求教 pptp 连上就断

Apr 21 11:38:37 master pppd[15552]: CHAP authentication succeeded
Apr 21 11:38:37 master pppd[15552]: MPPE 128-bit stateless compression enabled
Apr 21 11:38:37 master pppd[15552]: local  IP address 192.168.88.11
Apr 21 11:38:37 master pppd[15552]: remote IP address 192.168.88.1
Apr 21 11:38:37 master NetworkManager[9599]: <info>  [1682048317.2913] device (ppp0): state change: unmanaged -> unavailable (reason 'connection-assumed', sys-iface-state: 'external')
Apr 21 11:38:37 master NetworkManager[9599]: <info>  [1682048317.2932] device (ppp0): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'external')
Apr 21 11:38:37 master pptp[15563]: anon log[pptp_read_some:pptp_ctrl.c:559]: read returned zero, peer has closed
Apr 21 11:38:37 master pptp[15563]: anon log[callmgr_main:pptp_callmgr.c:266]: Closing connection (shutdown)
Apr 21 11:38:37 master pptp[15563]: anon log[ctrlp_rep:pptp_ctrl.c:254]: Sent control packet type is 12 'Call-Clear-Request'
Apr 21 11:38:37 master pptp[15563]: anon log[pptp_read_some:pptp_ctrl.c:559]: read returned zero, peer has closed
Apr 21 11:38:37 master pptp[15563]: anon log[call_callback:pptp_callmgr.c:81]: Closing connection (call state)
Apr 21 11:38:37 master pppd[15571]: Modem hangup
Apr 21 11:38:37 master pppd[15571]: Connect time 0.0 minutes.
Apr 21 11:38:37 master pppd[15571]: Sent 0 bytes, received 0 bytes.
Apr 21 11:38:37 master pppd[15571]: MPPE disabled
Apr 21 11:38:37 master pppd[15571]: Connection terminated.
Apr 21 11:38:37 master avahi-daemon[65995]: Withdrawing workstation service for ppp0.
Apr 21 11:38:37 master NetworkManager[9599]: <info>  [1682048317.3218] device (ppp0): state change: disconnected -> unmanaged (reason 'unmanaged', sys-iface-state: 'removed')