我尝试在ubuntu主机上设置VPN连接。这是我的步骤。连接终止后，我必须完成两个步骤。知道为什么连接不稳定吗？我在AWS EC2实例上完成了这项工作。非常感谢！
sudo -s
apt-get install pptp-linux
pptpsetup --create alauda_build --server 52.68.x.x --username vpn_tester --password <password> --encrypt
pon vpn_test debug dump 2 logfd nodetach
route add default dev ppp0
输出：
pppd options in effect:
debug # (from command line)
nodetach # (from command line)
persist # (from /etc/ppp/peers/vpn_test)
logfd 2 # (from command line)
dump # (from command line)
noauth # (from /etc/ppp/peers/vpn_test)
name vpn_tester # (from /etc/ppp/peers/vpn_test)
remotename vpn_test # (from /etc/ppp/peers/vpn_test)
# (from /etc/ppp/peers/vpn_test)
pty pptp x.x.x.x --nolaunchpppd # (from /etc/ppp/peers/vpn_test), hide the password
crtscts # (from /etc/ppp/options)
# (from /etc/ppp/options)
asyncmap 0 # (from /etc/ppp/options)
lcp-echo-failure 4 # (from /etc/ppp/options)
lcp-echo-interval 30 # (from /etc/ppp/options)
hide-password # (from /etc/ppp/options)
ipparam vpn_test # (from /etc/ppp/peers/vpn_test)
nobsdcomp # (from /etc/ppp/peers/vpn_test)
nodeflate # (from /etc/ppp/peers/vpn_test)
require-mppe-128 # (from /etc/ppp/peers/vpn_test)
noipx # (from /etc/ppp/options)
using channel 34
Using interface ppp0
Connect: ppp0 <--> /dev/pts/4
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x63662628> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap MS-v2> <magic 0xfb01ac1> <pcomp> <accomp>]
sent [LCP ConfAck id=0x1 <asyncmap 0x0> <auth chap MS-v2> <magic 0xfb01ac1> <pcomp> <accomp>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x63662628> <pcomp> <accomp>]
sent [LCP EchoReq id=0x0 magic=0x63662628]
rcvd [LCP EchoReq id=0x0 magic=0xfb01ac1]
sent [LCP EchoRep id=0x0 magic=0x63662628]
rcvd [CHAP Challenge id=0x36 <6937cf224af1afe0a65568ddc9f186ae>, name = "pptpd"]
sent [CHAP Response id=0x36 <3d8e45c218d89529219e105db021e2fd0000000000000000f274aef515020c066234c7220443bcb6b02173d361f642f500>, name = "vpn_tester"]
rcvd [LCP EchoRep id=0x0 magic=0xfb01ac1]
rcvd [CHAP Success id=0x36 "S=9B5067A80B921CC0454FCFB594344C1472D6067D M=Access granted"]
CHAP authentication succeeded
sent [CCP ConfReq id=0x1 <mppe +H -M +S -L -D -C>]
rcvd [CCP ConfReq id=0x1 <mppe +H -M +S -L -D -C>]
sent [CCP ConfAck id=0x1 <mppe +H -M +S -L -D -C>]
rcvd [CCP ConfAck id=0x1 <mppe +H -M +S -L -D -C>]
MPPE 128-bit stateless compression enabled
sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 172.31.x.x>]
rcvd [IPCP ConfReq id=0x1 <addr 192.168.240.1>]
sent [IPCP ConfAck id=0x1 <addr 192.168.240.1>]
rcvd [IPCP ConfRej id=0x1 <compress VJ 0f 01>]
sent [IPCP ConfReq id=0x2 <addr 172.31.x.x>]
rcvd [IPCP ConfNak id=0x2 <addr 192.168.240.17>]
sent [IPCP ConfReq id=0x3 <addr 192.168.240.17>]
rcvd [IPCP ConfAck id=0x3 <addr 192.168.240.17>]
local IP address 192.168.240.17
remote IP address 192.168.240.1
Script /etc/ppp/ip-up started (pid 5333)
Script /etc/ppp/ip-up finished (pid 5333), status = 0x0
Script pptp 52.68.x.x --nolaunchpppd finished (pid 5317), status = 0x0
Modem hangup
Connect time 5.6 minutes.
Sent 252 bytes, received 252 bytes.
Script /etc/ppp/ip-down started (pid 5399)
MPPE disabled
sent [LCP TermReq id=0x2 "MPPE disabled"]
Connection terminated.
答案 0 :(得分：0)
需要将VPN服务器配置中设置的MTU更改为1356