Ubuntu Networking :: 10.10 Lab Computers Dropping WiFi Connections
Jan 5, 2011
Our school has a small 3-computer lab in the preschool department where the kids come in and simply use Firefox to access some educational websites. Due to logistics in the building they're in we had to go with a wireless solution in the following setup:
- Apple Airport Extreme WAP
- 3 HP DX2200 desktops running Ubuntu 10.10
- 3 Trendnet TEW-664UB USB wifi chips
All was running great until we got the computers installed on site and now they are constantly dropping the wifi connection if they are even able to connect at all (which is highly hit or miss).
10.10 picked up the USB wifi card as soon as we plugged them in and showed the available networks, but actually obtaining and keeping connections is a nightmare at the point. The computers are in very close proximity to each other (only about 2-3 feet between computers) and the WAP is in the next room (other computers and mobile devices are able to connect to the WAP with full signal from the same room/location). Thats about all the detail I have off the top of my head, could this be an interference issue with the wifi cards or does this sound like an Ubunutu issue? Again we have had multiple other devices in that room all able to connect seamlessly.
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Feb 25, 2010
As soon as i'm starting to copy a large file enough file (>700Mb) to my ubuntu box (connected to an Asus router via wifi) from a Windows 7 client (connected to router via ethernet cable) i get a dramatic drop in speed. upload starts at 1,0Mb/sec with a ping to ubuntu box at <1ms, and in 2 minutes it drops to 200kb/sec with a ping of over 1000ms! The ping increases with every second in a linear progression.
To exlude router as a possible problem copying to a windows 7 notebook connected to router via wifi results in an average of 2,7Mb/sec with an average ping of 150ms.
MB Model: Asus P5B Deluxe wifi
OS: Ubuntu Server 9.10 + desktop installed
Wifi configured via GUI
2. lsusb
3. wlan0
4. lsmod
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Jan 30, 2010
Here is the layout of my network:My cable modem plugs into eth0 on my ubuntu server which acts as a firewall (shorewall) and dhcp server to my lan. A dd-wrt access point is plugged into eth1 and then a bridge connecting my xbox360 and another bridge connecting a desktop computer.Everything works pretty well, except a few times a day, my network will just shut down. The wireless on my macbook and my wife's laptop will just shut down, and if my xbox is running, it will lose connectivity. It will be down for maybe a minute or two, and then come back up like nothing ever happened.I never had this problem when I had just a dd-wrt router running everything instead of my server.When I ssh into my server afterwards and run dmesg, this is what I will get:
Code:
[398598.251548] martian source 169.254.1.255 from 169.254.1.33, on dev eth1
[398598.251565] ll header: ff:ff:ff:ff:ff:ff:00:23:69:3d:b1:82:08:00
[code]....
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Apr 7, 2009
After doing a clean base install of CentOS 5.3 on a test server, I started having problems with network disconnects. While SSH into the box, I would be intermittently disconnected from the SSH session. At first I thought it was my workstation, but after running ping tests from multiple machines on the network to the test box, it became apparent that the test box was dropping packets. When I lose my SSH connection, the pings also start timing out, for a few seconds, then start again. I increased the console logging and I can see when the ethernet port goes up and down when I physically disconnect the cable, but it does not go down or lose link when the disconnects occur. I changed the NIC ports being used and had the same result. I tried with a different switch with same result. I reinstalled CentOS 5.2 and the problem went away.
Upon further investigation, I found that CentOS 5.2 is using the e1000 driver for my NICs and CentOS 5.3 is using the e1000e driver. I resinstalled CentOS 5.3, and tried using the e1000 driver instead of the e1000e but it no longer detects my NIC's... apparently they moved the support from e1000 to e1000e. I have spent the last 3 days googleing for info on this problem and have not found a solution. Any recommendations? Should I submit a bug report?
[Code]...
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Sep 18, 2010
While using Ubuntu two other computers lose their connection. One (main) is connected to the modem, other from the switch to the wireless router, and the one with ubuntu wired via switch. Currently connected with Windows 7, other two are connected. Once booted into Ubuntu rest of the computers disconnect?
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Jan 5, 2010
Here's the situation: I've got an eee pc 901 running Ubuntu 9.10 netbook remix. I'm using it to connect to a WPA-encrypted wireless network on a WRT54GL running dd-wrt. It mostly connects and works ok, but sometimes it just stops working for no apparent reason (the netbook still shows itself as connected), but you can't get anywhere until you manually disconnect and reconnect. Other times, it will drop the connection, and then quickly reconnect (or sometimes not). Obviously, this behavior is pretty irritating. At first I thought the problem was with the router, but I checked the logs there and they all seem fine, and other computers on the same router don't have this problem. Looking at "dmesg | tail" on my netbook, I see a lot of instances of the following error, which I'm thinking is probably the problem:
Code:
[11137.762233] ERROR!!! RTMPCancelTimer failed, Timer hasn't been initialize!
