A feature built into Windows NT that enables users to log into an NT-based LAN using a modem, X.25 connection or WAN link. RAS works with several major network protocols, including TCP/IP, IPX, and NBF.
when the user needs to connect to the lan at the office time to time from remote location the RAS has to configured at the office.the RAS has attached to the modem and a fixed phoneline.once the remote user dials to the phone number of RAS using his dialup connection the RAS accepts the call and validate user credential.if the user is authorised he is allowed to connect to the office lan.
in remote access,the callback option is allow the RAS to called back to the remote user once the account validated.there are 2 options,
- set by a caller
- always callback to