Networking :: Major Failure On Part Of Ubuntu Related To Networking / Fix It?
Mar 31, 2010
After deleting part of the gnome config directories in order to reset gnome (GUI was messed up - No title bars, etc). I lost my bluetooth tethering to my Nokia N900. I cannot redo it as it always fails. Linking from phone to Laptop works, but cannot use it to link up to the internet then. Cable to the phone always worked up till now. Now I cannot get a connection as it stopped working after my upgrade to 11.04.
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Feb 9, 2010
what are the major differences in statice IP configuration vs DHCP
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Jul 26, 2010
There is a major problem - networking does not work at all for me in this setup with the new kernel.I use Debian distro on this notebook.I don't have previous experience with submitting a kernel bug and would like to learn how to do it to be able to help the community. There is a tool called reportbug in debian, but it is too much automated, I think - it automatically fills in the kernel version I booted to right now, but I need to report bug to different kernel version, in which networking does not work
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Apr 16, 2011
I've seen packets coming to my computer through a DD-WRTv24s2 gateway above port 32K several times. I have iptables (using fwbuilder locally) both places. My desktop stops the packets. But I'm guessing the problem is as I described in the title for this post. Yes?If you ESTABLISH a connection to some webpage, and you just accept ESTABLISHED or RELATED datagrams in rule 1 of your iptables, what will keep incoming TCP from that (presumably nefarious) site from going straight to your desktop like the building firewall isn't there?? If the site wants to connect to you above 32k, or portscan you, its RELATED correct? They know your IP. You've ESTABLISHED a connection.If my guess is correct, it would seem wiser to NEVER use these together. Better to ACCEPT all ESTABLISHED. And if something is RELATED, then ACCEPT it only if its the data connection on FTP or individually by service or protocol.
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Nov 22, 2010
Trying to debug a network issue - we have problems with scp transfers to a remote host intermittently stalling. I believe it may have something to do with incorrect handling of sack / dsack TCP options. Looking at netstat -s, during a (successful) scp transfer the TCPSACKDiscard and TCPDSACKIgnoredNoUndo counters increase rapidly. This is on the client initiating the transfer to the remote server. This doesn't seem normal, but I'm having difficulty finding an explanation of what exactly these counters signify. The tcp_sack / tcp_dsack / tcp_fack options are enabled in the kernel on both hosts.
How do I debug this further? Are the counters a symptom of a known problem? It's kind of hard to google this, all I get is unrelated netstat output which happens to include 1 or 2 discarded SACKs, not tens of thousands like I am seeing. I can make tcpdumps on the client (unfortunately not the server), but what should I look for?
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Mar 29, 2010
Brand new network, just installed, all ubuntu 9.10 boxes connected to a Dell 2206 dumb gigabit switch, and from there to Dlink router to cable modem. Pretty simple. ISP confirms great link out and inbound,
However, http requests can sit for 20-30 seconds (sometimes longer), before content returns, same for pings.
Some thought it might be MTU-related. What is best MTU setting 1500/1492/ ?
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Feb 18, 2009
I've only used Linux for about a year or two now and have worked through suspend esume and WPA wireless issues with CentOS and my T61p. However, I'm stumped on this one. why my T61p freezes randomly (happened once while writing this topic) with the caps lock light blinking. I'm wondering if it has something to do with my nVidia driversettings andor using my wireless card and/or switching between home wwireless and work wwired connection.
[Code]...
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Feb 1, 2011
I'm trying to connect to Ipredator. If I plug my laptop into the wired network in one part of my house, I am able to connect to the VPN. If I connect to the wifi in another part of the house, network manager fails to connect to Ipredator. I have a wall-plugged wireless range extender, Netgear WGX102, connected to the wired network in the part of the house where Ipredator works, and it is providing the wireless access point in the part of the house where Ipredator does not work.
