When LAN is connected, the WLAN chokes

O

Oort Cloud

As soon as I connect the LAN cable to my laptop from my desktop, I'm start
having trouble with my desktop WLAN.
My USB WLAN adapter shows green light, connection is reported as "connected"
and the strength is very good, and the wireless gateway in the other room
(it's connected with a LAN cable to my other desktop) works just fine. My
wife can browse the Internet on her laptop just fine.

The funny thing is the WLAN connection is not completely severed. It can
come back for a few seconds and then off it goes again.
As soon as I disconnect the LAN cable everything comes back to normal and
the WLAN connection is re-established.
Where should I look for a solution for this problem, folks? any help would
be greatly appreciated.
 
M

M.I.5¾

Oort Cloud said:
As soon as I connect the LAN cable to my laptop from my desktop, I'm start
having trouble with my desktop WLAN.
My USB WLAN adapter shows green light, connection is reported as
"connected" and the strength is very good, and the wireless gateway in the
other room (it's connected with a LAN cable to my other desktop) works
just fine. My wife can browse the Internet on her laptop just fine.

The funny thing is the WLAN connection is not completely severed. It can
come back for a few seconds and then off it goes again.
As soon as I disconnect the LAN cable everything comes back to normal and
the WLAN connection is re-established.
Where should I look for a solution for this problem, folks? any help would
be greatly appreciated.
Click to expand...

Your post suggest that you are connecting the laptop directly to the desktop
rather than via a hub. If this is the case, are you aware that you need to
use a reversed ethernet cable?
 
O

Oort Cloud

The cable I'm using is CAT 5e 4pr 24AWG. Is that a reversal cable. Actually,
I haven't had any prob. with this cable until now.
 
P

Pegasus \(MVP\)

Oort Cloud said:
As soon as I connect the LAN cable to my laptop from my desktop, I'm start
having trouble with my desktop WLAN.
My USB WLAN adapter shows green light, connection is reported as
"connected" and the strength is very good, and the wireless gateway in the
other room (it's connected with a LAN cable to my other desktop) works
just fine. My wife can browse the Internet on her laptop just fine.

The funny thing is the WLAN connection is not completely severed. It can
come back for a few seconds and then off it goes again.
As soon as I disconnect the LAN cable everything comes back to normal and
the WLAN connection is re-established.
Where should I look for a solution for this problem, folks? any help would
be greatly appreciated.
Click to expand...

Are you saying that you're connecting your laptop directly to your desktop?
If so, can each machine ping the other machine?

It would be helpful if you ran the following diagnostics on each machine
while they are NOT connected:
1. Click Start/Run/cmd{OK}
2. Type these commands:
ipconfig /all > c:\IP.txt{Enter}
notepad c:\IP.txt{Enter}
3. Paste the text into your reply.

Now repeat Steps 1..3 while the machines are connected.
 
O

Oort Cloud

These are the settings for when both computers are connected with the LAN
cable. I noticed that the number for the Local Area connection's Default
Gateway was different on the laptop, so I corrected that to make them
identical on both computers: 172.16.9.1. After that the wireless connection
was fixed. However, I can't understand one thing: why the desktop won't
display default Gateway number for the Local Area with ipconfig command,
while it IS displayed in windows TC/IP settings?

Thank you.


My Desktop:

Windows IP Configuration



Host Name . . . . . . . . . . . . : SG-Command

Primary Dns Suffix . . . . . . . :

Node Type . . . . . . . . . . . . : Broadcast

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

DNS Suffix Search List. . . . . . : gateway.2wire.net



Ethernet adapter Local Area Connection:



Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Intel(R) PRO/1000 CT Network
Connection

Physical Address. . . . . . . . . : 00-0D-61-20-C4-BF

Dhcp Enabled. . . . . . . . . . . : No

IP Address. . . . . . . . . . . . : 192.168.0.2

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . :

DNS Servers . . . . . . . . . . . : 85.225.113.139

85.255.112.186



Ethernet adapter Wireless Network Connection 3:



