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strongSwan

the OpenSource IPsec-based VPN Solution

• runs on Linux 2.6 and 3.x kernels, Android, Maemo, FreeBSD, and Mac OS X
• implements both the IKEv1 and IKEv2 (RFC 5996) key exchange protocols
• Fully tested support of IPv6 IPsec tunnel and transport connections
• Dynamical IP address and interface update with IKEv2 MOBIKE (RFC 4555)
• Automatic insertion and deletion of IPsec-policy-based firewall rules
• NAT-Traversal via UDP encapsulation and port floating (RFC 3947)
• Dead Peer Detection (DPD, RFC 3706) takes care of dangling tunnels
• Static virtual IPs and IKEv1 ModeConfig pull and push modes
• XAUTH server and client functionality on top of IKEv1 Main Mode authentication
• Virtual IP address pool managed by IKE daemon or SQL database
• Secure IKEv2 EAP user authentication (EAP-SIM, EAP-AKA, EAP-TLS, EAP-MSCHAPv2, etc.)
• Optional relaying of EAP messages to AAA server via EAP-RADIUS plugin
• Support of IKEv2 Multiple Authentication Exchanges (RFC 4739)
• Authentication based on X.509 certificates or preshared keys
• Retrieval and local caching of Certificate Revocation Lists via HTTP or LDAP
• Full support of the Online Certificate Status Protocol (OCSP, RFC 2560).
• CA management (OCSP and CRL URIs, default LDAP server)
• Powerful IPsec policies based on wildcards or intermediate CAs
• Storage of RSA private keys and certificates on a smartcard (PKCS #11 interface)
• Modular plugins for crypto algorithms and relational database interfaces
• Support of elliptic curve DH groups and ECDSA certificates (Suite B, RFC 4869)
• Optional built-in integrity and crypto tests for plugins and libraries
• Smooth Linux desktop integration via the strongSwan NetworkManager applet
• Trusted Network Connect compliant to PB-TNC (RFC 5793) and PA-TNC (RFC 5792)

strongSwan VPN Client for Android 4.x

The free strongSwan App can be downloaded from Google Play. The VPN client currently supports IKEv2 only with EAP-MD5 or EAP-MSCHAPv2 password-based user authentication and certificate-based VPN gateway authentication.

strongSwan 5.x with Single Monolithic IKEv1/IKEv2 Daemon