vpn应用

- 虚拟专用网（VPN）被定义为通过一个公用网络（通常是因特网）建立一个临时的、安全的连接，是一条穿过混乱的公用网络的安全、稳定的隧道。虚拟专用网是对企业内部网的扩展。虚拟专用网可以帮助远程用户、公司分支机构、商业伙伴及供应商同公司的内部网建立可信的安全连接，并保证数据的安全传输。虚拟专用网可用于不断增长的移动用户的全球因特网接入，以实现安全连接；可用于实现企业网站之间安全通信的虚拟专用线路，用于经济有效地连接到商业伙伴和用户的安全外联网虚拟专用网。 Linux下的VPN配置 [root@oracle vpn]# ./InstallVPN.sh             #安装rpm软件包
tar vpn ..........
vpnpkg/
vpnpkg/ppp-2.4.3-5.rhel4.i386.rpm
vpnpkg/pptpd-1.3.3-1.rhel4.i386.rpm
vpnpkg/kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm
vpnpkg/dkms-2.0.10-1.noarch.rpm
tar config ..........
config/
config/chap-secrets
config/pptpd.conf
config/options.pptpd
Add Group vpn ..........
finish
Add User vpn ..........
finish
INSTALL ...................................................
./vpnpkg/dkms-2.0.10-1.noarch.rpm: not an rpm package (or package manifest):
Install dkms package finish!
warning: ./vpnpkg/kernel_ppp_mppe-1.0.2-3dkms.noarch.rpm: V3 DSA signature: NOKEY, key ID 862acc42
error: Failed dependencies:
        dkms >= 2.0.6 is needed by kernel_ppp_mppe-1.0.2-3dkms.noarch
Install kernel_ppp_mppe package finish!
warning: ./vpnpkg/ppp-2.4.3-5.rhel4.i386.rpm: V3 DSA signature: NOKEY, key ID b56a8bac
Preparing... #######################################[100%]
   1:ppp #######################################[100%]
Install ppp package finish!
warning: ./vpnpkg/pptpd-1.3.3-1.rhel4.i386.rpm: V3 DSA signature: NOKEY, key ID 862acc42
Preparing... #######################################[100%]
   1:pptpd #######################################[100%]
Install pptpd package finish!
..........................................................
....................Configure----VPN......................
....................Configure-pptpd...............finished
....................Configure-secret..............finished
....................Configure-option..............finished
Starting pptpd: [  OK  ]
......... Congratulate You For Install VPN .......   [root@oracle /]# vi etc/pptpd.conf             #配置vpn
localip 192.168.1.251                         #vpn-server ip
remoteip 172.16.0.50-100                 #vpn-client ip   [root@oracle /]# vi /etc/ppp/chap-secrets
# Secrets for authentication using CHAP
# client        server  secret                  IP addresses
####### redhat-config-network will overwrite this part!!! (begin) ##########
####### redhat-config-network will overwrite this part!!! (end) ############
#guest pptpd guest 192.168.199.151
test pptpd 000000 *      #username pptpd passwd *自动分配ip   [root@oracle /]# service pptpd restart
Shutting down pptpd: [  OK  ]