can I change my media access control (MAC) address
under Windows NT 4.0?
Each network adapter card has a MAC address, which
workstations on local subnets use to talk to each
other. MAC addresses are usually burned into the adapters
during the manufacturing process. To overwrite a network
adapter card's default MAC address, perform the following
Start the registry editor (use regedit.exe)
Navigate to KEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\<networkadapter>\Parameters
From the Edit menu, select New-String Value
Type a name of Network Address, and press Enter
Double-click the new value, and enter the adapter's
new MAC value
Close the registry editor
Reboot the machine
How do I create a password reset disk for a computer
that's a member of Windows XP domain?
can't create a password reset disk for a domain account,
but you can create this disk for a local account on
a machine that's a member of a domain. To create the
disk, perform the following steps:
Press Ctrl + Alt + Delete to open the Security
Click Change Password
Select Log on to specify the local computer
Click Backup to start the Forgotten Password Wizard
In the "Current user account password"
box, type your password and click Next
The Forgotten Password Wizard creates the password-reset
disk. Click Next, then click Finish. The Forgotten
Password Wizard returns you to the Change Password
Remove the password-reset disk. Label the disk
and store it in a safe place
Click Cancel to exit the Change Password dialog
Click Cancel to exit the Windows Security dialog
Is it possible to join a broken CAT5 cable by soldering
the parts back together?
may cause problems, as CAT 5 cable insulation melts
extremely fast even with low wattage irons. The wires
cannot be untwisted more than ½ inch total.
Use shrink-wrap if you try soldering. Crimp an RJ-45
plug on each end of the broken cable and "glue"
them back together with a CAT 5 coupler. Be sure the
coupler and plugs are rated for CAT 5 or 5e and that
the plugs match the type of cable. There are plugs
for stranded core and solid core cables. Horizontal
runs are supposed to be solid core and can be up to
90 meters long (100 meters if connected directly from
a hub or switch to a PC). The coupler may effectively
reduce this length somewhat.
What is Pathping?
a utility that's new to Windows 2000, is something
of a cross between the Ping and Traceroute utilities.
The Pathping utility sends packets to each router
on the way to a final destination over a period of
time and computes results based on the packets that
return from each hop. Because Pathping shows the degree
of packet loss at any given router or link, you can
determine which routers or links might be causing
I would like to know how to check or see which
TCP ports are in use?
Netstat command can list currently used ports, which
might be helpful if you suspect an application is
clashing with another one on an active port. Use the
-an switch to show all connections and listening ports
in numeric form.
C:\> netstat -an
Check the output for any port that you think your
program might use.
Can I run voice and data (Ethernet) through the
same cable can be used for running voice as well as
data applications though it is not recommended. If
you use the same cable for both voice as well as data,
this will open your network to interference and other
performance issues (when your phone rings the line
is carrying a 90V AC signal). This may limit the future
flexibility of your network. You also run the slight
risk that a 40-100VDC-telephone signal might get inadvertently
connected to your network card. It is best to think
of each cable that is to be used for networks as a
single purpose device. Your network will not be Cat5
compliant if you do this.
What is a 'stackable' hub, why would I want one?
means that two or more hubs can be connected via a
special cable so that the number of ports is increased,
without adding more 'hops' to the network. The typical
way to add another hub to a network is by using a
regular Ethernet crossover cable to go between one
port on each hub. This creates a 'hop', which can
cause more delay in the network. For two hubs, this
hop will hardly be noticed, with many hubs, the additional
hops may violate Ethernet specs. Typically you want
4 (or less) hops between any two nodes on the network.
I'm setting up a local area network and want to
use TCP/IP and private IP addresses. What IP addresses
should I use?
Internet Assigned Numbers Authority has reserved the
following ranges of IP addresses for use in private
10.0.0.1 - 10.255.255.254
of private network addresses are:
10.0.0.2, 10.0.0.3, ..., subnet mask 255.0.0.0
192.168.0.2, 192.168.0.3, ..., subnet mask
I want to copy files from one computer to another,
but there are too many files to do it with a floppy
disks. Is it possible to connect them using a cable?
There are many ways to connect two computers running
1. Use the DOS programs Interlnk and Intersvr to make
a serial or parallel port connection. File transfer
is possible only from the Intersvr machine to the
2. Use Direct Cable Connection to make a serial or
parallel port connection. File transfer is possible
only from the "host" machine to the "guest"
3. Create a peer-to-peer Ethernet network. You install
an Ethernet adapter on each machine and connect them
with networking cables. Most Ethernet adapters plug
into PCI or ISA slots inside the machines. If you
don't want to open the machines, use Ethernet adapters
which connect to USB ports.
Ethernet connection has two distinct advantages:
it is the fastest and it provides two-way connectivity.
Additionally, each machine can access files and printers
on the other.
I use the IPX/SPX protocol for multiplayer games.
I would also like to use it for file and printer sharing.
I tried doing that but can't get all the computers
to see each other.
Problems with IPX/SPX can usually be resolved by tweaking
some settings in the IPX/SPX- NIC properties on all
of the networked computers:
NetBIOS tab: enable NetBIOS support.
Advanced tab: specify an explicit frame type,
such as Ethernet 802.3.
Advanced tab: set all of the Network Addresses
to the same value.
Why is that we cannot join a Windows NT 4.0 domain
to a Windows XP or Windows 2000 client?
XP and 2000 use DNS instead of NetBIOS to name domains.