[11142.872797] ===>rt_ioctl_giwscan. 4(4) BSS returned, data->length = 440
[11152.883274] ===>rt_ioctl_giwscan. 5(5) BSS returned, data->length = 556
[11152.883529] ==>rt_ioctl_siwfreq::SIOCSIWFREQ[cmd=0x8b04] (Channel=11)
[11163.952056] ERROR!!! RTMPCancelTimer failed, Timer hasn't been initialize!
I searched for that error message and I found this Ubuntu bug report: [URL] that describes symptoms that match mine. In that report, a poster mentions that he compiled and installed a new version of the wireless driver from the Ralink website, and it fixed his problem. Do you think installing a new driver would be good? Or has that updated driver already been added to the kernel since that bug report was filed? I've never compiled a kernel module before.
One other thing, I also see repeated instances of these lines (or similar ones) in dmesg, which look like they could be related.
Code:
[44096.275923] RX DESC f30ca000 size = 2048
[44096.276885] <-- RTMPAllocTxRxRingMemory, Status=0
[44096.281404] --> Error 2 opening /etc/Wireless/RT2860STA/RT2860STA.dat
[44096.281424] 1. Phy Mode = 0
[44096.281435] 2. Phy Mode = 0
[44096.309841] 3. Phy Mode = 0
[44096.314533] MCS Set = 00 00 00 00 00
[44096.316196] <==== RTMPInitialize, Status=0
[44096.316280] 0x1300 = 000a4260
[44096.401269] ==>rt_ioctl_siwfreq::SIOCSIWFREQ[cmd=0x8b04] (Channel=11)
[44096.472502] ===>rt_ioctl_giwscan. 1(1) BSS returned, data->length = 116
[44096.472977] ==>rt_ioctl_siwfreq::SIOCSIWFREQ[cmd=0x8b04] (Channel=11)
[44106.768056] ra0: no IPv6 routers present
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Dec 12, 2010
I've got a Belkin F5D8055 v1 wifi usb adapter. I use the rt2800usb driver for it. Strangely it uses only 54 Mbit/s instead of 300 Mbit/s. I thought it was ok, since I use the wifi only for accessing the internet. However, the network manager keeps dropping the signal, and I can't understand why. I'm close enough to the router.
iwconfig:
wlan0 IEEE 802.11bgn ESSID:"MyHomeRouter"
Mode:Managed Frequency:2.447 GHz Access Point: 00:22:2D:06:2C:50
[code]....
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May 22, 2010
Alright so i just wanted to try and get remote desktop connections running so i can access files on the other computers in my house. For my first try i went after my laptop. I'm using rdesktop.
First couple times i tried i typed in
Code:
After about 15 seconds it would pop back with
Code:
I realized that my laptop's firewall was blocking the packets, so i created a custom rule that allows all TCP packets on port 3389. So i fired up rdesktop again. Now it pops back with:
Code:
But instantaneously, not after 15 seconds (not sure if thats significant or not.) I checked my firewall's log and it allowed the tcp packets.
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Mar 10, 2010
I've installed Samba on my Home Theater PC but none of my other computers can stay connected to it. Sometimes it drops connections right away, other times it takes several minutes.either way, a pc will never stay connected longer than 20 minutes.
I have the following OS's in my home
OSX Snow Leopard
Server 2003
Server 2008
Windows XP
[Code]...
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May 7, 2010
I was having trouble with my wireless connection, it was dropping every 5 minutes or so after upgrading to 10.04 and ran across a thread where someone recommended entering
Code:
sudo apt-get install linux-backports-modules-wireless-lucid-generic
After entering the command I have lost all ability to even use my wireless ability even if it was for 5 minutes. Now I am using a different kernel, internet still drops every 5 minutes, but would love to get my internet up and running again.
I am using a Dell Studio XPS Laptop
Code:
*-network
description: Ethernet interface
product: MCP79 Ethernet
[Code]....
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Nov 11, 2010
I have a problem with wifi network,installed ubuntu a few days ago.I have bcm 4312 wireless adapter, activated the broadcom STA driver, until this moment i didnt update the OS,just out of the box OS, with activated wireless STA driver.After reboot ,the wifi was working, it found some networks, but it wont connect.Im trying to connect to a WPA2-personal , AES encryption network,i type in the password, im 100% sure i type it correctly, but it wont connect, it just asks for password again and again.I was thinking maybe i should update the OS, and i did it, after the update, i checked the STA driver, it was activated, working fine, but this time Network Manager didnt find any networks,as if there is no wireless device.How can i fix this ?
