Dial-Up Networking Call Back
Setting up a "Dial-In
Connection" opens a door for "unwanted
visitors", which far too often manage to break in to
systems. Setting up passwords gives only a limited protection,
because unluckily, a lot of people choose easy-to-remember
password (like: the of your wife/children or their birthday).
Security can be largely improved by implementing "Call
once the server has identified the caller, the connection is
terminated, and then the server calls you back, re-establishing
On the RAS server, define for each user in the "Remote
||In addition of allowing a user to
"dial-in", define the "Call Back"
option and preset the number,
allowing this user to connect
ONLY from this predefined
Setup of a Windows NT 4
Select from the "More"-button
the "User Preferences:"
You can enter here (optional) the number to be called back, but
that would NOT give you the additional security, we have already
defined a FIXED call-back number on the server.
||we start our connection in the usual method by
dialing from the "Dial-Up Networking Client
to the "Remote Access Server"
||Once the server "picks up the phone", the
systems verify the "user-name" and
||The connection is then terminated, and the
"Dial-Up Networking Client" now waits for
the "Remote Access Server" to call back.
||Within a few seconds, the return call come in.
The "username " and "password" is
again, then the connection is finalized.
||Then, you are connected.
Setup of a Windows95 Dial-Up
When defining your connection from a Windows95 "Dial-Up
Networking" Client, there is no possibility to
define a Call-Back option.
However, the functionality is fully supported
||You start your connection.
||When the server "picks up the phone",
the "user-name" and "password" is
verified, used to identify the caller.
||You then get informed about the
"Possibility" for a "call-Back".
However, if the Server enforces
a specific call-back number, you
can only go ahead: OK
||The connection is terminated, and
your "Dial-Up Networking" Client
is now waiting for the call-back.
||"User-name" and "Password" are
You are now connected and can browse the system.