Hi Alzhao,
Below is part of my syslog. Not sure if you can help with the configuration of the PPTP. Thanks in advance.
Mon Nov 21 11:31:26 2016 daemon.warn pppd[9132]: LCP: timeout sending Config-Requests
Mon Nov 21 11:31:26 2016 daemon.notice pppd[9132]: Connection terminated.
Mon Nov 21 11:31:26 2016 daemon.notice pppd[9132]: Modem hangup
Mon Nov 21 11:31:26 2016 daemon.info pppd[9132]: Exit.
Mon Nov 21 11:31:26 2016 daemon.notice netifd: Interface ‘PPTP’ is now down
Mon Nov 21 11:31:26 2016 daemon.notice netifd: Interface ‘PPTP’ is setting up now
Mon Nov 21 11:31:27 2016 daemon.info pppd[9191]: Plugin pptp.so loaded.
Mon Nov 21 11:31:27 2016 daemon.info pppd[9191]: PPTP plugin version 1.00
Mon Nov 21 11:31:27 2016 daemon.notice pppd[9191]: pppd 2.4.7 started by root, uid 0
Mon Nov 21 11:31:28 2016 daemon.info pppd[9191]: Using interface pptp-PPTP
Mon Nov 21 11:31:28 2016 daemon.notice pppd[9191]: Connect: pptp-PPTP <–> pptp (br1.pointtoserver.com)
Mon Nov 21 11:31:28 2016 kern.info kernel: [ 2313.470000] pptp-PPTP: renamed from ppp0
Mon Nov 21 11:31:34 2016 daemon.info dnsmasq-dhcp[2178]: DHCPINFORM(br-lan) 192.168.8.187 00:16:6f:0c:f9:af
Mon Nov 21 11:31:34 2016 daemon.info dnsmasq-dhcp[2178]: DHCPACK(br-lan) 192.168.8.187 00:16:6f:0c:f9:af T43
Mon Nov 21 11:31:36 2016 daemon.info dnsmasq-dhcp[2178]: DHCPINFORM(br-lan) 192.168.8.187 00:16:6f:0c:f9:af
Mon Nov 21 11:31:36 2016 daemon.info dnsmasq-dhcp[2178]: DHCPACK(br-lan) 192.168.8.187 00:16:6f:0c:f9:af T43
Mon Nov 21 11:31:58 2016 daemon.warn pppd[9191]: LCP: timeout sending Config-Requests
Mon Nov 21 11:31:58 2016 daemon.notice pppd[9191]: Connection terminated.
Mon Nov 21 11:31:58 2016 daemon.notice pppd[9191]: Modem hangup
Mon Nov 21 11:31:58 2016 daemon.info pppd[9191]: Exit.
Mon Nov 21 11:31:58 2016 daemon.notice netifd: Interface ‘PPTP’ is now down
Mon Nov 21 11:31:58 2016 daemon.notice netifd: Interface ‘PPTP’ is setting up now
Mon Nov 21 11:31:58 2016 daemon.info pppd[9413]: Plugin pptp.so loaded.
Mon Nov 21 11:31:58 2016 daemon.info pppd[9413]: PPTP plugin version 1.00
Mon Nov 21 11:31:58 2016 daemon.notice pppd[9413]: pppd 2.4.7 started by root, uid 0
Mon Nov 21 11:32:00 2016 daemon.info pppd[9413]: Using interface pptp-PPTP
Mon Nov 21 11:32:00 2016 kern.info kernel: [ 2345.140000] pptp-PPTP: renamed from ppp0
Mon Nov 21 11:32:00 2016 daemon.notice pppd[9413]: Connect: pptp-PPTP <–> pptp (br1.pointtoserver.com)