What is a remote access server, what does a remote access server mean?

Windows 2003 Server The remote access server is a computer that activates the Routing and Remote Access service, providing remote clients access to the entire network's shared resources, or restrictions can only be Access on the resources of the remote access server. The server must have at least one modem or a multiport adapter, an analog phone line, or other WAN connection. If the server provides access to the network, you must also install a network card and connect to the network that the server provides access to. For access to the virtual private network via the Internet, the general server should have a permanent connection to the Internet (if the ISP supports the Demand-Dial connection, it can also be a non-permanent connection).

Some concepts of VPN

1. VPN creates a network tunnel for transmitting data between LANs, which is encrypted during data transmission to ensure security.

2.VPN is based on two protocols, PPTP (Point-to-Point Tunneling Protocol) and L2TP (Layer 2 Tunneling Protocol).

PPTP encapsulates PPP桢 into IP packets, bases with TCP, creates, maintains, terminates tunnels and encrypts or compresses PPP桢. Because Windows uses MPPE protocol encryption (microsoft point-to-point protocol) must be used EAP, or MS-CHAP authentication protocol.

L2TP encapsulates PPP frames into UDP messages, which can be used as a tunneling protocol for the Internet or private networks. IPSEC is used for information encryption. (IPSEC is a network layer protocol, which provides IP packet security.)