As a result, if you've installed only TCP/IP on the
XP or Win2K client and you've disabled NetBIOS over
TCP/IP, the client can't join an NT 4.0 domain. To
enable NetBIOS over TCP/IP, perform the following
From the Start menu, select Settings, and click
Network and Dial-up Connection
Right-click Local Area Connection, and select
Properties from the context menu
Click Internet Protocol (TCP/IP), and click Properties
Click Advanced, and select the WINS tab
Click "Enable NetBIOS over TCP/IP"
Click OK, and ignore the WINS error
Click OK to close all dialog boxes.
If you don't want to use NetBIOS over TCP/IP, you
can instead use NetBEUI on all clients.
How can I tell if a Dynamic Host Configuration
Protocol (DHCP) Server is running/working on my network?
DHCP allows you to establish a range of valid IP addresses
to be used per subnetwork [192.168.0.1, 192.168.0.2,
192.168.0.254 comprise a subnetwork].
An individual IP address from the range is assigned
dynamically to any DHCP client requesting an address.
DHCP also allows you to establish a lease time that
defines how long an IP address is to remain valid.
Other configuration parameters can also be assigned
using DHCP, such as subnet mask, DNS and WINS server
identification, and so on.
Windows 9X/Me: Click Start, Run, enter winipcfg,
click the More Info button, select the appropriate
network adapter, and see if there is anything in the
DHCP Server box. Click release followed by renew to
test the DHCP server.
Windows 2000 and NT (and probably Windows XP): Start,
Run, enter cmd, and type the following in the resulting
also works with Windows 9X/Me.
How do I test an Ethernet network interface card
NICs or network adapters come with one or more floppy
disks containing drivers, etc. for various operating
systems. These floppies also usually include a diagnostic
program to test the NIC. Many of these programs are
DOS-based and must be run by booting the computer
to DOS or from a DOS window. Unless you have a loop
back plug installed, the loop back test will probably
fail. A loop back plug directs signals from the NIC's
transmitter back to its receiver. An indicator that
NIC and cabling is functioning is to check the LINK
(sometimes labeled LNK) and Activity (ACT) LEDs, if
there are any, on the NIC and on the device at the
other end of the cable. The LINK should be solid with
no flickering and the ACTIVITY should be blinking,
which indicates network activity. This indication
is not as thorough a test as the diagnostics program
and it is not foolproof.
The diagnostics program and LED observations may not
conclusively show that the NIC is fully functional
in Windows. Look for exclamation marks beside the
NIC driver in the Windows 9x/Me Device Manager (click
Start-Settings-Control Panel-System-Device Manager...),
which indicate a resource conflict and run the Windows
Resource Conflict Troubleshooter if you find any.
Look for multiple instances of the NIC driver in the
network configuration (click Start-Settings- Control
Panel-Network and remove all of them, if you find
any. Restart Windows and reinstall the driver. Run
hwinfo (click Start-Run and type hwinfo /ui). To help
narrow-down problems, click View in the main menu
and select Devices with Problems. Once these steps
are completed and the NIC passes, try copying about
100 Mb of files to another computer on the network.
Net diag and ping are useful tools for further testing
a NIC and a network. For more info, open a DOS windows
Ping requires that the TCP/IP protocol be installed,
and IP addresses be assigned at both ends of the network
segment to be tested.
Net diag is a useful low-level network test.
How can I get Network Neighborhood to appear on
Run Tweak UI, go to the Desktop tab, put a check mark
in the Network Neighborhood box, and click Apply and
OK. If this doesn't work, go to Control Panel-Network.
Remove Client for Microsoft Networks if it is present.
Then add Client for Microsoft Networks. There might
be a system policy hiding Network Neighborhood. Run
the registry editor, open this key:
and delete the value named "NoNetHood".
I have a connectivity problem to my ISP. Windows
98 takes forever to connect to the ISP. It says "Logging
on to network..." and just sits there. What's
Go to My Computer-Dial-Up Networking. Right click
Your connection and select properties. Under the Server
Types tab, un-check the Log on to network box.
On Windows 2000/ME (client machine), I am unable
to connect to my RAS server using dialup. It gives
error 619, port was disconnected. But I am able to
connect to the Internet thereby ruling out problem
of modem connectivity. I am able to connect to RAS
server on Windows 95/98 but not on Windows 2000/ME
(client machine). Kindly help.
This issue occurs because the account you were logged
on with at the time you joined the domain did not
have administrator privileges on the Windows 2000
domain. Because of this, services that could easily
compromise network security, such as RRAS, deny clients
the ability to obtain access to the domain.
I would suggest that you do the following to solve
Firstly you must register the RRAS server in Active
Directory using an account that has domain administrator
permissions. To do so follow the steps below:
Add the RRAS Computer to the appropriate group:
Log on your Windows 2000-based computer with an
account that has administrator privileges for
Windows 2000 domain.
Note: This method may be used with Windows NT/2000-based
RRAS or RAS servers.
Launch the Active Directory Users and Computers
MMC snap-in and then double-click your domain
Double-click the Users folder, and then double-click
the RAS and IAS Servers security group.
Select the Members tab.
Add the RRAS server to this group.
Use the Netsh.exe Utility
Note: The Netsh.exe methods can only be used
if the RRAS server is Windows 2000-based.
Use either of the following methods with the Netsh.exe
Method 1: Log on the RRAS computer using an
account that has domain administrator privileges,
type Netsh. RAS add registered server at a command
prompt, and then press enter.
Method 2: To run a command with administrator
privileges without being logged in as an administrator:
At a command prompt on the RRAS computer, type run
as /user:domain name\administrator name "cmd",
where domain name is the appropriate domain name,
and administrator name is the appropriate administrator
name. You are then prompted to enter a password for
this account. If this computer is able to connect
to the domain controller and verify the credentials,
a command prompt opens with the following information
in the title bar: cmd (running as domain name\administrator
At a command prompt, type Netsh. RAS add registered
server at a command prompt, and then press enter.