Ubuntu Networking :: Network Connections Keep Dropping?
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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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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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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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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Jul 7, 2011
My network seems to be dropping every few minutes to few hours. There are a lot of networks in the area (apartment in NYC) and I wonder if it might be due to competing traffic. Any ideas for how to tell what channels other networks are on? or other modifications to router settings that might improve performance in this situation?Additionally the "Invalid Misc" in iwconfig is counting quite quickly.
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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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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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Feb 20, 2010
I have a windows installation (partition) but have installed into freespace on the same drive using the auto-partition manager, etc, and everything is fine. I got my network going fairly easily by going Preferences > Wireless and inputting SSID and WPA encryption key (PSK). My router issues an WLAN IP, I can get on the net, I can see my other Windows PCs on the network, I can reach my router, and all is good.So after several hours of mooching about and looking at things, I have updated all the Linux packages via Synaptics (following a prompt to update everything) including GRUB. My dual boot now shows two versions of the OS:
GRUB 1.7~Beta4
Ubuntu, Linux 2.6.31-19 - generic (I am booting this one)
Ubuntu, Linux 2.6.31-14 - generic
I also set up my HP F4580 printer over wifi on the network though with slightly incorrect drivers (for the F4400 series as this was recommended at the closest match). It works, and I can print a test page no problem.The only thing is that now (since doing all that) Ubuntu seems to periodically drop my connection to the network and then request the network PSK again, but when I enter it, it spends time trying to renegotiate but fails, and then re-requests the PSK, over and over and it never reconnects. I have to reboot and then I can connect again (automatically), until it drops at some random point (like 5 or 10 mins later)
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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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Apr 13, 2011
Within the last couple of days or so, my wireless has been on the fritz. It keeps disconnecting and reconnecting every minute or so, which is annoying to say the least. The information relating to my wireless network is:
Laptop model: Toshiba Satellite L350
Wireless interface: Atheros AR5001 Wireless Network Adapter
Interface:
[code]...
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May 31, 2010
I'm working with a Ubuntu 10.04 LTS system with two network interfaces (both Ethernet). I wish to setup this system such that it is simultaneously connected to my local and an OpenVPN network and able direct traffic between the connections depending on what program is sending the traffic. The problem: Under my current OpenVPN configuration all network traffic is directed to the VPN.
My OpenVPN config file (some details omitted)
--remote [gateway ip] # vpn12 load:
--remote [gateway ip] # vpn11 load:
--remote [gateway ip] # vpn15 load:
--remote [gateway ip] # vpn16 load:
[code]....
In practice, I would like OpenVPN to operate out of one of my two network interfaces and leave the other interface connected to the local network. Then by default all network traffic should be directed to my local network unless I specify (on a per program bases) that certain traffic should go though the VPN. These two network connections can (should) stay completely independent of each other and do not need to talk to each other.
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Aug 23, 2010
Neither of my wired network connections are listed in the network manager applet. I know that networking seems to be functional since I can ping local devices on the network. I can't resolve DNS names however. I suppose this is because network manager usually handles DNS? I've posted the outputs of various configurations below.
Code:
/etc/NetworkManager/nm-system-settings.cfg
# This file is installed into /etc/NetworkManager, and is loaded by
# NetworkManager by default. To override, specify: '--config file'
# during NM startup. This can be done by appending to DAEMON_OPTS in
[code]....
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May 30, 2011
I recently installed Fedora 15 now, and during installation I set the internet connection manually, then did update and after reboot, the internet connection settings have been removed. Now I can not set because the network connection to the Internet Connection is inactive. I mention that before the update was functional internet connection.
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Jul 8, 2011
i've installed ubuntu 11.04 on a friends Asus Eee pc 1005HA netbook. after the installation i tried to connect to the router using wireless, and when i enter the key, it fails to connect, so i tried using an Ethernet cable to connect but that doesn't work either,the network devices on the computer are:
Atheros AR8132 PCI-e fast ethernet controller
Atheros AR 9285 wireless network adapter
It lists the wireless device and the solutions to the problem, however, the solutions seem to be for Ubuntu 10.04 and also 10.10, and im not sure if it will work for 11.04 so far i have been unable to find out anything on the forums about the ethernet
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Jun 18, 2009
once I updated , there will be no connections to Internet in GUI , while it's available in TUI . So it's wired , huh ? Before upating, it's available both in TUI and GUI, though all the time the network-manager shows no connection , in fact , there is and both GUI and CUI . Now I updated , and it can't access Internet from GUI.
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Mar 17, 2010
Is there a way to log specific type of network connection with timestamp? I mean, if someone sends a mail through mail server, is there a way the server logs that connection with timestamp?
Example:
2010-03-17 14:10:12 <server>:25 <client1>:<port1>
2010-03-17 14:10:26 <server>:25 <client2>:<port2>
2010-03-17 14:13:09 <server>:25 <client3>:<port3>
2010-03-17 14:15:43 <server>:25 <client4>:<port4>
...
...
...
