????VPN?????????????VirtualPrivateNetwork????????????????????н??????????????磬?????????????“???????”????????紫???????????????VPN????????????????????????????·????????????й????????????????????Ч?????????????????????VPN?????????????綏?????Ч???????????????????????????????????????????????????????????????????????????????????????????VPN??????????????缼???е?????????VPN??????????????????????????????????????????????VPN?????????????????????????????????????顢???ERP/????????????????????????????????????VPN????÷???????????????????????????????????????á?
??????????????????VPN????????????y?????????Linux?????????????????Э??PPTP??VPN?????????
????????PPTPЭ???VPN???????????
?????????????????Linux?????????а??????????Ч??????????????????????????????????????潫????Linux?????????????????RedHat?????Linux???а棩?????PPTPЭ?????????VPN???????????????
?????????????“Poptop-ThePPTPServerforLinux”???Linux?μ?VPN???????????????Poptop???????????????????????PPTP???????Э?????????Windows95/98/Me/NT/2000/XP??Linux??PPTP??????Poptop?????????????Э??(MSCHAPv2??MPPE40-128bitRC4????)??????????????RADIUS?????????????????繃??(LDAP??SAMBA)????????????
????pptpd??Poptop??????????????Poptop??PPTP???????????????????е????PPTP???Э???VPN???????pptpd??????????VPN?????????????????pppd??????????????????????????VPN????????????Poptop?????????????PPP???????????潫???????Poptop?????????ú???á?
????1??PPP?????????
????????Linux???а汾?????PPP?????????????????Poptop??????www.poptop.org???·?????PPP?????????Linux???а??????PPP????????ppp-2.4.3-5.rhl9.i386.rpm?????????“rpm-Uvhppp-2.4.3-5.rhl9.i386.rpm”????????????PPP?????????????
????2??Poptop??????????
??????Poptop????????????????μ?????汾?????????1.3.0????????pptpd-1.3.0-0.i386.rpm????汾???PPP?汾????2.4.3???????????“rpm-ivhpptpd-1.3.0-0.i386.rpm”????????????
????3??????Poptop??????
????Poptop?????????????????/etc/pptpd.conf????????????￡?
????debug
????ppp/usr/sbin/pppd
????option/etc/ppp/options.pptpd
????localip192.168.0.1
????remoteip192.168.0.128-254
????????????У?debug?????????????????????????????????syslogd????ppp??????????pppd????????λ?á?option??????pptpd??????????????????λ?á?localip???????VPN?????VPN????????????IP?????remoteip???????VPN????????????IP???????????????IP?????д????????д???IP???????????????????IP?????Χ??????“192.168.0.234??192.168.0.245-249??192.168.0.254”???????????????????localip??VPN??????????????VPN?????????????????????IP?????????VPN??????????????localip??????IP???????VPN??????????????VPN??????????????????????IP?????????VPN??????????????localip????IP?????Χ??VPN??????????????VPN??????????????????????IP?????????VPN????????????????????μ?VPN????????????
????4???й?PPP??????
??????PPP?????????/etc/ppp/options.pptpd????poptop?????????option?????????????????
????debugnamepptpdauthrequire-chapproxyarp
????????????У?name????????????????????auth??????????????/etc/ppp/chap-secrets???????????????require-chap???????chap?????proxyarp???????arp????????
????????????chap?????????/etc/ppp/chap-secrets????????????
????testpptpd123*
????????test??ppp????pptpd????/etc/ppp/options.pptpd????????????????123??test????????“*”???????test?????κ?????????PPP???????????????????????VPN?????
????5????Poptop??????????????????
??????syslogd?????????/etc/syslog.conf?????????????????
????daemon.debug/var/log/pptpd.log
??????????????syslogd????????????VPN?????????????????????????/var/log/pptpd.log????С?
????6?????Poptop??????
?????????????????Poptop????
????servicepptpdstart
??????
????/etc/rc.d/init.d/pptpdstart
?????????VPN????????????????VPN?????????????????????????/var/log/pptpd.log
????Windows???????????VPN??????
????Poptop???Windows??Unix????????????????VPN????????????WindowsXP???????????????VPN????????????Windows??????PPTPЭ???????????????????в??????VPN??????????????????????
????1??????VPN????
???????????????????????????VPN?????“????????????”???“?????????????????????(O)”??“????????”???“????????????????V??”??“??????”????????????????????????“VPN?????????”????VPN???????????IP?????????“???”???????VPN?????
????2?????????VPN??????
??????????????VPN?????????????“????”???????????????VPN????????????????????????
???????“????”??“???”????μ?“?????????????м?????????I??”?????
????3???????????VPN????
??????VPN???????????????
??????VPN???????????ifconfig?????????????
?????VPN??????????MPPE????