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Oct 25, 2010
I did a clean install of OpenSuse 11.3 a couple of weekends back. Everything is working great except the SSH server.Once I installed ssh, it appears to accept my connection, allows me to log in, and then freezes Putty, not allowing me to type anything into the terminal.If I wait several minutes, I'll get a message saying that the connection was closed. After that, the server won't accept connections.Sometimes it'll start accepting connections again, but after a while, the connection will close on its own. Other times, I will be unable to get a connection until I restart the server.If you guys needs any more information, please let me know. What could be causing this odd behavior?
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Mar 24, 2011
Pc 1 : netbook with an usb wifi antenna spotted on a free wifi hotspot
Pc 2 : same model netbook that can't access internet
What I need : Share the wifi connection by the 2 internal WLAN on ubuntu by network-manager
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May 21, 2010
I have a question about connections with an ubuntu server. Is there a way to know if the terminal computer (which is connected to my linux server) is using WinSCP to connect (on a Windows platform) or a linux system? It seems they are using the same port (22) and I think the exact same protocol (SSH / SFTP), is there a way to differentiate between the two though? And going farther there, is it possible to limit the connections only to linux terminal computers and reject requests coming from Windows computers?
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Jul 16, 2011
wicd keeps dropping my wifi connection most of the time I can just tell wicd to reconnect the connection never stays up for more than 10 minuets with out doing other times it looks like it connected when it didn't other times it times out when obtaining the ip address in these 2 cases I have to run "etc/rc.d/rc.wicd restart
then tell it to connect sometimes posting on forums requires me to copy my text hit submit hope the connection is still up maybe restart wicd reconnect.is there a bug in wicd or python ?
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Jan 5, 2010
In summary, I am using openSUSE 11.2 x64 on an Acer laptop with a wireless AR928X card. I can connect to my WEP-secured network when I boot up. After some time (it might be minutes, it might be hours), I am prompted for my WEP password again. This never works, despite being the one which gets me on-line at start-up!. The only solution is a reboot. The problem is intermittent and doesn't seem to depend on my on-line activity. I have tried the following with the same result:
KNetworkManager
Traditional using IFUP
Enabling / disabling IPv6 support
I tried installing the compat-wireless package through YaST and then managed to get no internet connection at all. Went back to KNetworkManager and things "worked" again until I was prompted for the WEP code. I have openSUSE 11.2 x64 working on my office laptop without problem and can connect to my home network without any problem. My issues are with my personal laptop. I have reached the stage of booting into Windows 7 as my default option so that I can access the internet reliably. What I can do to diagnose and repair the problem - could it be that the card is going into powersave mode? If so, how do I stop that happening? I'd prefer to be on openSUSE but need to be able to rely on the internet.
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Jul 1, 2011
I installed ubuntu 11.04 on my dell inspiron mini 10. I replaced windows 7 starter but i want to change back as it keeps dropping my wifi connection.
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Dec 1, 2015
I'm trying to use these cookie cutter rules that I found. But every time I use them, after a few seconds my wifi connection goes dead. The exception was the first time I used then. Which lasted me a couple of minutes.
By dead I mean I can no longer open a webpage or ping google.
iptables -N LOGGING
iptables -A INPUT -j LOGGING
iptables -A OUTPUT -j LOGGING
iptables -A LOGGING -m limit --limit 2/min -j LOG --log-prefix "IPTables-Dropped: " --log-level 4
iptables -A LOGGING -j DROP
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May 12, 2015
I have three Toshiba S55 laptops running debian 8 or ubuntu 14.04 with Intel 3160 internal wifi cards.
In a heavily congested WIFI environment all these machines will regularly lose their associations with an ASUS RT-AC68U 802.11AC AP whether running ubuntu 14.04 or debian 8. The AP is 5 feet away.
I have upgraded the 3160 /lib/firmware to the latest available on the Intel website.
The association will generally be lost within 1 to 10 minutes. The behavior is very repeatable.
I have removed all networking tools except for wicd. However, the same behavior is observed using network manager.
If I plug in an rtl8812au based 802.11ac dongle the connection in identical situations lasts forever.
logfile around the problem time:
*** OpenVPN is often the first to notice the link is down
2015-05-11T12:30:07.105004-07:00 s55t ovpn-hitnet[9781]: TLS Error: TLS handshake failed
2015-05-11T12:30:07.105174-07:00 s55t ovpn-hitnet[9781]: SIGUSR1[soft,tls-error] received, process restarting
*** This always follows the failure reported by OpenVPN
2015-05-11T12:30:07.233906-07:00 s55t kernel: [30897.194045] cfg80211: Calling CRDA to update world regulatory domain
2015-05-11T12:30:07.233918-07:00 s55t kernel: [30897.195689] cfg80211: World regulatory domain updated:
2015-05-11T12:30:07.233918-07:00 s55t kernel: [30897.195691] cfg80211: DFS Master region: unset
[Code]....
