我已经在我的Raspberry Pi盒子上安装了pptpd（对于那些不知道的人来说，这是基于Debian的），它正在运行，但无法正常工作 – 我无法连接。
这里有趣的日志 – 我试图连接：
pi@raspberrypi ~ $ cat /var/log/syslog | grep pptpd | tail Aug 21 11:32:24 raspberrypi pptpd[1770]: CTRL: Reaping child PPP[1771] Aug 21 11:32:24 raspberrypi pptpd[1770]: CTRL: Client 77.253.47.194 control connection finished Aug 21 12:17:21 raspberrypi pptpd[1855]: MGR: PPP binary /usr/sbin/pppd not executable Aug 21 12:17:27 raspberrypi pptpd[1856]: CTRL: Client 77.253.47.194 control connection started Aug 21 12:17:27 raspberrypi pptpd[1856]: CTRL: Starting call (launching pppd, opening GRE) Aug 21 12:17:28 raspberrypi pptpd[1856]: CTRL: EOF or bad error reading ctrl packet length. Aug 21 12:17:28 raspberrypi pptpd[1856]: CTRL: couldn't read packet header (exit) Aug 21 12:17:28 raspberrypi pptpd[1856]: CTRL: CTRL read failed Aug 21 12:17:28 raspberrypi pptpd[1856]: CTRL: Reaping child PPP[1857] Aug 21 12:17:28 raspberrypi pptpd[1856]: CTRL: Client 77.253.47.194 control connection finished 和
pi@raspberrypi ~ $ cat /var/log/syslog | grep ppp | tail -n 25 Aug 21 11:32:24 raspberrypi pppd[1771]: but I couldn't find any suitable secret (password) for it to use to do so. Aug 21 11:32:24 raspberrypi pptpd[1770]: GRE: read(fd=6,buffer=15b84,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs Aug 21 12:17:21 raspberrypi pptpd[1855]: MGR: PPP binary /usr/sbin/pppd not executable Aug 21 12:17:27 raspberrypi pptpd[1856]: CTRL: Starting call (launching pppd, opening GRE) Aug 21 12:17:27 raspberrypi pppd[1857]: pppd 2.4.5 started by root, uid 0 Aug 21 12:17:27 raspberrypi pppd[1857]: Using interface ppp0 Aug 21 12:17:27 raspberrypi pppd[1857]: Connect: ppp0 <--> /dev/pts/1 Aug 21 12:17:27 raspberrypi pppd[1857]: peer from calling number 77.253.47.194 authorized Aug 21 12:17:27 raspberrypi pppd[1857]: kernel does not support PPP filtering Aug 21 12:17:28 raspberrypi ifplugd(ppp0)[1882]: ifplugd 0.28 initializing. Aug 21 12:17:28 raspberrypi ifplugd(ppp0)[1882]: Using interface ppp0/00:00:00:00:00:00 Aug 21 12:17:28 raspberrypi ifplugd(ppp0)[1882]: Using detection mode: IFF_RUNNING Aug 21 12:17:28 raspberrypi ifplugd(ppp0)[1882]: Initialization complete, link beat detected. Aug 21 12:17:28 raspberrypi pppd[1857]: MPPE 128-bit stateless compression enabled Aug 21 12:17:28 raspberrypi ifplugd(ppp0)[1882]: Executing '/etc/ifplugd/ifplugd.action ppp0 up'. Aug 21 12:17:28 raspberrypi ifplugd(ppp0)[1882]: client: Ignoring unknown interface ppp0=ppp0. Aug 21 12:17:28 raspberrypi ifplugd(ppp0)[1882]: Program executed successfully. Aug 21 12:17:28 raspberrypi pppd[1857]: LCP terminated by peer (MPPE disabled) Aug 21 12:17:28 raspberrypi pppd[1857]: Modem hangup Aug 21 12:17:28 raspberrypi pppd[1857]: Connection terminated. Aug 21 12:17:28 raspberrypi pppd[1857]: Connect time 0.1 minutes. Aug 21 12:17:28 raspberrypi pppd[1857]: Sent 3630 bytes, received 6720 bytes. Aug 21 12:17:28 raspberrypi pppd[1857]: Exit. Aug 21 12:17:28 raspberrypi ifplugd(ppp0)[1882]: Link beat lost. Aug 21 12:17:29 raspberrypi ifplugd(ppp0)[1882]: Exiting.
任何人都可以看到这些日志中的任何线索？ 我不太了解ppp和pptp。
当我尝试通过PPTP VPN连接到我的Raspberry Pi时，我自己也遇到了错误。 经过对“内核不支持PPP过滤”的错误进行search后， 这似乎是一个需要编译到内核中的选项 。 （见最近的post。）
要修复它，你需要使用一个不同的内核（或不同的发行版+内核），并将选项编译到内核中。 您也可以尝试自己编译内核，并启用该选项 （高级）。