Ubuntu Networking :: Cannot Get LAN Connection Back
May 31, 2011
My machine all of a sudden stopped connecting to the internet. I use the ethernet port and don't have a wireless connection. Another computer connects just fine to the router and gets the connection so I know the router and cable modem are working. I tested the cable and it is working. I tried plugging the computer directly into the modem but nothing. I tried sudo ifconfig eth0 down and then up but nothing. I tried sudo dhclient eth0 but nothing. Just keeps saying No DHCPOFFFERS received.
I am running ubuntu 9.1 on a Dell Dimension 2400. After installing ubuntu on the pc, it was automatically recognizing my router and connecting to the internet fine via ethernet. Then, my roommate unplugged the router and it won't recognize it. I can't access my router settings, and ubuntu is recognizing it as "inactive" but every other computer in the apartment runs fine. My PC uses a broadcom ethernet controller, and my router is a Linksys wireless N.
OS: Maverick Ethernet driver: tested with sky2 an sk98lin This has been driving me crazy for the last few months: if I unplug ethernet cable while my laptop is on reconnecting it sometimes does not bring the connection back.
And once ethernet is gone nothing that I try seems to consistently bring it back. Rebooting, disabling/enabling the driver, disabling/enabling NIC in BIOS, changing driver from sky2 to sk98lin, deleting connection from Network Manager, resetting the router - nothing helps. It seems to come back randomly a few weeks later. Once I used live Ubuntu on a USB stick and ethernet came back not only on a live distro but then when I rebooted also on my main OS. But when I tried that trick next time ethernet was missing in the live distro as well.
Also once I was able to revive ethernet but compiling sk98lin driver, blacklisting sky2 and rebooting. Of course next time doing the same routine did not help. The thing is - ethernet works fine with either sky2 or sk98lin and I can unplug the cable and plug it back in most of the time without any issues. But then every so often - bang and I'm stuck with only wireless until ethernet suddenly starts working again.
I was on my wireless network when I accidently switched on "airplane mode". Several reboots later and I can't get back onto my network. It keeps prompting for a password, even though it's the correct password. I've booted into Mac OSX & Windows on the same laptop and they connect no problems.
How can I delete the network connection to take it from the top again ? You used to be able to right click on the network connection in F14, select "edit connections" and then delete anything that was offending. That seems to have been removed now though ? Where is it stored and where can I kill it ?
Its disappeared before and its gone again> Last time this happened there was a root input which solved the problem but did not take a note of it and cannot find it through google this time Basically left my Linux Acer Aspire One and when I returned to it, connection manager had disappeared and cannot get it back.
I'm testing my mail server, and sending email works fine. However, when I tried to send emails to my server from gmail, I get this log:
Code: Aug 8 14:18:17 anbient postfix/smtpd[14228]: warning: database /etc/postfix/virtual.db is older than source file /etc/postfix/virtual Aug 8 14:18:17 anbient postfix/smtpd[14228]: connect from mail-qy0-f169.google.com[209.85.216.169] Aug 8 14:18:17 anbient postfix/smtpd[14228]: F3D4B1DD02C0: client=mail-qy0-f169.google.com[209.85.216.169] Aug 8 14:18:18 anbient postfix/cleanup[9988]: F3D4B1DD02C0: message-id=<4C5EBC96.2030800@gmail.com> Aug 8 14:18:18 anbient postfix/qmgr[9993]: F3D4B1DD02C0: from=<felipefidelix@gmail.com>, size=1982, nrcpt=1 (queue active) Aug 8 14:18:18 anbient postfix/smtp[9995]: connect to net[174.132.240.146]:25: Connection refused Aug 8 14:18:18 anbient postfix/smtp[9995]: F3D4B1DD02C0: to=<fidelix@net>, orig_to=<eu@felipefidelix.com>, relay=none, delay=0.15, delays=0.09/0/0.05/0, dsn=4.4.1, status=deferred (connect to net[174.132.240.146]:25: Connection refused)
And this is strange. 174.132.240.146 seems to be the web address 'net.net'. I am sure this has to be some setting in postfix, cuz its trying to deliver the email to 'fidelix@net', and that cant be right.
Here is my postconf -n output: Code: root@anbient:/var/mail# postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix home_mailbox = Maildir/ .....
I have Ubuntu 10.10 installed. I am very new to Linux. I am having a problem connecting to wireless network when I reboot to Vista OS. When I am using Ubuntu, it works fine. I have to plug in the LAN cable in order to connect to internet. When I try to connect to wireless network, I don't see any networks at all. My WiFi switch is ON. I keep switching back and forth between Vista OS and Linux.Narendra
I'm trying to create a PAN (Personal Area Network) using a laptop (Siragon ML-1040) and my desktop computer, but I get the Connection Refused (111) error.