Connection-specific DNS Suffix . : gateway.2wire.net

Description . . . . . . . . . . . : Wireless USB Card

Physical Address. . . . . . . . . : 00-D0-41-AD-2C-9E

Dhcp Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

IP Address. . . . . . . . . . . . : 192.168.1.66

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . : 192.168.1.254

DHCP Server . . . . . . . . . . . : 192.168.1.254

DNS Servers . . . . . . . . . . . : 192.168.1.254

Lease Obtained. . . . . . . . . . : Thursday, December 11, 2008
11:11:28 AM

Lease Expires . . . . . . . . . . : Friday, December 12, 2008
11:11:28 AM



Ethernet adapter Bluetooth Network Connection:



Media State . . . . . . . . . . . : Media disconnected

Description . . . . . . . . . . . : Bluetooth Device (Personal Area
Network) #7

Physical Address. . . . . . . . . : 00-0F-3D-4B-FB-16
----------------------------------------------------------------------------------------------------------------------------------------------------

My Laptop:

Windows IP Configuration



Host Name . . . . . . . . . . . . : oryonstation

Primary Dns Suffix . . . . . . . :

Node Type . . . . . . . . . . . . : Broadcast

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

DNS Suffix Search List. . . . . . : gateway.2wire.net



Ethernet adapter Wireless Network Connection:



Connection-specific DNS Suffix . : gateway.2wire.net

Description . . . . . . . . . . . : Intel(R) PRO/Wireless 2200BG
Network Connection

Physical Address. . . . . . . . . : 00-0E-35-63-E4-CF

Dhcp Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

IP Address. . . . . . . . . . . . : 192.168.1.69

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . : 192.168.1.254

DHCP Server . . . . . . . . . . . : 192.168.1.254

DNS Servers . . . . . . . . . . . : 192.168.1.254

Lease Obtained. . . . . . . . . . : Thursday, December 11, 2008
12:50:03 PM

Lease Expires . . . . . . . . . . : Friday, December 12, 2008
12:50:03 PM



Ethernet adapter Local Area Connection:



Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Realtek RTL8169/8110 Family
Gigabit Ethernet NIC

Physical Address. . . . . . . . . : 00-90-F5-3A-3F-17

Dhcp Enabled. . . . . . . . . . . : No

IP Address. . . . . . . . . . . . : 192.168.0.3

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . : 172.16.9.1

DNS Servers . . . . . . . . . . . : 85.255.113.139

85.255.112.186



Ethernet adapter Bluetooth Network Connection:



Media State . . . . . . . . . . . : Media disconnected

Description . . . . . . . . . . . : Bluetooth Device (Personal Area
Network)

Physical Address. . . . . . . . . : 00-10-60-A3-F6-F0
 
P

Pegasus \(MVP\)

Glad to hear that you fixed your problem. I can't answer your question about
the default gateway address because I don't know what you mean with "Windows
TCP/IP settings".
 
O

Oort Cloud

I meant in Internet Protocol (TC/IP) Settings Window, I do see the Defaul
Gateway setting number. No such number -- as you saw in my post -- when the
settings are displayed with ipconfig command.
By the way, I spoke too soon. The problem was not eliminated. After a bout
half hour of good connection while Tthe LAN cable was connected, the
wireless went south again. This is a true mistery to me. Again, as soon as I
disconnected the cable, the wlan is back and working.
 
P

Pegasus \(MVP\)

I'm still not clear how you are connecting your machines. Are you using your
desktop PC as an Internet gateway for other machines?
 
O

Oort Cloud

No there's another desktop that the my wireless access point is connected
to. That desktop is "directly" connected to the Internet thru this Access
point/gateway. My other desktop and our two laptops are connected to the
Access point wirelessly.
So my desktop communicates with the access point just fine as long as it's
not connected to my laptop with an Ethernet cable.
When it is connected, eventually it refuses to access the Internet (email
with Outlook Express, browsing), although Win XP reports that the connection
is good and the wireless USB adapter has the green light.

Thanks
 
P

Pegasus \(MVP\)

You currently have some machines on DHCP and others on a fixed address. I
would simplify things by giving each machine a set of fixed addresses, e.g.
like so:

IP Addresses. . . . . . . . . . . . : 192.168.1.66, 67, 68, 69, 80
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.254
DNS Servers . . . . . . . . . . . : 192.168.1.254

Make a note of the old addresses so that you can easily restore them if
necessary.
 

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