vpn

前言 为什么在ping不通Google的时候，我们却可以web直接访问Google (已开启SSR 翻 墙 ) SSR访问Google 因为GFW的限制导致国内无法直接访问谷歌，那么SSR为什么能绕过限制可以直接访问Google呢？ 首先我们要先了解一下SSR的工作原理 SSR原理 SSR是基于SS(Shadow socks)开发的 加密代理 软件 原理其实很简单 就是使用 socks5代理 socks代理只是简单的传递数据包，而不必关心是何种协议，所以socks代理比其他应用层代理要快的多。 socks5代理是把你的网络数据请求通过一条通道(连接你和代理服务器之间的通道)，由服务器转发到目的地， 这个过程中你是没有通过一条专用通道的，只是数据包的发出，然后被代理服务器收到，整个过程并没有额外的处理 通俗的说：现在你有一个代理服务器在香港，比如你现在想要访问google，你的电脑发出请求，流量通过socks5连接发到你在香港的服务器上，然后再由你在香港的服务器去访问google，再把访问结果传回你的电脑，这样就实现了翻 墙。 讲了这一大堆看似好像都跟 ping 谷歌没啥关系，不要着急，下面咱就切入正题~ 上面谈到了SSR的核心就是 socks代理，那socks又是啥呢？ socks代理 SOCKS是一种网络传输协议，主要用于客户端与外网服务器之间通讯的中间传递。（定义）

I would like to connect to an REST Web Service through a VPN. Is there a way in Java to establish an pptp, l2tp ipsec connection to the VPN gateway an tunnel the HTTP request, without using the Operation System functions? This is important because I will connected to several rest services from a servlet. This Services could be behind different VPNs and I do not want to connect the network of the server with this VPNs. Do anyone know about an API for that? If you want to connect to a server behind a private VPN, from the outside, nothing you can do on you app can/will allow you to do connect.

Closed . This question needs to be more focused . It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post . Closed 4 years ago . Is it possible to check if a user is connected to a VPN and retrieve internal IP address through Javascript? You can't check for VPN usage nor get the IP address of a user with just JavaScript on the browser. Your best bet would be to look for VPN IP blacklists to integrate with your server configuration, these will block most free VPNs and some paid ones but the paid ones will

In an iOS application if you had to access corporate remote services, through VPN, what would be your pattern to ensure you have connectivity and inform the user if that's not the case: check that your network and VPN are working (by checking if some host like google.com and some private enterprise host are reachable) and if that's the case then call the remote service? or call directly the remote service, and if there is a network exception, then check if both a network host and an enterprise host are reachable? (to find-out what's going on and inform the user) or you would do it differently?

Just a quick question as Google isn't throwing up much. Is it possible to create a VPN connection using native code in Android? And if so does the VPN offer support for keep alives? I believe it would be more of a permissions issue than of an exposed or not exposed issue. Most VPN connections would need you to modify and access the network filtering calls of your kernel. Since your app should really be operating in it's own sandbox this is something I would doubt is exposed by default (to apps at least) since you would essentially be modifying the way the entire OS routes network traffic. For

guys. I want to use the windows RASDIAL in my app to connect to a VPN. I'm using this cmd command: rasdial a-1 username pass I just want to know, how to save password in this command for the next connects? Thanks. In Windows 10, rasphone will always prompt for credentials (Option to skip this step is gone. Thanks, Microsoft!). But I was able to use my saved password with rasdial by using EAP authentication: Without EAP, MS-CHAP v2 does not work. Now I can just execute rasdial VpnName , and it uses my saved password. Dudaskank Probably the OP already solve the problem (asked 4 years ago), but

ROS+L2TP+IPSEC 在WIN7X64,WIN8.1,WIN10,MACBOOK和苹果的IOS10调试L2TP/IPSEC通过 请注意IPSEC，要求客户端IP必须唯一，不可以有重复，那么访问VPN服务器的客户端IP，就不可以多用户同时通过NAT去访问外部的VPN服务器！！！这点要注意，如果想多用户在一个NAT访问VPN服务器，必须先让本地的路由器跟VPN服务器建立GRE隧道，然后访问VPN服务器的客户端，不可以使用NAT或者伪装访问VPN服务器，必须使用静态路由的方式访问，这样在VPN服务器那端，看到客户端的IP就是局域网的真实IP！！！这点非常重要。请注意！ 参考官方文档： http://wiki.mikrotik.com/wiki/Manual:IP/IPsec#Ipsec.2FL2TP_behind_NAT http://www.nasa-security.net/mikrotik/mikrotik-l2tp-with-ipsec/ 1、开启L2TP服务 2、设置IP地址池 3、创建L2TP的模版，L2TP的密钥设置为空，不用设置，加密走IPSEC 4、创建L2TP帐号 5、创建ipsec的加密模版 6、创建IPSEC的连接，注意要把nat traversal打勾，Generate Policy为port override IPSEC的密钥为test456