsec-based VPN solution for Linux and other UNIX based operating systems implementing both the IKEv1 and IKEv2 key exchange protocols.
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  in Linux with ipsec linux
• Using a Linux L2TP/IPsec VPN server
  
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  in Linux with ipsec l2tp linux server vpn

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