Ubuntu Networking :: Ethernet Connection Suddenly Slow - Dns Problem / Troubleshoot This?
Apr 1, 2011
A couple of days ago my internet connections suddenly became very slow/intermittant.
I thought the problem was at my DSL provider but after more checking the problem seems to be in Ubuntu/Linux somewhere.
Reason: I can dual boot with windows 7 and have no ptoblem at all. Also I tried a Ubuntu laptop on the same router ethernet port and it also works fine. So its not my hardware or my provider, and its not a general Ubuntu problem either.
There are no error messages in any of the /var/log files and ifconfig looks normal.
It seems to be a DNS problem as it's the initial connection to a host which often times out. If I get a connection, I can e.g. stream an radio station fine.
If I try to e.g. traceroute any host it times out (no reply).
Ubuntu 10.10 is totally up to date as of today.
I'm stuck! How can I troubleshoot this to find the cause?
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Jun 16, 2011
I installed Fedora today, and I automatically had internet connection, I never had do configure anything myself. Then, I was playing around with VPN for a good while (trying to set up the VPN connection to my University), and now, I suddenly lost my connection to the internet!
But only Fedora can't connect anymore, the Windows PC has connection as well as my Mac OS X (I dualboot Linux on my MacBook). The Ethernet connection works as well, when I unplug the cable, Fedora gives me a message, but I just don't get into the internet!
Does anyone have an ides what I have to do? I don't know anything about network connections and I'm new to Linux...
I already restarted the Computer, but that didn't work, and Google didn't really held either.
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Jul 9, 2011
the title says I have painfully slow(connection times out when loading google) ethernet connection on my new pc. This comp had similar problems with the OEM windows 7 install but now it's strictly a linux box so I'm anxious to get it fixed.
I'm running Ubuntu 10.04 and Slackware 13.37, and have wireless working on Ubuntu but haven't set it up on Slack yet. The only thing I've done so far is try to change speed and duplex using ethtool but it didn't work, the settings stayed the same. I'm writing from another comp so I'll do my best to post any info you request but I'll have to use a flash drive lol
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Aug 12, 2010
Version: Ubuntu 10.04 Relavant hardware: P5QL Pro built-in ethernet, cable modem with linksys wireless-G router (although problem is with ethernet connection, not wireless)
One minute my ethernet was working, and the next it stopped working. The only thing that I did between it working and not working was install electricsheep from Synaptic and then I shut down the computer. When I restarted a bit later, no ethernet connection shows up.
I checked the cables, made sure they are in tight.
My laptop connects using the same ethernet cable fine. So its not the cable or the router.
I reset the router and the computer at the same time. Still doesn't work.
I don't know where to even start with troubleshooting this sort of problem. Everything to the extent of my computer knowledge seems to be working fine.
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Jan 11, 2010
My Kubuntu installation (9.10) boots up normally and seems to run fine, other than it is very slow to respond to inputs or change screens/ applications etc. It can take 5-10 seconds to respond to simple requests like changing from firefox to dolphin by clicking in the taskbar. It is dual boot with XP, which also seems sluggish, but is bearable.
The computer is barely useable in Kubuntu because of the slow response. I had 9.04 installed before, same problem. I tried searching for drivers for the on board video, thinking that might be it, but came up empty.
[Code]...
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Apr 1, 2011
Yesterday it was everything OK in my PC with Ubutnu 10.4 and WinXP. Suddenly Ethernet stop working at Ubuntu, all what happened in between was a change of user, I trying changin user again, restarting PC, switching the cable (I have two ethernet boards) and nothing happened. It is like a virus attack, I don't know. I am writing now from WinXP in the same computer. Ubuntu says that I have no cable connected, but as you can see I am connected in Windows
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Jul 26, 2009
I just installed a fresh copy of Fedora 11 x64 on my Dell XPS M1530. Last week I purchased a NAS device and backed up my entire Fedora 9 x86 system on it. I have an NFS mount that I'm restoring my data from.
