pptp 内网无法联机

[ech0x]

Jan 30 23:02:33 iZ94px3jbfiZ pppd[1420]: peer from calling number 125.121.121.96 authorized
Jan 30 23:02:33 iZ94px3jbfiZ pppd[1420]: MPPE 128-bit stateless compression enabled
Jan 30 23:02:33 iZ94px3jbfiZ pppd[1420]: Cannot determine ethernet address for proxy ARP
Jan 30 23:02:33 iZ94px3jbfiZ pppd[1420]: local IP address 192.168.0.150
Jan 30 23:02:33 iZ94px3jbfiZ pppd[1420]: remote IP address 192.168.0.153
Jan 30 23:02:36 iZ94px3jbfiZ pppd[1272]: LCP terminated by peer (MPPE disabled)
Jan 30 23:02:36 iZ94px3jbfiZ pppd[1272]: Connect time 4.8 minutes.
Jan 30 23:02:36 iZ94px3jbfiZ pppd[1272]: Sent 324983 bytes, received 142008 bytes.
Jan 30 23:02:36 iZ94px3jbfiZ pptpd[1271]: CTRL: EOF or bad error reading ctrl packet length.
Jan 30 23:02:36 iZ94px3jbfiZ pptpd[1271]: CTRL: couldn't read packet header (exit)
Jan 30 23:02:36 iZ94px3jbfiZ pptpd[1271]: CTRL: CTRL read failed
Jan 30 23:02:36 iZ94px3jbfiZ pppd[1272]: Modem hangup
Jan 30 23:02:36 iZ94px3jbfiZ pppd[1272]: Connection terminated.
Jan 30 23:02:36 iZ94px3jbfiZ pppd[1272]: Exit.
Jan 30 23:02:36 iZ94px3jbfiZ pptpd[1271]: CTRL: Client 115.196.8.181 control connection finished
Jan 30 23:02:42 iZ94px3jbfiZ systemd-logind: Removed session 1.
Jan 30 23:02:44 iZ94px3jbfiZ systemd: Starting Session 5 of user root.
Jan 30 23:02:44 iZ94px3jbfiZ systemd: Started Session 5 of user root.
Jan 30 23:02:44 iZ94px3jbfiZ systemd-logind: New session 5 of user root.
今天下午都还可以联机的，后来断开 vpn 一段时间后就无法联机了，不知道为什么。