Blueman doesn't detect any network service between the two computers unless I start PAND on one of them and then it detects the NAP service. That, only after I enable the NAP/Workgroup services on the Services submenu in Blueman. However, it doesn't work neither with the NM plugins or without them (dhclient and that other one I can't remember the name of).
Any clues over here? I'm using pand 4.91 and blueman.
Its a case of ".... wireless network connection active but still not internet connection .."I am using WEP - 128 key ... Works when I connect directly using ethernet cable ... but not wireless (pci and wireless router)
I'm trying to do a SSH connection between my home and work PC both machines are running ubuntu 10.04. I have read all the comunity documentation at [URL] from Work PC. I went on to the web site what is my ip address and noted down the number, From Home i opened a terminal and typed: pnig (ip address). to which their was no reply, now i'm assuming i need to configure the works router to except connection requests, is this Correct?
Also what information do i need from my works network and how do i get it? I understand that I need the routers expernal ip address, but how do i referiance a specified computer after that address? What program do i use in ubunu and how is that information applied to it?
When I have video running and the video stops, I see that the connection is destroyed in about 5 seconds, which is what I want. If, rather than stopping the video, I pull the plug, I have seen it take 350 and 380 seconds before the connection is destroyed. Why is there such a large difference in the time to destroy a video connection between stopping the video and pulling the plug on it when using net filter connection tracking? How can I shorten the time for the connection to get destroyed when pulling the plug?
I have two linux laptops. Currently, I'm using both of them at work, side-by-side. Now the problem is, I'm connected to a wireless router, but the wireless only works on one of the laptops. So I'm stuck with one laptop that has no access to the internet. Both machines do, however, have working ethernet nic cards. So, I was wondering if I could use the laptop with the wireless connection to share the internet connection with my other linux machine and access the internet on both of them. Or as an alternative, just use the internet on the machine without wireless and be able to switch back and forth, that would increase my productivity like 30 fold.
I'm trying to setup PPPoE connection to establish my DSL connection, but I got
Code: pppoe[3885]: read (asyncReadFromPPP): Session 4479: Input/output error pppd[4104]: Cannot determine ethernet address for proxy ARP in my sylog file.
When I do pppoe-start, it connected but I cannot ping into any destination (even to my modem in the same network). DNS servers are explicitly set in pppoe.conf and resolv.conf. Did I miss anything?
I have problem in making connection to my vpn server I can make connection from windows xp to that but can not open any website and I can not ping 172.16.10.1 when connection established.
These are my configuration files:
server config file:
Quote:
client configuration file:
Quote:
And this is my server syslog tailed file:
Quote:
And I added this routing to /etc/rc.d:
Quote:
And this is my iptable:
Quote:
And vpn connection is lost after establishing a lot.
I have just installed ubuntu 10 on a thinkpad t410. At first everything worked swimmingly, INCLUDING the wireless. After about five minutes, the wireless stopped working, in that it seemed to think it was still connected but pinging didn't work. I've now restarted several times, and each time I restart, the wireless works for about 1 minute, then stops working. If I try to disconnect and reconnect it will not reconnect (until I restart, that is).
iwconfig shows the correct ESSID and ifconfig shows an address, and "connection information" shows a varying percentage of connection.
I connect to my work with GRDC through a VPN. All worked fine until yesterday. IT is now very slow. Could this have anything to do with the fact that Update Manager was only able to do a partial upgrade?
I use Ubuntu 9.10 I tried the RDC on a Win XP machine and the speed is normal, so I don't think the Remote Desktop Server is the problem. Is there a way to test thespeed of the VPN connection or the RDC connection?
I have 2 computer: 1 computer install ubuntu v9.10, in this computer already installed openssh-server and openssh-client, and 1 computer install windows. In computer with windows , i used putty connect to computer with ubuntu, but i can't connect. I don't understand what's error. In the Putty , i configured: IP : IP address of computer Ubuntu. Port 22 Connection Type SSH
This is error: "Network Error: Software caused connection abort"
In computer with windows, i can ping computer with ubuntu and in computer with ubuntu i can ping computer with windows.
I have the "Work Offline" problem: when I boot up, the icon on the toolbar tells me I have "No network connection". This is not quite true, since I can access the first page of any website - only subsequent pages are inaccessible. I get a message saying that Firefox is offline. However, when I uncheck "Work Offline" in the File menu, it makes no difference to this behavior.