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May 27, 2009
ok so the router works in windows and i know the config details of it.i can see other wifi access points in the area but not my one. i have tried joining it as a "hidden network" to no avail.is there any reason why fedora would not detect my own wifi when it detects substantially weaker signals instead??
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Oct 19, 2010
i installed ubuntu 10.10 now im not getting wifi connections and bluetooth also not working
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Aug 7, 2011
I saved the file when I was at my hotel as a .doc file, and it had 7 or 8 pages written. I forget the file size. I'm here at the airport now, and as I load this file up to work on it, it says it's 0 bytes. What the hell happened? I'm freaking out because I *need* those notes to write my paper. I didn't really make a dent but it was still a good amount of progress! Does the file not opening have to do with switching wifi connections?
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May 8, 2010
I installed the bleeding edge drivers using a guide I was referred to from the wiki, when I was having intermittent wifi connections. It worked well for about two days, but now it's just as intermittent as before, and it works just fine in OSX and on other machines, so I'm thinking I need to change the driver.
How do I go about installing another driver? Which ones have you had luck with for a MacBook Pro Santa Rosa 3,1 running lucid under 64 bits?
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Feb 5, 2011
I've been searching for a couple of hours and have not found any threads that solve my situation... hope I'm not repeating something here.
Setup: Notebook with openSUSE 11.2 using KDE 4. Using Network Manager to manage network connection (although I've tried configuring this using ifup as well with no luck).
I need to be able to connect to client networks via a network cable (Ethernet) and connect to the internet via my MiFi 2200 Mobile WiFi. Both cards/connections are active with the following:
I have no problem mounting drives from the client's network. But, can not reach the internet. If I disconnect the ethernet cable, the browser will immediately connect to the internet and load web pages.
I'm assuming the ethernet connection is taking precedence over the wireless connection?
I can't imagine that there is not a way to set this up. If Windows can do it, I'm sure openSUSE can!
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Feb 7, 2011
have a problem with my network-manager in ubuntu 10.10.when I dial one of my vpn connections, my other vpn connections be disabled and I can't use them!I tried to restart network-manager and gnome-panel, but it does't seem to solve this problem.
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Jan 4, 2010
I'm using Ubuntu 9.04 64 bit on an Asus laptop and the wireless connection disconnects randomly for a while and keeps searching for the signal. When it finds it I have to put in my WEP key again to get it to connect sometimes only once or sometimes 2 or 3 times. This is getting quite annoying.
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Feb 17, 2010
This is weird. I will be working on the internet with several tabs open and all of a sudden the pages won't update. I can't go anywhere - it's like I lost the connection. I am also downloading bittorrents with uTorrent running with WIne and that doesn't seem to be affected. I also have gPodder and I tried to update podcasts with that and it also hangs up as if it can't connect. The only way I have been able to solve this has been to reboot (which I just did).
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Feb 25, 2010
Having major wireless issues with Linux. I have DSL and had a Westell router/modem combo and my wireless would stay up for no more than 15 mins at a time even while idle, and in order to get wireless back I have to reboot and then I can get another 5-15 mins of wireless before it drops. When it drops it prompts me for my wep key and wont accept it yet if I reboot it catches the wireless right away for a very short period. So I go out today and spend over $100 bucks on a Netgear dgn2000 thinking it would fix the problem... Nope I am still in the same boat as I was with the Westell.
I am not seeing my router model listed under the wiki link sticky.. (Edit) thought I installed ndiswrapper, it was it was in my downloads anyway I can't install it I get the following error (Not a valid driver .inf file.)I have tried 3 distros and have the same problem. I went to Netgears site in search of Linux drivers but all I found was the firmware updates. Could some one please shed some light on what I need to do to get up and running?This is a new laptop and I am pretty annoyed with myself for formatting it out of the box rather than reading up a bit more about Linux (been using for one month).I don't understand it Ubuntu 10.9 ran wireless perfect on my older system, (full install) and I have no trouble with my lap top that is running Windows.I really hope to get this resolved I really enjoy Linux and I don't want this to be the one handicap which would force me back to Windows, that would be very upsetting
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May 10, 2010
Lately I have been using my window's partition due to the fact that 10.04 drops my wireless signal every 5-10 minutes, but today I downloaded the new updates and that seems to have fix the issue with the dropping of the wireless connection. Now the only problem is the internet is so slow when trying to go to webpages it times out. I have opened up firefox gone to about:config and changed the necessary lines, but still dreadfully slow.
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Sep 6, 2010
get this working all of the time instead of the constant dropping that I experience -- i've read a lot of the posts and think i have the right driver installed but there never seems to be a major improvement.Running a p4 2.8 ghz system on lucid and have the most recent kernel installed.Thought I'd give it a last attempt with help before chucking it and getting an adapter that's more compatible
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