The first thing I noticed after installing is that downloading of very large files (several MB to several GB) over my wired network is extremely slow. What I'm seeing is that it will download 3 - 5MB then pause for several seconds and download another few MB and so on. If I download a lot of small files from the NAS device it works fine and very fast. If I upload large files to the NAS they upload fast. If I boot into Vista and download large files from the NAS it is fast. If I use my wifi card to download large files from the NAS it downloads OK (not too fast but it is wifi so naturally slower).
In Fedora 9 I did not have this issue. I'm not sure if the issue is specific to NFS or if it is will all large files via the ethernet port (I don't have a way to test at the moment). lspci says 09:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8040 PCI-E Fast Ethernet Controller (rev 12). dmesg doesn't indicate any issues.
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Jul 4, 2010
I installed Ubuntu 10.4 side by side with my Vista. This is on a PC I leave on permanently and use as a sort of Sever, so Security and Network connection are VERY important on this device. I use it for documents and IP PBX (telephone system). I currently use Vista and 3CX, but I plan to roll it over to Unbuntu full time once its up and runnng correctly - I will just need to change the Grub2 conf priority. After install, all was fine and I managed to make many changes to settings, apps and updates, but I have noticed in the past week when going in to make further changes the network has suddenly stopped working! According to Network Manager and the icon on the panel it is connected and I can not see anything obvious that is not correct. I tried doing a PING (192.168.1.1) from Network Manager to the main router, but it failed. I know that there is nothing wrong with the network nor the card or PC it all sits on. It's working now with Vista and my other machines. It must be a config some-where.
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Jun 14, 2011
F15_x64, upgraded from F14 on Sandy Bridge. Any idea how to troubleshoot this slow loading service?
Code:
[root@sandy andy]# systemd-analyze blame
4598ms udev-settle.service
1611ms fedora-wait-storage.service
Code:
[root@sandy andy]# systemd-analyze
Startup finished in 2024ms (kernel) + 1527ms (initrd) + 11217ms (userspace) = 14770ms
[root@sandy andy]#
[Code]...
I've tried systemctl disable udev-settle.service, but it doesn't work, service loads on every boot.
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Mar 5, 2011
All of a sudden without rhyme or reason, My Lucid Lynx install stopped connecting to my network. This was without any intervention from me as I did not modify install or change anything prior to this happening.
What I have gathered so far is that upon initial boot eth0 seems to always be disabled. So I ifconfig eth0 up to bring it back online. All the settings in the network applet seem to be intact for my manual network that has DHCP disabled. Let me re-iterate that these settings worked fine for months then all of a sudden something went belly up. The same machine will connect fine with the same settings from within Win7.
ifconfig command shows both eth0 and the loopback interface but eth0 never manages to secure the 192.168.1.3 address that it should have. ping 192.168.1.1 returns "Network unreachable" so it appears the connection is being cut off at the machine and not the router. I did check to make sure the connection was even recognized and it sees the wired connection going to the router, but nothing else.
/etc/network/interfaces only shows two lines regarding the loopback interface and nothing else; eth0 seems non-existant within this file which I find odd.
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Feb 14, 2010
I am using UBUNTU 9.04 on a HP mini notebook. I pratically never had problem connecting wireless with my netbook, expecially with this connection at home. Until yesterday. There were some line problems, that have been solved after some hours. Then I was able again to connect.
I didnt do nothing on the netbook. After 2 hours, connection gone. Now, even if other laptops are wonderfully connected (to the same line), mine has a dramatically slow connection (in the sense that is able to open just the first page of google if I am lucky) or no connection at all (even if the signal looks good on the network panel.
I tryed the help for wireless troubleshooting, checked for device recognition. Putting in terminal sudo lshw -C network Says disabled. But the device of the wireless on my pc is on, and it's also enabled in its panel.
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Dec 10, 2010
My laptop has been working fine with ubuntu 10.04, and earlier today it shut down after running out of battery. I came to use itr and discovered that the wifi icon had disappeared from the panel bar, and it won't connect to the wireless networkor via a wired connection.I have had a play around with this, tried ping -c5 google.comresult was:ping: unknown host google.comand ping -c5 4.2.2.1result: onnect:etwork is unreachable.I have other computers connecting to this network and know that it is working fine.