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Oct 29, 2010
I'm having trouble running 2 network connections on an Ubuntu 10.10 machine. My wireless connection provides my internet access and is assigned the ip 192.168.1.7 My ethernet connection provides access to a separate network containing a nas box/server. The ip address for this is 192.168.5.100 When I am only connected to the wireless network, the internet works fine. However, once I connect to the ethernet network, I lose internet access via browsers and email client I cannot ping external web servers. It doesn't appear to be an ip address conflict so I'm at a loss as to what is causing my internet connection to drop.
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Sep 20, 2010
I am total newby in Ubuntu 10.04. I have just installed it in my office where I have two networks card one connect to a router giving the internet access and the other connected to the windows based work network providing access to the work network sources. In XP everything works fine as I can keep both connections alive and have the results I want.
However although I don't know how to do it in Ubuntu 10.04. Till now I have setup the first connection directly to my router and I have internet access but I cannot set the other one. Another question is how I can force ubuntu to use the router connection as the default one when I log in.
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Jan 24, 2011
Since I installed ubuntu 10.04 I dont see my eth0 card in System->Preferences->Network _connections. Everything works fine but it puzzles me. In ifconfig iI just see the eth0, networking seems to be working fine, but it keeps puzzling me. Adding theinterface is no solution: add it and it doesnt show again
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Jun 14, 2011
Using xubuntu 11.04, how do I maually give myself a static IP address and other IPv4 settings? I see the edit connections panel and saved a setting there but can't see how to use that setting. The only useable setting when I'm connected by ethernet is Auto eth0.
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Jul 4, 2011
i'm currently using ubuntu 10.04 and wanted to update to 11.04 and that means backing up all sorts of data and configuration.Regarding the wireless configuration list, i have a few with password and auto connect, i wanted to know if there is a way of saving that listconfiguration other then manually.
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Dec 18, 2010
I have just installed Ubuntu 10.10 64bit on my laptop Toshiba Satellite A665-S6065 and I can connect to wired network but I can not connect to wireless network "Network Connections disconnected". Im following this post http://ubuntuforums.org/showthread.php?p=6183681
1. Machine Brand and Model (PC/Laptop): Toshiba Satellite A665-S6065
2. Wireless Brand, Model and Wireless Chipset:
Code:
lspci
Output:
Code:
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
[Code]...
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Dec 20, 2010
How to check Linux server network connections generally?
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Apr 4, 2010
All connections on my computer start loading and then hang: it happens when running apt-get update (a few repositories load successfully and then it hangs at a random one) and when loading web pages with the browser (it says "Connecting...", then "Waiting for....", sometimes some part of the page loads, and then it hangs).
This happens both with my wired and my wireless connection. It does not happen on Windows on the same computer.
Any idea on what it might be?
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Feb 11, 2011
I messed up my Network Connections when I put a different NIC in my computer. Now I just went back to using the old NIC. It shows up in ifconfig, but the GUI Network Connections is blank. When I manually Add the connection back to the GUI Network Connections, the settings are not reflected when doing ifconfig.For example, I change the IP address for eth0 in GUI Network Connections, save the settings,
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Feb 25, 2011
I have a bunch of Ubuntu boxes on one subnet, 192.168.1.0. I have a Windows 7 box on another subnet, 192.168.2.0. I am able to ping and SSH to all servers on the .1 subnet except for one server, which I will call PITA. I will attempt to SSH to PITA, and it won't respond, nor does it respond to pings. I will the SSH to PITA from another of the test servers, successfully connect, and then when I SSH from my Windows 7 machine I can connect successfully. If I first connect via console to PITA and send some pings out (to anywhere, like 4.2.2.2), I can also connect from my Windows 7 machine. I've never seen anything like this.
One of the weird things is that I used PITA to create an image that I then used to create many of the other test servers, and they work fine, so I'm not sure what the problem is. I've checked /var/log/messages and syslog and there's nothing in them that indicates a problem. I've rebooted this server, restarted SSH, changed the IP in case it was conflicting with something else, forced an ARP update in case it was cached (since I had bonded the interfaces), cleared the ARP cache on my own machine, verified Network Manager is not installed...and I still have this issue.
Here are some network-related config:
/etc/network/interfaces
Quote:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
[code]....
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Jul 30, 2011
I am running Ubuntu 9.04 as a partition with windows 7 on a acer aspire 5742, I would like to connect to the internet in Ubuntu, wirelessly, but I am unable to turn my wireless on in Ubuntu, and network manager says "no network connections available". I have the following network adapters:
Atheros AR5B97 Wireless Network Adapter
Broadcom NetLink (TM) Gigabit Ethernet
Microsoft Virtual WiFi Miniport Adapter
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Feb 11, 2009
Code:
[bee@localhost ~]$ ulimit -a | grep files
open files (-n) 1024
that open files value set to 1024, but is it valid only for real files ("file handles/descriptors" of files on your filesystems: hd partitions / cdrom / floppy / usb devices) or does it counts also network/sockets connections? i'm just asking without a reason. it's just curiosity ... as you can see sockets with lsof, somebody like me could think connections are counted as they were "files" by ulimit too
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Aug 8, 2009
I want to write a custom rule to allow all connections to the ip addresses on my local network (192.168.2.2 through ...99) but I don't know how. I know adding a custom rule asks me to read a file and put it in "iptables" format, but I don't know how...
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