The problem is on my Ubuntu Dell desktop, which is connected to the internet with cable broadband via a D-Link router (wired connection). It has worked fine up till now. I use Ubuntu 10.04 and Firefox 3.6.11. I am writing this on my Ubuntu Dell laptop which is wired to the same router, so I assume the problem is not the router. I have tried various strategies suggested in threads on these forums, including editing about:config, changing "allow" to "deny" in some lines of /etc/dbus-1/system.d/NetworkManager.conf and changing from Automatic (DHCP) to Automatic (DHCP) Addresses only, but no luck so far. The contents of ifconfig are:
If I comment out "auto eth0" as well, it makes no difference. If I uncomment both lines ("auto eth0" and "iface eth0 inet dhcp") then I lose the internet connection altogether.
I am running Ubuntu 10.10, and I would like to use my computer to share the internet connection from an ethernet port. For example, I would like to set up my computer as a wireless access point so I can create a network that other computers can connect to for internet.
i m using RHEL5 on my server machine and open suse 10 on my client machine.both system ping each other, firewall is off of my server machine,i put a file from my client to my server machine using scp command but ftp command is not working when i want to open connection i receive a message "connection refused".what can be the issue?
10.04 I managed to delete the Volume Applet that appears by default on the task bar. I'm sure it used to be listed in 'Add to Panel' in other version of Ubuntu however I can't see it there in 10.04. Can someone explain to me how I get it back?
I've got an Ubuntu web server running 9.04 & Apache2. Ive got 2 NICs, one with an internal address for the LAN and one with and external address for the WAN to host the websites. My IP configuration is as follows (/etc/network/interfaces):
# The loopback network interface auto lo eth0 eth1 iface lo inet loopback # The primary network interface (WAN) iface eth0 inet static
[Code]...
When i do a traceroute from a LAN PC and it makes it all the way to the router and then just stops. I'm probably missing something very simple, its been probably 10 years since i took a class in this.
Using karmic on acer aspire 5332.Wifi was working from fresh install but would drop out often and sometimes freeze laptop resulting in hard reset.Installed Ndiswrapper to try windows wireless drivers unfortunately i can't get them to work. How can i revert back to original supplied drivers?
I have a dial-up 56k (no broadband available here) modem connection via ppp0 and a home LAN connection to two other systems through a DD-WRT set up router using eth0 wired and eth1 wireless. ppp and eth don't work to together. Something about DNS and resolv.conf resetting the DNS. I don't understand why it does this or how that system works or why it can't be worked around, but apparently it can't. I can dial into the Internet but if i was connected to the LAN before doing so I can't connect to any sites. The reverse with the LAN is also true. I have to shut down one or the other interface for the other interface to function correctly.
I've asked for help in these forums, specifically networking several times but seem to have hit the back hole of help when it come to issues for which their isn't a solution. I assume they think that if they ignore me I'll just go away, so I've moved to this forum hoping for better results.
In regards to my title question; if I switch to Window7(ugh!) or XP(groan!) will I be able to do these things. I'm sure there is someone with a dual boot system who can enlighten me to this. I've been using Ubuntu since Dapper and I did years ago have an Ethernet and ppp0 dial-up connection working together with ICS. I don't understand why doesn't it work now? OF COURSE if you have solution to my problem so it will work with my Ubuntu Lucid systems I'd be forever in your debit! I really don't want to return to using windows.
I can ssh from my local machine (Ubuntu 10.4 64bit) to a remote Linux server. When I try to copy a file back to my machine (or just ssh to my machine) I get the following error - "port 22: No route to host".ifconfig on my local machine gives one ip address for "lo Link encap:Local Loopback" and one for "wlan0 Link encap:Ethernet"; I tried ssh both.I work on a laptop with a wireless router (which is also the modem)
I was running a patch of my wifi connection and now i have NO wifi at all. I am totally lost right now. i have been running throught all the threads but nothing is really working. Is there a way do a full system restore (like windows) that will undo all my mistakes? my wifi has always worked until i screwed something up!
I have a Dell Inspiron 6400 Notebook. Even though the bluetooth light is on on the machine itself, the bluetooth icon at the top of the screen has been greyed out. Now, after trying to fix the problem, the icon has disappeared altogether.Before the icon disappeared, while the icon was greyed out, I was unable to enable it. If I clicked on the greyed-out icon, it told me bluetooth was on but disabled.Now I need to know how to get the icon back and to enable bluetooth.
