DD-WRT 拨 PPTP 不能成功

服务器端配置： Centos 6.7 pptpd v1.4.0 电脑上能拨号成功
服务器端日志信息
Mar 26 17:35:53 Tencent pptpd[4842]: CTRL: Client 123.123.123.123 control connection started
Mar 26 17:35:54 Tencent pptpd[4842]: CTRL: Starting call (launching pppd, opening GRE)
Mar 26 17:35:54 Tencent pppd[4849]: Plugin /usr/lib64/pptpd/pptpd-logwtmp.so loaded.
Mar 26 17:35:54 Tencent pppd[4849]: pptpd-logwtmp: $Version$
Mar 26 17:35:54 Tencent pppd[4849]: pppd 2.4.5 started by root, uid 0
Mar 26 17:35:54 Tencent pppd[4849]: Using interface ppp0
Mar 26 17:35:54 Tencent pppd[4849]: Connect: ppp0 <--> /dev/pts/0
Mar 26 17:35:56 Tencent pppd[4849]: Modem hangup
Mar 26 17:35:56 Tencent pppd[4849]: Connection terminated.
Mar 26 17:35:56 Tencent pppd[4849]: Exit.
Mar 26 17:35:56 Tencent pptpd[4842]: CTRL: Client 123.123.123.123 control connection finished
Mar 26 17:36:00 Tencent pptpd[4881]: CTRL: Client 123.123.123.123 control connection started
Mar 26 17:36:01 Tencent pptpd[4881]: CTRL: Starting call (launching pppd, opening GRE)
Mar 26 17:36:01 Tencent pppd[4882]: Plugin /usr/lib64/pptpd/pptpd-logwtmp.so loaded.
Mar 26 17:36:01 Tencent pppd[4882]: pptpd-logwtmp: $Version$
Mar 26 17:36:01 Tencent pppd[4882]: pppd 2.4.5 started by root, uid 0
Mar 26 17:36:01 Tencent pppd[4882]: Using interface ppp0
Mar 26 17:36:01 Tencent pppd[4882]: Connect: ppp0 <--> /dev/pts/0
Mar 26 17:36:03 Tencent pppd[4882]: Modem hangup
Mar 26 17:36:03 Tencent pppd[4882]: Connection terminated.
Mar 26 17:36:03 Tencent pppd[4882]: Exit.

服务器配置文件 /etc/ppp/options.pptpd
name pptpd
refuse-pap
refuse-chap
refuse-mschap
require-mschap-v2
require-mppe-128
proxyarp
debug
lock
nobsdcomp
novj
novjccomp
nologfd
ms-dns 8.8.8.8
ms-dns 8.8.4.4

DD-WRT 配置
http://7bv9s3.com5.z0.glb.clouddn.com/20160326174437.png
MPPE Encryption mppe required,no40,no56,stateless