在CENTOS7 minial环境下,配置pptpd-1.4.0                                                                                                         
编辑 pptpd.conf                                                                                                                                 
#vi /etc/pptpd.conf                                                                                                                             
    option /etc/ppp/options.pptpd                                                                                                                 
    localip 192.168.111.254 #本地地址#                                                                                                            
    remoteip 192.168.111.251-253 #客户端拨入进来使用的地址#                                                                                       
编辑 options.pptpd                                                                                                                             
#vi /etc/ppp/options.pptpd                                                                                                                      
    name pptpd                                                                                                                                    
    refuse-pap                                                                                                                                    
    refuse-chap                                                                                                                                   
    refuse-mschap                                                                                                                                 
    require-mschap-v2                                                                                                                             
    require-mppe-128                                                                                                                              
    ms-dns 223.6.6.6   #阿里的DNS#                                                                                                                  
    proxyarp                                                                                                                                      
    lock                                                                                                                                          
    nobsdcomp                                                                                                                                     
    novj                                                                                                                                          
    novjccomp                                                                                                                                     
    nologfd                                                                                                                                       
                                                                                                                                                  
编辑 chap-secrets                                                                                                                               
#vi /etc/ppp/chap-secrets                                                                                                                       
                                                                                                                                                
    # Secrets for authentication using CHAP                                                                                                       
    # client        server  secret                  IP addresses                                                                                  
    vpnuser         pptpd   vpnuserpassword        *

安装过程

#yum install wget

#wget ftp://rpmfind.net/linux/epel/6/x86_64/pptpd-1.4.0-3.el6.x86_64.rpm

# yum install perl

#rpm -ivh pptpd-1.4.0-3.el6.x86_64.rpm

#/usr/local/sbin/pptpd #直接运行                                                                                                                
#netstat -ltan                                                                                                                                  
tcp        0      0 0.0.0.0:1723            0.0.0.0:*               LISTEN                                                                      
                                                                                                                                                
使用VPN后,如果出现网速极慢,很可能是MTU(IP)和MSS(TCP)之间配合的问题,                                                                       
# netstat -i                                                                                                                                    
Kernel Interface table                                                                                                                          
Iface      MTU    RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg                                                                  
enp3s0    1500  1729118      0      0 0       1277642      0      0      0 BMRU                                                                 
enp6s0    1500  3774726      2      1 0       3166464      0      0      0 BMRU                                                                 
lo       65536     2077      0      0 0          2077      0      0      0 LRU                                                                  
ppp0      1500  3707635      0      0 0       3108539      0      0      0 MOPRU                                                                
可以看出以太网的最大MTU是1500,需要在iptables中加入规则,                                                                                       
sbin/iptables -A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss 1356:1536 -j TCPMSS --clamp-mss-to-pmt                           
在客户端中可通过

ping -f -l mtu-size 8.8.8.8  进行测试(mtu-size为MTU大小,可以从1500开始,逐渐减小,直到ping通为止)

与pptpd相关防火墙其它配置

/sbin/iptables -A INPUT -p gre -j ACCEPT
/sbin/iptables -A INPUT -p tcp -m state --state NEW -m tcp --dport 1723 -j ACCEPT
/sbin/iptables -A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -m tcpmss --mss 1356:1536 -j TCPMSS --clamp-mss-to-pmt

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