I checked the Netgear website and they don't seem to have any newer firmware for it. I've tried everything I can think of in terms of changing settings in the wireless range extender. Am I doing something wrong, and if so, what? If the problem is with the wireless range extender, then what can I get to replace it?
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Apr 7, 2010
I am trying to set up a free wireless network for clients for a small business. I have a wireless router that I plan on hooking up to our main router. I want to keep all the computers that are associated with the wireless router from being able to access the rest of the network hooked up to our main router. I think one solution might be to put the wireless router in a DMZ. I think this should isolate it from the rest of the network (and have a side-effect of sending outside traffic to the wireless router, which shouldn't matter). Will this work? Also, if I just make both routers have the same subnet (e.g. 192.168.1.x), will my wireless router just filter out requests for computers on our main network as requests for (non-existent) computers on its local network? Any other ideas are welcome.
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Nov 5, 2010
Basically I am looking to short-cut the whole learning curve thing and just buy the adapter that I need! What I need is for someone / what usb wireless-n adapter that DOES work with very little effort on my part!
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Jul 12, 2010
I have tested it in windows and confirmed that the problem does not lay in the firewall and is just in ubuntu.
Simply what happens is I can connect, or rather network manager tells me im connected. If I leave it for approx 30 seconds it will fail.
If I open terminal services client it will allow me to connect to the server and even get passed the login screen but will just simply fail and the TSC program will crash.
below are a list of forums and fixes I have attempted. I am beginning to think that the open VPN program supplied with ubuntu is completely inadiquate (based on the number of other people with problems) and I cannot see why ubuntu comes shipped with it on CD when it clearly undermines the good work they have done to produce the rest of the OS.
[URL]
Anyway, I have tried using MPPE, refuse-eap = yes
I have tried changing EVERY single option available in the VPN properties and restarting the network after each one.
As an alternative are there any other network managers available for ubuntu 10 that anyone can recommend to avoid using the standard one?
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Jan 28, 2011
I use a free vpn connection service to avoid filtering in Windows xp but in my ubuntu 10.10 is not working , i checked the gateway and other properties a lot of time and there is nothing wrong.
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Dec 14, 2009
lost my internet connection on fedora 12 ? i try to assaing the ip address manual in the configruation part but no nothing happen I've tried googling for the problem
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Jul 12, 2010
I got a netbook, used, and I installed Ubuntu Netbook Remix on it. This is my netbook :
Quote:
Product Number VA715UA#ABA
Microprocessor 1.60GHz Intel Atom Processor N270
Microprocessor Cache 512KB L2
Memory 1024MB DDR2 System Memory (1 Dimm)
Memory Max 1024MB
[Code].....
I was fine to get on the internet when it had Vista on it, but now the wifi light is always 'on' no matter what I do, yet Ubuntu can't even acknowledge it HAS wifi, let alone connects. I'm at a total loss here, and I need this up and running.
I've found a lot of people with similar issues, but none of those solutions has helped. My Ubuntu 'fails' packages all the time (tells me they don't exist!) and I don't know what to do with it. I'm a Windows user (born and raised) and speaking Ubuntu is not coming naturally to me.
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Aug 16, 2010
I have an IBM Thinkpad running Ubuntu 9.04. I just went on a trip and used the hotels wireless internet with no problems. I get back to my own wireless network and not one wireless connection comes up. My other computers get the signal just fine. I have rebooted the computer as well as tried an Ubuntu Live Cd to see if it was just my settings. Nothing is working and it can't find the networks. Does this mean that my card is dead because it was just working a few days ago...?
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Mar 14, 2010
I just installed that latest version of Ubuntu on to my HP *a6750f Pavilion PC. I am using my wireless card on it. When i use the internet sometimes it will work for awhile but then it won't. So my internet keeps cutting in and out. I am not being diconnected from my router though. Internet is working prefectly fine on my other computers running windows seven and ubuntu.Here is my information
------------lspci code returned
00:00.0 Host bridge: Advanced Micro Devices [AMD] RS780 Host Bridge
00:01.0 PCI bridge: Hewlett-Packard Company Device 9602
[code]....