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Apr 4, 2010
how to use a ethernet conenction(Marvell Yukon 88E8039 PCI-E Fast Ethernet Controller )in ubuntu...my internet requires user name and password ..can u even tell me how to config the user name and password
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May 11, 2010
I installed 10.04 today, and I can't get any connection through the LAN. I've tried some stuff on my own, but I've been unsuccessful so far. It's not a hardware or connection issue, as it works perfectly fine in Windows 7. I haven't had this issue in any previous version of Ubuntu (or any Linux distro for that matter).The weirdest part is I booted from the installation CD as as LiveCD, and everything worked perfectly fine. It only stops working after I actually install it. Here's the results of ifconfig:
eth0 Link encap:Ethernet HWaddr 00:17:31:d8:d5:76
inet6 addr: fe80::217:31ff:fed8:d576/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
[code]....
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May 21, 2011
I have just installed ubuntu 10.10 on an Acer Aspire 3610 notebook. 2 GB RAM. This notebook had Internet access previously via Windows XP (now erased). Here is the partitioned drive. Two ext4 partitions for ubuntu "/" and "/home". Two ntfs partitions possibly for Windows. I have booted up the fresh installation of ubuntu 10.10. I had some glitch where I saw "Operating system not found' on booting from HDD and I wondered if this was due to failing drive.
But I've run a full test using Disk Utility and it shows as healthy. This message has gone away (I don't know why) and I can boot into ubuntu. The problem I'm trying to solve is simply no internet connection. Here are some outputs from commands ..
[Code]....
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Feb 13, 2010
i shut down my ubuntu karmic for a bit. turned it back on after an hour or so and now i have no network connection. i checked all the obvious things like cords etc wife's computer is connected through the same router / modem and no probs here.i even replaced the card in mine.
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May 3, 2010
I just upgraded to 10.04. I had wireless connection for 1 day and now nothing. No ethernet connection either. I CAN use both wireless and ethernet using my machine on Windows.....so the connection stuff does work. Here's the output of of the commands I got from the "sticky". I can't display the output as this forum puts it all together as one continuous sentence with no line break!
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Jun 6, 2010
I'm trying to set up a shared Internet connection that had been broken by a previous update, I believe. Eth0 is connected to the Internet, whereas eth2 should be the connection going to my Roku set-top box. Under the nm-applet icon, an entry exists for "Auto eth0" for the first card, but there is nothing under the second card except "disconnected". How do I make a connection entry under my eth2 card so that I can share my Internet connection with my Roku box?
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Jul 27, 2011
When I start my Ubuntu machine, it says "eth0 connection established". But i could not able to ping to other machines available in LAN & also to Internet.
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Jul 23, 2010
i've just got a new broadband/wireless connection from Virgin Media and am trying to get this very old laptop online. in the past, cable connections have been easy, and wireless has given issues, but this time its the opposite. so, i have a new cable connection that is all plugged in. called customer support, they have no support for linux as usual, but they 'manually activated' the modem and thats all they can do. i am not trying to setup the wireless network yet, i'll do that with a pc later, for now i just want to plug in and go. on Network Settings, i have set the wired connection to dhcp. thats what i've done before ... not sure if i need to get static addresses from the ISP? i can go online now using the erratic but generous neighborhood free wireless.
ifconfig -a gives:
Code:
ath0 Link encap:Ethernet HWaddr 00:14:A4:1E:3E:65
inet addr:192.168.1.66 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::214:a4ff:fe1e:3e65/64 Scope:Link
[code]....
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May 7, 2010
Following upgrading my 09.04 partition to 09.10 then 10.04, all was working fine until I tried hibernate out for the first time - big mistake! If I can get to a position where i can log on to the system, I find that my ethernet network connection is disabled and I cannot get it to restart. My 09.10 system still works ok. I am tempted to do a clean install of 10.04, even though I'll have to spend some time reloading the extra's and re-configuring.
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Jun 17, 2010
I just installed 10.04 on my new netbook and I am suprised to see that the ethernet is not recognized. When I run
Code:
ifconfig eth0
the result is
Code:
no such device
The machine was working fine before I installed Ubuntu. I am suprised to see this problem as I have already installed it on a few machines without any problem such as this.
