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Overview -------- The ACCEL-PPTP is PPTP client plugin for PPP. ACCEL-PPTP uses kernel module to increase performance and decrease system usage. For more documentation about PPTP visit POPTOP web site. Requirment ---------- 1. Modern linux distribution 2. kernel-2.6.36 or later with PPTP support 3. pppd-2.4.2 or later 4. CMake 2.6 or later Compilation ----------- First at all, make sure that your kernel properly configured. You should have pptp.ko kernel module. Here some hints, how to enable support in kernel (tested on 2.6.39): [*] Networking support -> Networking options -> [*] TCP/IP networking -> <M> IP: GRE demultiplexer -> <M> IP: GRE tunnels over IP -> Device Drivers -> [*] Network device support -> <M> PPP (point-to-point protocol) support -> <M> PPP over IPv4 (PPTP) Don't forget load module pptp.ko when connecting: modprobe pptp Untar tarball: tar jxvf accel-pptp-<VER>.tar.bz2 Create build directory: mkdir accel-pptp_build cd accel-pptp_build Now you can compile plugin (PPP_PREFIX_DIR is where PPP prefix dir, usually this is /usr): cmake ../accel-pptp-<VER> -DPPP_PREFIX_DIR=/usr make Insallation ----------- Just make install from accel-pptp_build directory. Configuration ------------- If you are beginner in PPTP please read documentation available on POPTOP web site. Configuration is same as original pptpd and pptp. Exception in configuration of client is: replace line in peer config file (for instance, /etc/ppp/peers/my_vpn): pty "pptp x.x.x.x ...." to plugin "/usr/lib/pptp.so" (path may differ) pptp_server x.x.x.x (required) pptp_phone xxxx (optional) pptp_window xxx (optional) - this is sliding window size (at current time automatic algorithm is not implemented), set it to 3-10 for low-speed connections, to >10 for hi-speed connections. Remove lock option in /etc/ppp/options.pptp, /etc/ppp/options.pptpd or similar if it exists. See configuration example in example directory. Warning !!! ----------- 1. This driver conflicts with ip_gre driver (in kernel), so make sure that ip_gre is not built-in or loaded at run time. 2. Never mix connections of accel-pptp and original pptpd, before starting accel-pptp make sure that no connections of original pptpd exists. 3. If you are upgrading pppd, don't forget recompile and reinstall pptp plugin too. Thanks ------ Author of original accel-pptp code Dmitry Kozlov <email@example.com> Thanks to Kirill Yushkov for debug support and donations. https://github.com/winterheart/accel-pptp/