pptpd服务器安装
1. rpm -qa|grep ppp 检查ppp版本，必须在2.4.1-3或以上，否则下载新版本，用rpm -Uvh更新；
2.下载pptpd-1.1.3-4.i386.rpm，rpm -ivh pptpd-1.1.3-4.i386.rpm安装；
3.编辑/etc/pptpd.conf：
speed 115200
localip 192.168.0.1 （本地ip，可以是1个或多个）
remoteip 192.168.0.2-128 （远程ip，最多可同时接入客户端数）
pidfile /var/run/pptpd.pid
4.编辑/etc/ppp/options：
lock
debug
name pptpd
auth
require chap
proxyarp
bsdcomp 0
5.编辑/etc/ppp/chap-secrets：
用户名 pptpd 密码 * （*号也可改为指定的ip）
6.在/etc/syslog.conf后追加一行：
daemon.debug /var/log/pptpd.log
7.重起syslog：
kill -SIGHUP `cat /var/run/syslogd.pid`
8.启动pptpd：
pptpd
9.debug信息可在 /var/log/pptpd.log中查看。
localip 192.168.6.1
remoteip
文件 /etc/ppp/options.pptpd
auth
debug
name fw
refuse-pap
refuse-chap
refuse-mschap
refuse-eap
require-mschap-v2
require-mppe-128
nomppe-stateful
#ms-dns 150.0.1.88
#ms-wins 150.0.1.88
proxyarp
文件/etc/ppp/chap-secrets 内容如下
# Secrets for authentication using CHAP
# client
main fw
xiaox fw
配置
编辑pptpd.conf配置文件
[root@linux ppp]# vi /etc/pptpd.conf
修改localip和remoteip的参数
[root@linux ppp]# cat /etc/pptpd.conf
###############################################################################
# $Id: pptpd.conf,v 1.8 2004/04/28 11:36:07 quozl Exp $
#
# Sample Poptop configuration file /etc/pptpd.conf
#
# Changes are effective when pptpd is restarted.
###############################################################################
# TAG: ppp
# Path to the pppd program, default '/usr/sbin/pppd' on Linux
#
#ppp /usr/sbin/pppd
# TAG: option
# Specifies the location of the PPP options file.
# By default PPP looks in '/etc/ppp/options'
#
option /etc/ppp/options.pptpd
# TAG: debug
# Turns on (more) debugging to syslog
#
#debug
# TAG: stimeout
# Specifies timeout (in seconds) on starting ctrl connection
#
# stimeout 10
# TAG: noipparam
# Suppress the passing of the client's IP address to PPP, which is
# done by default otherwise.
#
#noipparam
# TAG: logwtmp
# Use wtmp(5) to record client connections and disconnections.
#
logwtmp
# TAG: bcrelay <if>
# Turns on broadcast relay to clients from interface <if>
#
#bcrelay eth1
# TAG: localip
# TAG: remoteip
# Specifies the local and remote IP address ranges.
#
# Any addresses work as long as the local machine takes care of the
# routing. But if you want to use MS-Windows networking, you should
# use IP addresses out of the LAN address space and use the proxyarp
# option in the pppd options file, or run bcrelay.
#
# You can specify single IP addresses seperated by commas or you can
# specify ranges, or both. For example:
#
# 192.168.0.234,192.168.0.245-249,192.168.0.254
#
# IMPORTANT RESTRICTIONS:
#
# 1. No spaces are permitted between commas or within addresses.
#
# 2. If you give more IP addresses than MAX_CONNECTIONS, it will
# start at the beginning of the list and go until it gets
# MAX_CONNECTIONS IPs. Others will be ignored.
#
# 3. No shortcuts in ranges! ie. 234-8 does not mean 234 to 238,
# you must type 234-238 if you mean this.
#
# 4. If you give a single localIP, that's ok - all local IPs will
# be set to the given one. You MUST still give at least one remote
# IP for each simultaneous client.
#
# (Recommended)
localip 192.168.2.180
remoteip 192.168.2.181-185
# or
#localip 192.168.0.234-238,192.168.0.245
#remoteip 192.168.1.234-238,192.168.1.245
[root@linux ppp]#
编辑option.pptp配置文件
[root@linux ppp]# vi /etc/ppp/options.pptpd
如下
[root@linux ppp]# cat /etc/ppp/options.pptpd
###############################################################################
# $Id: options.pptpd,v 1.9 2005/08/02 11:33:32 quozl Exp $
#
# Sample Poptop PPP options file /etc/ppp/options.pptpd
# Options used by PPP when a connection arrives from a client.
# This file is pointed to by /etc/pptpd.conf option keyword.
# Changes are effective on the next connection. See "man pppd".
#
# You are expected to change this file to suit your system. As
# packaged, it requires PPP 2.4.2 and the kernel MPPE module.
###############################################################################
