工信部：未经批准 不得自行建立VPN跨境经营_央广网

The Cisco VPN client is the client side application used to encrypt traffic from an end user's computer to the company network. IPSec is used to encrypt the traffic. When using standard IPSec, IKE is used for the key negotiation and IPSec to encrypt the data. IKE uses UDP port 500 and IPSec uses IP protocol 50, assuming ESP is used. In some cases, UDP port 4500 is also used. This technote will explain when and why. This technote will explain when and why. It is becoming more common for VPN gateway devices or computers running VPN software to negotiate IKE while passing through a third-party NAT device. To enable VPN tunnels between individual host computers or entire networks that have a firewall between them, you must open the following ports: PPTP. To allow PPTP tunnel maintenance traffic, open TCP 1723. To allow PPTP tunneled data to pass through router, open Protocol ID 47. L2TP over IPSec. To allow Internet Key Exchange (IKE), open UDP 500. But the AnyConnect client may also use DTLS (which provides the same type of authentication and encryption as SSL but uses UDP to do it). There is not a standard port for DTLS but I believe that there is an option on the ASA to configure a port for it to use and you would want that UDP port open also. HTH. Rick For most VPN users, UDP provides the best option for general use. The typical recommendation is to start with UDP. And if you experience issues with the connection, try the TCP protocol. Some of the potential problems that may keep you from connecting to a VPN with UDP include: Countries or ISPs blocking UDP ports to prevent VPN connections

It will create a VPN using a virtual TUN network interface (for routing), will listen for client connections on UDP port 1194 (OpenVPN’s official port number), and distribute virtual addresses to connecting clients from the 10.8.0.0/24 subnet.

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In some cases, UDP port 4500 is also used. This technote will explain when and why. This technote will explain when and why. It is becoming more common for VPN gateway devices or computers running VPN software to negotiate IKE while passing through a third-party NAT device.

2015-1-28 · 近日由于部分外国VPN服务在中国受到屏蔽，防火墙的事情再次成为焦点。工信部官员昨天就VPN受屏蔽回答记者提问，强调中国发展互联网一定要按照本国法律法规来进行，一些不良信息应该按照中国法律加以管理。