PPTP服务器陷入"GRE: pppd的坏校验和“

Question

我是一个网络工程师，在Ubuntu方面的经验非常有限。我一直在跟踪这些在线说明用于设置pptp服务器，但没有多少运气让它开始工作。我的服务器是运行在Cisco防火墙后面的Apple的vm。我确保打开了tcp 1723和GRE。下面是syslog输出，看起来我总是卡在GRE: Bad checksum from pppd上。我在运行Ubuntu10.04。

Sep 24 13:21:53 ubuntu pptpd[1231]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
Sep 24 13:21:53 ubuntu pptpd[1231]: CTRL: Reaping child PPP[1232]
Sep 24 13:21:53 ubuntu pptpd[1231]: CTRL: Client 166.137.85.165 control connection finished
Sep 24 13:22:41 ubuntu pptpd[1276]: MGR: connections limit (100) reached, extra IP addresses ignored
Sep 24 13:22:41 ubuntu pptpd[1277]: MGR: Manager process started
Sep 24 13:22:41 ubuntu pptpd[1277]: MGR: Maximum of 100 connections available
Sep 24 13:22:50 ubuntu pptpd[1278]: CTRL: Client 166.137.85.165 control connection started
Sep 24 13:22:51 ubuntu pptpd[1278]: CTRL: Starting call (launching pppd, opening GRE)
Sep 24 13:22:51 ubuntu pppd[1279]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded.
Sep 24 13:22:51 ubuntu pppd[1279]: pppd 2.4.5 started by root, uid 0
Sep 24 13:22:51 ubuntu pppd[1279]: Using interface ppp0
Sep 24 13:22:51 ubuntu pppd[1279]: Connect: ppp0 <--> /dev/pts/1
Sep 24 13:22:51 ubuntu pptpd[1278]: GRE: Bad checksum from pppd.
Sep 24 13:23:21 ubuntu pppd[1279]: LCP: timeout sending Config-Requests
Sep 24 13:23:21 ubuntu pppd[1279]: Connection terminated.
Sep 24 13:23:21 ubuntu pppd[1279]: Modem hangup
Sep 24 13:23:21 ubuntu pppd[1279]: Exit.
Sep 24 13:23:21 ubuntu pptpd[1278]: GRE: read(fd=6,buffer=805a540,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs
Sep 24 13:23:21 ubuntu pptpd[1278]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7)
Sep 24 13:23:21 ubuntu pptpd[1278]: CTRL: Reaping child PPP[1279]
Sep 24 13:23:21 ubuntu pptpd[1278]: CTRL: Client 166.137.85.165 control connection finished

Answer 1

就我个人而言，我对此并不熟悉。但我喜欢尽我所能去帮忙。

有些用户遇到了和自己一样的问题，并且已经解决了这个问题。下面是可能修复的相关ubuntuforums文章：Ubuntu论坛

Answer 2

试着打开网页。是不是比平时要花更长时间？您可能会收到无效的答案，因为互联网连接缓慢。如果是这样的话，试着找一个更好的连接。插入以太网，如果你还没有。