Wireless problems when connected via ethernet cable

[alex389]

So I have a weird issue that I was wondering if anyone could help me with. I am using a Linksys WRT54GL router for my house and I have most of the computers connected wirelessly to it. The weird issue I have is that when I connected a computer running Ubuntu (9.10) to the router directly with an ethernet cable, it kills the wireless for all of the other computers in the house. As soon as I disconnect the cable, the wireless works fine. I've had this problem with multiple ethernet cables, two different Linksys WRT54GL routers and two different computers running Ubuntu 9.10. I've tried different firmware for the router also. However, the problem occurs regardless of what components I use. Basically, the only thing constant here seems to be that it only happens when my router is connected directly via ethernet cable to a computer running Ubuntu 9.10. I haven't noticed any other times when this problem would come up, and it works fine as soon as I disconnect it. I'm not an expert at Linux or networking, but it seems like maybe this is some issue with my networking settings. Does anyone have a clue why this could be happening?

[slooksterpsv]

When you wire in, what IP address is your ubuntu getting:
Open Terminal, type in the following, then copy and paste it back here:

ifconfig

On a machine that is wireless to the router, type in, in a command prompt (if they're running Windows):

ipconfig /all

and return the results here as well.

EDIT: Also, what port are you plugging your computer into? It's not an uplink port or the internet port is it?

[alex389]

I am plugging my computer into one of the ports number 1-4. It's not the internet or uplink port, and the same port works fine when that computer runs windows.

Here is what I get in Ubuntu, connected via ethernet, when I do ifconfig.

eth0 Link encap:Ethernet HWaddr 00:1c:23:92:fd:35
inet addr:192.168.0.100 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::21c:23ff:fe92:fd35/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:684 errors:0 dropped:0 overruns:0 frame:0
TX packets:670 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:602985 (602.9 KB) TX bytes:131565 (131.5 KB)
Interrupt:17

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:240 (240.0 B) TX bytes:240 (240.0 B)

wlan1 Link encap:Ethernet HWaddr 00:19:d2:75:5f:7d
inet6 addr: fe80::219:d2ff:fe75:5f7d/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:60 errors:0 dropped:0 overruns:0 frame:0
TX packets:42 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:10598 (10.5 KB) TX bytes:6469 (6.4 KB)

wmaster0 Link encap:UNSPEC HWaddr 00-19-D2-75-5F-7D-37-35-00-00-00-00-00-00-00-00
UP RUNNING MTU:0 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

[alex389]

Here is what I am getting on a Windows computer, connected wirelessly, using ipconfig /all.

Windows IP Configuration

Host Name . . . . . . . . . . . . : MARINA-LAPTOP
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Dell Wireless 1395 WLAN Mini-Card
Physical Address. . . . . . . . . : 00-22-69-A1-BB-94
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 192.168.0.106(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Sunday, January 03, 2010 11:37:23 AM
Lease Expires . . . . . . . . . . : Monday, January 04, 2010 11:37:23 PM
Default Gateway . . . . . . . . . : 192.168.0.1
DHCP Server . . . . . . . . . . . : 192.168.0.1
DNS Servers . . . . . . . . . . . : 192.168.0.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Marvell Yukon 88E8040 PCI-E Fast Ethernet
Controller
Physical Address. . . . . . . . . : 00-21-9B-F0-D4-7D
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

[alex389]

The one thing I forgot to mention is that this problem isn't always consistent. Sometimes, it only happens after the Ubuntu computer (connected via ethernet) is connected for some amount of time. In the output I pasted above, I had the Ubuntu computer connected by wire and the Windows computer connected wirelessly, but for some reason, the router did not drop the wireless that time. Sometimes it happens as soon as I plug in the Ubuntu computer, and other times it works fine for hours and then stops working randomly. Unfortunately, I couldn't reproduce the issue just now, but hopefully the above information may still help.

[alex389]

So does anyone have a clue why this issue could be happening or how to fix it?