The document provides a step-by-step guide for troubleshooting LAN connection issues, outlining procedures to diagnose wireless and Ethernet problems. It includes instructions for checking connections, verifying wireless adapters, and router settings to ensure proper network function. Additionally, it suggests methods for testing connectivity and rebooting devices to resolve temporary issues.

1. Step-1
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2. Step 1: troubleshoot LAN connection
problems
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Networks are finicky at best. Wireless or Ethernet, almost
everyone has had their share of network connection
problems. It could be anything from not being to access the
Internet despite being connected to the network, to not being
able to connect to the network at all.
Unfortunately, network connection problems are sometimes
hard to diagnose. A few articles here on Make Use Of give
some help. Guy McDowell’s about weak wireless signals, and
Karl about some simple diagnosis steps are both great
resources.

3. Step-2 Check WAN and LAN connections
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4. Check WAN and LAN
connections
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To view the file in Windows XP, just open up Notepad and go
to File->Open. Then, navigate to your C drive, then to the
“Windows” Folder, then “System32” folder, then “drivers” folder,
then “etc” folder and finally, open the file named “hosts“.
You may have to change where it says “Text Documents” to
“All Files” to see the hosts file.
Connect another Ethernet-capable device, such as a laptop, to
the affected AP or router port. If link status LED s change, the
device that you just replaced may be failing link auto-
negotiation. Check port configurations at both ends and
reconfigure as needed to match speed and duplex mode.

5. Step3- Verify wireless adapter
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6. Step 3 : Verify wireless adapter
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It should only have the heading stuff and maybe the line
designating the local host. Anything else should be deleted.
The instructions are the same for Vista and Windows 7, only
instead of just opening Notepad, you have to right click the
Notepad icon and choose to “Run as administrator” to edit the
file.
When using a Windows client, select your wireless network
adapter from the Network Connections Control Panel and
check to see if its status is Enabled. If not, right-click to enable
the connection. If this fails when using a laptop, look for a
function key or physical button or slider-switch to take the
laptop out of airplane mode.

7. Step 4-
Verify wireless
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8. Step4:
Verify wireless
For XP, got to Control Panel and then Network Connections.
In Windows Vista/7, go to the Control Panel and then the
Network and Sharing Center. In 7, click on “change adapter
settings.” In Vista, click on “manage network connections“.
In all versions of Windows, after you get to the places
designated above, right click the device giving you trouble,
either the Wireless card or Ethernet card. Then select
“Properties.”

9. Step-5
Verify AP and router settings

10. Step-5
Verify AP and router settings
Sometimes what seems like a network outage is actually a problem on a
specific website’s end. If you can’t get on Twitter, check another few
websites to make sure that it’s not just them. You can use Is Up. me to
check if a website is down for everyone or just you.
Go ahead and reboot your PC, as well as your modem and router. To
clear the modem and router caches, wait 60 seconds before you turn
them back on again. Turning everything off and back on first ensures that
it isn’t a temporary problem. It’s better to reboot now than to waste 30
minutes continuing on when you don’t need to.

11. Step-6 router settings
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12. router settings
Identify the IP subnet [and, if applicable, virtual LAN (VLAN) ID]
assigned to that SSID. Upon successful connection, your Wi-Fi
client should receive a local IP address from this subnet.
Identify the router or AP's own local IP address that should be
reachable through this subnet (and, if applicable, VLAN).
Check your router's events log or status GUI to verify that an IP
address from this subnet is indeed assigned to your Wi-Fi client
when it connects.

13. Verify TCP/IP settings
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14. Verify TCP/IP settings
While attempting to connect, status may change briefly to
Authenticating or Acquiring Network Address, then Connected.
At that point, use Status/Support to determine the client's
assigned IP address. If the client's IP is 0.0.0.0 or 169.254.x.x,
click Diagnose. If that persists, go to step 8.
Otherwise, if the Wi-Fi client's IP address is not in your AP or
router's subnet, use the Properties/Internet (TCP/IP) panel to
reconfigure the connection to get an address automatically and
repeat step 4.

15. Connect your computer to the server

16. Connect your computer to the server
Once your wireless client has a valid IP address, use ping to verify
network connectivity.
Run a Command Prompt window from the wireless client's Start menu
and use it to ping your AP or router's IP address with the Internet Control
Message Protocol as shown in Figure 5.
If pinging your AP or router repeatedly fails, skip to step 6.
If pinging your AP or router is successful, then ping any other wired or
wireless LAN client that you wish to share files or printers with. If that ping
fails, then the destination may be using a firewall to block incoming
messages.