MAC连接pptp服务经常断线
日志内容如下
Aug 1 14:01:06 s1 pptpd[21666]: CTRL: Client 218.88.x.155 control connection finished
Aug 1 14:05:34 s1 pptpd[21965]: CTRL: Client 218.88.x.155 control connection started
Aug 1 14:05:34 s1 pptpd[21965]: CTRL: Starting call (launching pppd, opening GRE)
Aug 1 14:05:34 s1 pppd[21967]: Warning: can't open options file /home/xxxx/.ppprc: Permission denied
Aug 1 14:05:34 s1 pppd[21967]: Plugin /usr/lib64/pptpd/pptpd-logwtmp.so loaded.
Aug 1 14:05:34 s1 pppd[21967]: pptpd-logwtmp: $Version$
Aug 1 14:05:34 s1 pppd[21967]: Using interface ppp0
Aug 1 14:05:34 s1 pppd[21967]: Connect: ppp0 <--> /dev/pts/2
Aug 1 14:05:34 s1 pptpd[21965]: GRE: Bad checksum from pppd.
Aug 1 14:05:38 s1 pppd[21967]: MPPE 128-bit stateless compression enabled
Aug 1 14:05:41 s1 pppd[21967]: Unsupported protocol 'Apple Client Server Protocol Control' (0x8235) received
Aug 1 14:05:41 s1 pppd[21967]: Unsupported protocol 'IPv6 Control Protocol' (0x8057) received
Aug 1 14:05:41 s1 pppd[21967]: Unsupported protocol 'Apple Client Server Protocol Control' (0x8235) received
Aug 1 14:05:41 s1 pppd[21967]: Cannot determine ethernet address for proxy ARP
Aug 1 14:05:41 s1 pppd[21967]: local IP address 192.168.x.1
Aug 1 14:05:41 s1 pppd[21967]: remote IP address 192.168.x.10
Aug 1 14:05:41 s1 pppd[21967]: pptpd-logwtmp.so ip-up ppp0 xxxxx 218.88.20.155
Aug 1 14:05:43 s1 pptpd[21965]: GRE: read(fd=7,buffer=6097c0,len=8260) from network failed: status = -1 error = Message too long
Aug 1 14:05:43 s1 pptpd[21965]: CTRL: GRE read or PTY write failed (gre,pty)=(7,6)
Aug 1 14:05:43 s1 pppd[21967]: Modem hangup
Aug 1 14:05:43 s1 pppd[21967]: pptpd-logwtmp.so ip-down ppp0
Aug 1 14:05:43 s1 pppd[21967]: Connect time 0.1 minutes.
Aug 1 14:05:43 s1 pppd[21967]: Sent 9063 bytes, received 3553 bytes.
Aug 1 14:05:43 s1 pppd[21967]: MPPE disabled
Aug 1 14:05:43 s1 pppd[21967]: Connection terminated.
Aug 1 14:05:43 s1 pppd[21967]: Exit.
Aug 1 14:05:43 s1 pptpd[21965]: CTRL: Client 218.88.20.155 control connection finished
主要错误是这句
GRE: read(fd=7,buffer=6097c0,len=8260) from network failed: status = -1
GRE 通用路由封装（英语：Generic Routing Encapsulation，缩写为GRE），一种隧道协议，可以在虚拟点对点链路中封装多种网络层协议。由思科系统开发，在RFC 2784中定义。Wiki
MTU最大传输单元（英语：Maximum Transmission Unit，缩写MTU）是指一种通信协议的某一层上面所能通过的最大数据包大小（以字节为单位）wiki
如果超出MTU设置的值数据包可能会被分段传输.然后又可能会造成这个错误.
尝试调整MTU设置 . 因为Windows的默认值是 1472 .因此将MAC的设置成1472.目前连接比较稳定.
MAC MTU设置
连接L2TP协议的vpn， 填好信息报错“IPSec 共享密钥”丢失
在 /etc/ppp 目录下创建一个 options目录
内容如下
plugin L2TP.ppp
l2tpnoipsec
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