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Jul 24, 2010
I have a HP Mini running Ubuntu Desktop 10.04, and I cannot get a wired connection to work. My network card is "Broadcom Corporation BCM4312 802.11b/g (rev 01)", and I have the restricted drivers for the card installed. Wireless works fine, though.
My /etc/network/interfaces:
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Sep 21, 2010
I am trying to run a cable from my wireless router over a 75ft cat6 cable to my bedroom. I don't get any connection on my end and I don't have any other ideas. I did setup a m0n0wall box just to try. I got the network led on my server to light up in my room but nothing more than that. Lastly, I tried adding a 5 port switch in my room and then connecting that to my server and nada.
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Aug 5, 2011
After some fiddling around, I have come to the conclusion my current wifi access point hates my other computer's Broadcom chip or the drivers thereof. So, my current idea is as follows. I would like to use my netbook to connect to the wireless network, and then connect my other computer to it through ethernet. My netbook is dual boot XP and Ubuntu (think Ubuntu is a version behind) and I would be fine to set up this sharing in either and just leave it on as a repeater station. My other computer is dual boot XP and Fedora and I would prefer this work to allow me to have network in both. I have a straight-through cable and have verified that my network card supports the automatic crossing over behavior.
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Mar 5, 2010
I want to connect my pc to my laptop. I have fedora 12 installed in both system.How can I do this?
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Nov 2, 2009
My program is working. However, I would like to add in some features. Let see my code first
Code:
if (returnresult<=0)
{
printf("Connecting....
");
[code]....
When the ethernet network connected, it will go into the else loop at line no. 13. The system will send status and display the status at control panel screen. If at this point, the ethernet disconnected, it will go back to the if loop at line 1. The system will keep trying to connect to the network and keep loop the if loop until it is connected.
Question now is I need the system to test the connection too after going into the operation loop that is start from the line no. 47. If the system went into the for (int c=0;c<cCOL;c++), it will need to do all the operations as indicated by cCOL times before it exit that loop and go into the previous loop.
I need the system to detect connection everytime an operation is going to happen or ended and if there is no connection, it will trying to connect. Before it is connected, it will not continue the operations. I tried to put the function "Connect (szPort, szAddress)" into each loop. Yes, the operation stop everytime the network disconnected. However, it shows on control panel screen "New Connection...." everytime it execute the statement. In fact, the network never disconnected.
I tried to look at the Connect function code, it is as below, I cannot figure out any statement that can stop the appearance of that "New Connection...". It may be hidden at the library source code, it is too hard for a beginner to modify the library code.
Code:
int Connect (char *szPort, char *szAddress)
{
/* Set the remote port */
int port; /* port number */
[code]....
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Mar 6, 2011
OS: Linux Mint 10 | Windows 7 Install Type: WUBI inside windows 7 Computer: HP Compaq Presario CQ56' Network: Realtek PCIe FE Family controller w/ Realtek 8102E chipset Problem in: Network Connection Issue: After I woke up my computer from Sleep, I lost ethernet. No connection. It told me that I had lost my connection. Why? Now, after several restarts, nothing.
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Jul 30, 2009
I have a Sun server that could be only configured via serial interface. It has one serial port with a RJ 45 connector. Although my laptop has not serial interface. Is there a way to use C-Kermit or any software to establish a serial connection via the ethernet port. It should be some kind of virtual serial port that should transmit the information over the ethernet port, without encapsulating it in ethernet frames.
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Jun 15, 2010
it is possible to tap off your phone lines with ethernet connectors. As an example. I take a phone jack in the bedroom, I splice off the line of the phone and insert an RJ45 connector along with the phone connector. Hopefully the line will be 4 wire. I can't imagine it would work with only 2 wire. I don't know for sure. Would that work?
My thoughts are the problems with the entire phone line connections. I know the phone line runs out of the house. Would it not work because of that when I attach a switch to it? If anyone has accomplished this or tried to, I would like to know. I'm guessing that the house would have to be pre-wired with CAT-5 because of collisions that can occur.
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