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mahone3297 我的是centos 6.3 64位
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ryd994 我贴一键关键位置，就不贴整个了
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/etc/ppp/options.pptpd===============
# specifies the primary DNS address; the second instance (if given)
# specifies the secondary DNS address.
#ms-dns 10.0.0.1
#ms-dns 10.0.0.2
ms-dns 8.8.8.8
ms-dns 8.8.4.4
====================
# cat /etc/ppp/chap-secrets=============
# Secrets for authentication using CHAP
# client server secret IP addresses
ob pptpd 123456 *
guest pptpd 123456 *
======================
# cat /etc/pptpd.conf==============
# (Recommended)
#localip 192.168.0.1
#remoteip 192.168.0.234-238,192.168.0.245
localip 192.168.0.1
remoteip 192.168.0.234-238
# or
#localip 192.168.0.234-238,192.168.0.245
#remoteip 192.168.1.234-238,192.168.1.245
上面localip和remoteip改过好几种形式，现在是这种
============================
#cat /etc/sysctl.conf===========
# Controls IP packet forwarding
net.ipv4.ip_forward = 1
# Controls source route verification
net.ipv4.conf.all.rp_filter=0
net.ipv4.conf.default.rp_filter=0
# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0
# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0
# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1
# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1
===================================
# cat /etc/sysconfig/iptables==============下面是iptables完整的了，可能问题出在这里：帮忙看下：
# Generated by iptables-save v1.4.7 on Tue Dec 16 10:28:53 2014
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [5:1174]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 21 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 1723 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 47 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 3306 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 8080 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 30000:30100 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
COMMIT
# Completed on Tue Dec 16 10:28:53 2014
# Generated by iptables-save v1.4.7 on Tue Dec 16 10:28:53 2014
*nat
:PREROUTING ACCEPT [176:13030]
:POSTROUTING ACCEPT [41:3203]
:OUTPUT ACCEPT [41:3203]
-A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 8080
-A POSTROUTING -s 192.168.0.0/24 -o eth1 -j MASQUERADE
COMMIT
# Completed on Tue Dec 16 10:28:53 2014
===============================
其他重启服务，设置生效的都弄过，就差重启服务器了。。实在找不出问题