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Dec 18, 2010
I was connecting to the internet with no problems at all until two days ago. a while back I set my local IP to #.#.#.11, the internet failed.
Code:
I removed the added code from /etc/network/interfaces and the internet started up again, however the card retained the .11 IP address and has done through many installs... Don't know why or how, probably just a router DHCP setting not retiring the IP of machines.
That wasn't a problem as far as I know.
Ok, so I check a wired connected win7 pc and an ipconfig /all shows he's got the #.#.#.11 address. Checked a wireless win7 netbook and it got a #.#.#.24 address
Wireless key double checked and is correct.
I'm now on my WinXP partition (dual boot with the same ubuntu install that won't connect to the internet) it's getting the IP #.#.#.5 and is connecting with no trouble(albeit slow windows)
All machines are set to automatic configure, but obviously retain the same ip for a while.
I've tried
Code:
iwconfig show that the wireless card is indeed wlan0
Here's basic information
Code:
Wireless card on non-connecting machine: Belkin N+ wireless card, v2001, NDISWRAPPER
will this work?:
Code:
The problem is that if I try and connect to the router it does the "connecting rotating circle" and then just either has a message "disconnected from wireless" or asks me again and again for the WPA key, which is already correct.
LiveCD and fresh install both fail, used ndiswrapper and it's always worked fine before.
using Ubuntu 10.04
How I can get connected again? This is a desktop, a wired connection is just NOT possible.
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Jan 18, 2011
I am inquiring about an error i have run into when i tried to make the driver "Ralink 2750 usb enhanced drvier". I downloaded it from this site [URL]... My wifi card according to lsusb is a 2570 Ralink Technology, Corp. 802.11g WiFi. I extract the package inside my /home/user/Downloads directory, using tar -xvf /home/user/Downloads/rt2570-k2wrlz-1.6.4.tar.bz2 That works fine and extracts the file, but once i change the working directory to /home/user/Downloads/rt2570-k2wrlz-1.6.4/Module and run the 'make' command, i receive the following error.
[code]...
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Jan 14, 2010
I am facing problem when doing NFS mount.RPC service is not getting shutdown.
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Apr 24, 2010
have Karmic Coala runing on an IBM thinkpad X.41. Works great. My home network is all ethernet so I have a router , CAT5 cable to laptop.A coupleof times I've had power outages The laptop carries on as it's on battery power. When the power comes back , the router restarts, it reconnects after a few minutes but the laptop doesn't reconnect to the network seamlessly. On some other Linux distro's I've had running /etc/init.d/network restart will refresh everything. On Ubuntu I have /etc/init.d/networks but running restart In the end I needed to reboot the laptop to get the network back on.Perhaps this is a power management issue with the laptop ethernet card i.e losing power powers down the card and it never comes back up properly.
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Aug 14, 2010
i have a problem connecting to the internet at home, but have no problem connecting to the internet in other places. My computer connect ot the router but does not receive aconnection to the internet form the router. this happens both wireless and ethernet. at the same time everybody elses computers (using windows) connect to the internet in my home. i have tried switching between two wireless cards, had the same problem. this makes me think it has something to do with the router itself. i use a Planet WRT-413 router.
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Sep 10, 2010
I'm attempting to get 10.04 to connect to an SBS 2003 pptp vpn server, but for the life of me have been unable to find or implement a working solution. System previously had 8.x and 9.x and had no difficulty connecting to same server, but on a fresh install of 10.04 cannot connect.
tail -f /var/log/syslog shows the following:
Code:
Sep 10 15:19:32 ubuntu NetworkManager: <info> Starting VPN service 'org.freedesktop.NetworkManager.pptp'...
Sep 10 15:19:32 ubuntu NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.pptp' started
[Code]....
