Remote Access Facts

Remote Access Facts

Remote access allows a host to connect remotely to a private server or a network to access resources on that server or network. Remote access connections are typically used to connect remotely to servers at your office, but can also describe the type of connections used to connect to an Internet Service Provider (ISP) for Internet access. A remote access server is a server configured to allow remote access connections.

The following process is used to establish a remote access connection.

Process | Description |

Physical connection | As a first step, clients must establish a physical connection to the remote access server. * For dialup clients, this process includes getting a dial tone, dialing the number of the remote access server, and having the remote access server answer the incoming call. * For clients with a broadband or always on connection, the connection is established when you connect the device to the network and turn it on. |

Connection parameters | After the physical connection is established, a Data Link layer connection is established. During this phase, additional parameters that will be used during the connection are established. For example, the devices identify the upper-layer protocols that they will use during the connection. Protocols negotiated at this phase control: * Upper-layer protocol suite (such as IP) * Network-layer addressing * Compression (if any) * Encryption (if any) * The authentication method to useTwo common protocols used during this phase are: * The Point-to-Point Protocol (PPP) is used for dial-up connections. * PPP over Ethernet (PPPoE) is used for connections that have an "always on" state, such as DSL or fiber optic running Ethernet. PPPoE is a modification of PPP that allows for negotiation of additional parameters that are typically not present on a regular Ethernet network. ISPs typically implement PPPoE to control and monitor Internet access over broadband links.During...