# Authentication
# Name of the local system for authentication purposes
# (must match the second field in /etc/ppp/chap-secrets entries)
name eccom
# Strip the domain prefix from the username before authentication.
# (applies if you use pppd with chapms-strip-domain patch)
#chapms-strip-domain
# Encryption
# (There have been multiple versions of PPP with encryption support,
# choose with of the following sections you will use.)
# BSD licensed ppp-2.4.2 upstream with MPPE only, kernel module ppp_mppe.o
# {{{
refuse-pap
refuse-chap
refuse-mschap
# Require the peer to authenticate itself using MS-CHAPv2 [Microsoft
# Challenge Handshake Authentication Protocol, Version 2] authentication.
require-mschap-v2
# Require MPPE 128-bit encryption
# (note that MPPE requires the use of MSCHAP-V2 during authentication)
require-mppe-128
# }}}
# OpenSSL licensed ppp-2.4.1 fork with MPPE only, kernel module mppe.o
# {{{
#-chap
#-chapms
# Require the peer to authenticate itself using MS-CHAPv2 [Microsoft
# Challenge Handshake Authentication Protocol, Version 2] authentication.
#+chapms-v2
# Require MPPE encryption
# (note that MPPE requires the use of MSCHAP-V2 during authentication)
#mppe-40 # enable either 40-bit or 128-bit, not both
#mppe-128
#mppe-stateless
# }}}
# Network and Routing
# If pppd is acting as a server for Microsoft Windows clients, this
# option allows pppd to supply one or two DNS (Domain Name Server)
# addresses to the clients. The first instance of this option
# 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
# 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 10.0.0.3
#ms-wins 10.0.0.4
# Add an entry to this system's ARP [Address Resolution Protocol]
# table with the IP address of the peer and the Ethernet address of this
# system. This will have the effect of making the peer appear to other
# systems to be on the local ethernet.
# (you do not need this if your PPTP server is responsible for routing
# packets to the clients -- James Cameron)
proxyarp
# 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
# Disable Van Jacobson compression
# (needed on some networks with Windows 9x/ME/XP clients, see posting to
# poptop-server on 14th April 2005 by Pawel Pokrywka and followups,
# http://marc.theaimsgroup.com/?t=111343175400006&r=1&w=2 )
novj
novjccomp
# turn off logging to stderr, since this may be redirected to pptpd
nologfd
[root@linux ppp]#
编辑chap.secrets配置文件
[root@linux ppp]# vi /etc/ppp/chap-secrets
如下：
[root@linux ppp]# cat /etc/ppp/chap-secrets
# Secrets for authentication using CHAP
# client server secret IP addresses
eccomuser1 eccom "eccomuser1" *
eccomuser2 eccom "eccomuser2" *
eccomuser3 eccom "eccomuser3" *
eccomuser4 eccom "eccomuser4" *
eccomuser5 eccom "eccomuser5" *
[root@linux ppp]#
启动服务
[root@linux ppp]# service pptpd start
Starting pptpd: [ OK ]
[root@linux ppp]#
查看tcp 1723端口是否开放
[root@linux ppp]# netstat -antup
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 2249/portmap
tcp 0 0 0.0.0.0:755 0.0.0.0:* LISTEN 2269/rpc.statd
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 19699/cupsd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2622/sendmail: acce
tcp 0 0 0.0.0.0:1723 0.0.0.0:* LISTEN 28184/pptpd
tcp 0 0 :::22 :::* LISTEN 2587/sshd
tcp 0 800 ::ffff:192.168.2.211:22 ::ffff:192.168.38.249:1373 ESTABLISHED 4439/1
tcp 0 0 ::ffff:192.168.2.211:22 ::ffff:192.168.38.249:2170 ESTABLISHED 27852/2
udp 0 0 0.0.0.0:749 0.0.0.0:* 2269/rpc.statd
udp 0 0 0.0.0.0:111 0.0.0.0:* 2249/portmap
udp 0 0 0.0.0.0:752 0.0.0.0:* 2269/rpc.statd
udp 0 0 0.0.0.0:631 0.0.0.0:* 19699/cupsd
[root@linux ppp]#
当使用pptp vpn登录，所有流量都走VPN通道，导致不能上网，修改windows 拨号客户端配置，
PPTP vpn -> 网络 -> tcp/ip -> 属性 -> 高级 -> 常规：去掉“在远程网络上使用默认网关”
注意事项：
/etc/ppp/options.pptpd 配置文件中的name 参数要和 /etc/ppp/chap-secrets 中的 server参数一样。
补充一点，如上配置，可以pptp方式拨入VPN，但是不能访问内网，在linux server上tcpdump抓包，发现返回icmp报文，type 3，code 10。
居然还需要linux配置允许转发：
echo "1" > /proc/sys/net/ipv4/ip_forward
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