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Feb 28, 2010
After running a system update, on next boot I was unable to connect to the internet. I am running Fedora 12 KDE 4.4 x86_64 with a dsl connection. Network manager was keeping my ethernet card disabled. If I disabled NM control of the card I could manually enable it and connect to the internet, but on reboot it would be disabled again. I saw that the update did apply to NetworkManager so I did a downgrade. yum downgrade NetworkManager That seems to have fixed the problem.
Here's an interesting thing I noticed. When I did the downgrade, yum wanted to "Install" for dep NetworkManager-glib for the lower version, however didn't do anything to the same file on the latest version. Almost as if it wasn't installed. Now, with the downgraded version as current, yum wants to update both NetworkManager and NetworkManager-glib to the latest version. I couldn't swear to it, but I think the original update to NetworkManager did not include the *-glib dep, but now it does. Maybe that was the problem all along?
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Feb 26, 2011
I can't connect internet using ADSL modem of bsnl.I am new user of linux(fedora8).To do so I go through system>administration>network configuration and trying to activate xdsl modem and ethernet but unfortunately ethernet does not seems though there is a ethernet card.Here it should be mention that in my windowsXP partion there is no problem for internet connection.so what can I do next?
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Jun 4, 2011
Using a set of instruction given to me, I was able to set up a Macintosh system running Mac OS X to successfully connect to a virtual private network.I then tried to adapt those same instruction to configure a system running Fedora Linux 12 on an Intel Core2 Duo system.However when I try to connect using the NetworkManager Applet, I get an error that saying the VPN connection failed, with no clear indication of what the actual problem is.What can I do to troubleshoot this problem and find out why the connection is failing?
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May 20, 2011
is there a way to implement fault tolerance in case of LAN failure on SUSE 10 sp3 i.e. if 1 LAN port fails then the 2nd LAN port should take over ..
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Jan 7, 2011
I have got a problem in the configuration of the network for my Linux box. The distribution is Slackware 12.2 with the 2.6.27.7-smp kernel. There are three ethernet NIC, one on the motherboard with Atheros AR8121/AR8113 chip and two on PCI card which with RealTek 8169.
I installed the module for Atheros which is the atl1e.ko and I defined the configuration for the three NICs in /etc/rc.d/rc.inet1.conf.
When I hit the commend ifconfig I see all the three interfaces eth0, eth1, and eth2, but the address are not distributed between the NICs as I'd like so I thought to resolve the inconvience with udev, but I don't know how to proceed because there is a strange situation.
If I control the file /etc/udev/rules.d/70-persistent-net.rules I see a strange situation: Once the file contains nonly a line for the Atheros NIC but if I reboot the system there are the two lines for the two RealTek NICs and everytime the system is rebooted there is a change between these two alternatives. A detail I noted is that the two modules atl1e and r8169 are both always loaded, so udev has always the chance to detect the hardware but for some reason that I don't know something goes wrong. Another related problem that bothers me is the absence of udevinfo and udevtest. Have I perhaps to reinstall udev?
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Dec 8, 2010
I just used dd to clone a linux partition to a new hard drive, it had 800mb left on the old hard drive, after dd, new hard drive lists 1.29/1.3 terabytes full. Is this what happens by default in dd? How can I fix this?
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Mar 16, 2010
I've just installed an ubuntu 9.10 server at my office and configure apache, php and mysql without problems.
Now i need to share some directories in order to wed developers access to the websites files.But when I try to share, ubuntu tries to install samba services, and I keep to get those errors:
"W: Failed to fetch url Size mismatch
W: Failed to fetch url
Size mismatch"
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May 4, 2010
I use an ADSL connection which I 'dial' using the Network Manager. My laptop is connected to the modem through an ethernet cable.
The thing is the place where I stay is prone for power failure. So the modem goes out with the power. It comes back on within a minute when the power is restored but Network Manager doesn't seem to automatically re-establish the connection after it is lost once. I have to manually do it. Hence most of my downloads do not get done.
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