Dialup Networking with TCP/IP
You intend to setup a configuration like:
where a TCP/IP connection is required for
either connection to a mainframe (which is most often done via
TCP/IP) or to other systems on a company internal
In such configuration, you need to be aware about a limitation of
Windows95/98 ( as it is documented in
detail in the Resource Kit) :
That forces the use of Windows NT workstation (or server) as a
Dialup Networking server (and in some cases
forces the presence of a Windows NT server, see below)
1) Setup of Windows NT
workstation as RAS server
I am starting with an NT4 workstation, connected to both a Novell
Netware server (using IPX/SPX) and to a Windows NT4 server (using TCP/IP).
||For the connection to the Novell Netware
server, "Client Service for Netware"
However, to keep it simple, I will
configure RAS only for connection to
the Windows NT server and other TCP/IP
( for connection to Novell, see :
via NT4 RAS/DUN to Netware)
||TCP/IP is configured for a private range
I start now the installation of RAS (the modem is
already installed and configured):
||It starts up directly the
configuration of RAS, asking
to add the modem as
||Since I like to use this
system also for my connection
to the Internet, I configure it
for "Dial in and Receive Calls"
||I configured the Network for
TCP/IP for my dialout
connection (to the Internet) and
the Server setting in this case
only for TCP/IP.
I need to configure the
||I like to connect not just to the
Windows NT station, running
RAS, but to ALL systems on
the entire Network.
I need to define the method
of IP-address assignment.
In this example, I did NOT use
DHCP, but assigned a pool of
IP-addresses not yet used on
the local network segment.
NOTE: I use as IP-address the
SAME subnet (192.168.1.x)
as for my Network card !
||The reminder, that you need to
assign a permission to the
Users, which are allowed to
connect via RAS
||Check, that the TCP/IP
protocol is configured for
routing, that IP Forwarding is
To test you setup:
- define now a
connection to the Internet
- configure the
- make a connection
to the Internet.
Then, start up RAS for Dialin (either manual startup or automatic on boot).
Wait now for an incoming call.
2) Setting up a Windows95/98
||Install your Modem, then
Dialup Networking (DUN)
(I prefer now to always use
the DUN 1.2 Upgrade and
install it, even if I do NOT
||Define the connection to the
Windows NT RAS Server,
then configure the connection:
- you MUST logon
- define the TCP/IP settings
||Since the NT RAS server is
assigning the IP-address, we
can leave all items on
||we are ready to connect, to dial:
define the username (and password),
as defined in the NT-system.
(I also suggest, that you logon to your
Windows Client using already this
Username and password to
identify yourself, that will avoid later
access permissions issues, when
connecting to the remote network)
||To check your connection, run
WINIPCFG (type it
into the RUN-menu)
and see, which IP-address has been
assigned to you.
||check, with PING, that you
working connection to the systems on
the network cable (like: the NT server
and/or the mainframe) to ensure, that the
IP-routing / forwarding is working.
|We can check the incoming
the Windows NT RAS server:
||Either using RAS Admin or
Dialup-Monitor, we can see
also the IP-address assigned
to the Client.
||using in a DOS-box
the IP-address assigned to
the Dialup-adapter of the
RAS server to handling the
Now we like to access the data on the disk of the NT4 RAS server
the disk of the NT4 server, so we look into Network
||But Network Neighborhood shows
only "Entire Network"
double-clicking that brings up
the famous message:
"Unable to browse the Network"
Your system could not find
any Browse-master !
||Trying it via FIND/COMPUTER
doe also not locate any
system on the network.
I have not found
anywhere a clear explanation for this behavior, so I worked out
for myself the following reasoning (if
I am wrong, please correct me):
The systems on the local Ethernet network work out
between themselves the election of the Browse-Master (which should be in my case the NT server), but this automatic selection and the
participation to the Browse-Master database is NOT automatically
available for other network connections, like the RAS clients.
To make the Workgroup (and its BrowseMaster) available to other
network segments, the workgroup concept is enhanced: Systems are
not anymore working out itself, who is a member of the workgroup,
but register themselves at a predefined system using a special
database, which then can also be queried for information. On
Microsoft networks, this is the:
which can ONLY be installed and run on a Windows NT SERVER
(not on Windows 95 / 98 or on a Windows NT
|Installation of WINS on
Windows NT server:
||On the Windows NT Server,
add as additional Service
Windows Internet Name Service
||Here is the purpose of WINS,
as defined by Microsoft:
"Dynamic name registration and
resolution service that maps
NetBIOS computer names to
||There is then a WINS manager
in the Administrative Tools.
||But what I have read about WINS,
it is fairly much "maintenance free",
no need to configure/setup.
|Configure the Windows NT RAS Dialin
system for WINS
||On the NT RAS system,
configure now the TCP/IP to include
the definition of a WINS-server
(in this case: the IP-address of the
(there seem to be other methods,
like using DNS or LMHOSTS,
which I still need to check out).
When we now connect (dialin) on the Windows95 / 98 client:
||WINIFCFG show now also the
address of the WINS server.
||The Network Neighborhood allows
now the access to the shared resources
on the local area network (LAN).
3) Access from the LAN to the
disk of the Remote Client
A question, sometimes asked: can the Remote Client share its disk
||On the Windows95 / NT4 client,
install File-and-Print sharing
||You MUST share SOMETHING !
|On the systems on the Local area Network:
||The RAS Client did NOT show up
in the Network Neighborhood of the
LAN systems, but it can be located via
FIND/COMPUTER and then accessed.