[Linux PPTP] Ubuntu PPTP Client Guild

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Jun 2, 2021

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• Install PPTP

sudo apt-get install pptpd pptp-linux  network-manager-pptp

• Setup PPTP Config

sudo pptpsetup --create myvpn --server [IPADDRESS] --username USERNAME

• Enter Password
• Start PPTP process

sudo pppd call myvpn

• Check PPTP log

sudo cat /var/log/syslogJun  2 09:09:46 MARS-even pppd[4360]: CHAP authentication succeeded
Jun  2 09:09:46 MARS-even pppd[4360]: LCP terminated by peer (MPPE required but cannot negotiate MPPE key length)
Jun  2 09:09:48 MARS-even pptp[4404]: anon log[pptp_read_some:pptp_ctrl.c:586]: read returned zero, peer has closed
Jun  2 09:09:48 MARS-even pptp[4404]: anon log[callmgr_main:pptp_callmgr.c:269]: Closing connection (shutdown)
Jun  2 09:09:48 MARS-even pptp[4404]: anon log[ctrlp_rep:pptp_ctrl.c:259]: Sent control packet type is 12 'Call-Clear-Request'
Jun  2 09:09:48 MARS-even pptp[4404]: anon log[pptp_read_some:pptp_ctrl.c:586]: read returned zero, peer has closed
Jun  2 09:09:48 MARS-even pptp[4404]: anon log[call_callback:pptp_callmgr.c:84]: Closing connection (call state)
Jun  2 09:09:48 MARS-even pppd[4360]: Modem hangup
Jun  2 09:09:48 MARS-even pppd[4360]: Connection terminated.
Jun  2 09:09:48 MARS-even pppd[4360]: Exit.

• Modify pptp config file to add MPPE

# written by pptpsetup
pty "pptp 210.63.221.150 --nolaunchpppd"
lock
noauth
nobsdcomp
nodeflate
name even_zhang
remotename myvpn
ipparam myvpnrequire-mppe-128

• Check Password

sudo vim /etc/ppp/chap-secrets

• Run again (sudo pppd call myvpn) and check log

Jun  2 09:14:17 MARS-even pppd[5008]: pppd 2.4.7 started by mars, uid 0
Jun  2 09:14:17 MARS-even pppd[5008]: Using interface ppp0
Jun  2 09:14:17 MARS-even pppd[5008]: Connect: ppp0 <--> /dev/pts/1
Jun  2 09:14:17 MARS-even pptp[5011]: anon log[main:pptp.c:350]: The synchronous pptp option is NOT activated
Jun  2 09:14:17 MARS-even pptp[5069]: anon log[ctrlp_rep:pptp_ctrl.c:259]: Sent control packet type is 1 'Start-Control-Connection-Request'
Jun  2 09:14:17 MARS-even pptp[5069]: anon log[ctrlp_disp:pptp_ctrl.c:781]: Received Start Control Connection Reply
Jun  2 09:14:17 MARS-even pptp[5069]: anon log[ctrlp_disp:pptp_ctrl.c:815]: Client connection established.
Jun  2 09:14:18 MARS-even pptp[5069]: anon log[ctrlp_rep:pptp_ctrl.c:259]: Sent control packet type is 7 'Outgoing-Call-Request'
Jun  2 09:14:18 MARS-even pptp[5069]: anon log[ctrlp_disp:pptp_ctrl.c:900]: Received Outgoing Call Reply.
Jun  2 09:14:18 MARS-even pptp[5069]: anon log[ctrlp_disp:pptp_ctrl.c:939]: Outgoing call established (call ID 56096, peer's call ID 3805).
Jun  2 09:14:18 MARS-even pppd[5008]: CHAP authentication succeeded
Jun  2 09:14:18 MARS-even pppd[5008]: MPPE 128-bit stateless compression enabled
Jun  2 09:14:18 MARS-even pppd[5008]: local  IP address 192.168.4.145
Jun  2 09:14:18 MARS-even pppd[5008]: remote IP address 192.168.3.1

• show interface to check PPTP has connected.

ppp0      Link encap:Point-to-Point Protocol
          inet addr:192.168.4.145  P-t-P:192.168.3.1  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1336  Metric:1
          RX packets:1864 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:148264 (148.2 KB)  TX bytes:66 (66.0 B)

• Disconnect PPTP from server

sudo killall pppd