An IP
address conflict occurs
when two computers on a LAN or the Internet have been assigned the same IP. IP
conflicts between two computers normally render either one or both of them
unusable for network operations.
How IP
Address Conflicts Happen
Two
computers can acquire conflicting IP addresses in any of several ways:
· A system administrator assigns two
computers on the LAN the same Static IP Address.
· A system administrator assigns a
computer a static IP address within the local network's DHCP range (dynamic IP
range), and the same address is automatically assigned by the LAN DHCP
server.
· A malfunction in the network's DHCP
server allows the same dynamic address to automatically be assigned to multiple
computers.
· An ISP accidentally assigns two
customers the same IP address (either statically or dynamically).
· A mobile computer is put into standby
/ hibernate mode and then awakened later.
Note that
other forms of IP conflicts can also occur on a network. For example, one computer
may experience an IP address conflict with itself if that computer is
configured with multiple Network Adapters. System administrators may also
create IP conflicts by accidentally connecting two ports of a network switch or
router to each other.
Recognizing
IP Address Conflicts
On most
Microsoft Windows computers, if you attempt to set a fixed (static) IP address
that is already active on the local network, you will receive the following
pop-up error message:
The static IP address that was just configured is already in use on the
network. Please reconfigure a different IP address.
On newer
Microsoft Windows computers having dynamic IP conflicts, you should receive a
balloon error message in the Taskbar as soon as the operating system detects
the issue:
There is an IP address conflict with another system on the network.
Sometimes,
especially on older Windows computers, a message similar to the following may
instead appear in a pop-up window:
The system has detected a conflict for IP address...
On Mac or
Linux computers, a similar message will normally appear on screen.
Resolving IP
Address Conflicts
Try the
following remedies for IP conflicts:
1. For
networks where IP addresses are fixed (statically assigned), ensure each local
host is configured with a
unique IP address.
2. If your
computer has a dynamically assigned address, releasing
and renewing its IP address can
workaround IP address conflicts.
3. If your home router is believed to have a
faulty DHCP server causing IP conflicts on the home network, upgrading the
router firmware may resolve this problem.
Step 1:
Access the router's web-based setup page. For instructions, click here.
NOTE: To learn how to access the web-based setup page on a Mac computer, click here.
Step 2:
Click Setup > Basic Setup.
Step 3:
Make sure that the DHCP Server option is Enabled. Click the DHCP Reservation button if you want to assign a fixed local IP address to a MAC address.
Step 4:
When you click on DHCP Reservation, a new web browser window will pop-up. Click the Select checkbox to reserve a client's IP address. Click the Add Clients button afterwards.
Step 5:
If you want to manually assign an IP address, enter the client's host name in the Enter Client Name field. You can do this as well in the IP Address and MAC address fields.
Step 6:
Click the Add button.
Step 7:
A list of DHCP clients and their fixed local IP
addresses will be displayed at the bottom of the screen. If you want to
remove a client from this list, click the Remove button.
On this window, you can do any of the following:
• Click the button to save your changes.
• Click the button to cancel your changes.
• To view the most up-to-date information, click the button.
• To exit this screen, click the button
If you need more help come back.Post / thumbs / testimonial are welcome!.
Step 1:
Access the router's web-based setup page. For instructions, click here.
NOTE: To learn how to access the web-based setup page on a Mac computer, click here.
Step 2:
Click Setup > Basic Setup.
Step 3:
Make sure that the DHCP Server option is Enabled. Click the DHCP Reservation button if you want to assign a fixed local IP address to a MAC address.
Step 4:
When you click on DHCP Reservation, a new web browser window will pop-up. Click the Select checkbox to reserve a client's IP address. Click the Add Clients button afterwards.
Step 5:
If you want to manually assign an IP address, enter the client's host name in the Enter Client Name field. You can do this as well in the IP Address and MAC address fields.
Step 6:
Click the Add button.
Step 7:
A list of DHCP clients and their fixed local IP
addresses will be displayed at the bottom of the screen. If you want to
remove a client from this list, click the Remove button.
On this window, you can do any of the following:
• Click the button to save your changes.
• Click the button to cancel your changes.
• To view the most up-to-date information, click the button.
• To exit this screen, click the button.
If you need more help come back.Post / thumbs / testimonial are welcome!
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