PPTP VPN 链接错误： GRE: Bad checksum from pppd

如题，我搜到的方法没有一个有用的……所以求助各位V大神了

配置：

option /etc/ppp/pptpd-options
name pptpd
refuse-pap
refuse-chap
refuse-mschap
require-mschap-v2
# Require MPPE 128-bit encryption
# (note that MPPE requires the use of MSCHAP-V2 during authentication)
require-mppe-128
# }}}
mppe-stateful
s-dns 8.8.8.8
ms-dns 8.8.4.4

# If pppd is acting as a server for Microsoft Windows or "Samba"
# clients, this option allows pppd to supply one or two WINS (Windows
# Internet Name Services) server addresses to the clients. The first
# instance of this option specifies the primary WINS address; the
# second instance (if given) specifies the secondary WINS address.
ms-wins 127.0.0.1
proxyarp

# Debian: do not replace the default route
nodefaultroute


# Logging

# Enable connection debugging facilities.
# (see your syslog configuration for where pppd sends to)
debug

# Print out all the option values which have been set.
# (often requested by mailing list to verify options)
#dump


# Miscellaneous

# Create a UUCP-style lock file for the pseudo-tty to ensure exclusive
# access.
lock

# Disable BSD-Compress compression
nobsdcomp
nopcomp
noaccomp

remoteip 192.168.0.100-200

syslog
Apr 20 16:21:09 HND-A pppd[25476]: pptpd-logwtmp: $Version$
Apr 20 16:21:09 HND-A pppd[25476]: pppd 2.4.5 started by meng, uid 0
Apr 20 16:21:09 HND-A pppd[25476]: using channel 28
Apr 20 16:21:09 HND-A pppd[25476]: Using interface ppp0
Apr 20 16:21:09 HND-A pppd[25476]: Connect: ppp0 <--> /dev/pts/5
Apr 20 16:21:09 HND-A pppd[25476]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap MS-v2> <magic 0x43b5e70c>]
Apr 20 16:21:09 HND-A pptpd[25475]: GRE: Bad checksum from pppd.
Apr 20 16:21:12 HND-A pppd[25476]: sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap MS-v2> <magic 0x43b5e70c>]