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如果你的硬件支持 Cryptographic Hardware Acceleration，你需要确保它被你的OpenWrt版本支持，并且被使能了.
strongSwan is a recommended IPsec implementation, though some of this documentation may be relevant for other configurations.
You may setup OpenWrt as an OpenConnect VPN client or server. This is a protocol based on SSL/TLS and datagram TLS and is compatible with CISCO's AnyConnect SSL VPN.
Not secure! PPTP is broken since 1997. See poptop security message.
vpnccompatible with Cisco's EasyVPN equipment