Networking :: Ubuntu Machine Gets LAN But No Internet
Sep 12, 2009
A few weeks ago, my Ubuntu machine (Hardy Heron) suddenly stopped connecting to the internet. I usually run it headless, and it was still fine connecting to other machines on my LAN (in either direction), but I can't ping out or run any other 'net stuff. I even tried pinging by IP address instead of name. I did notice that my eth0 (I only have one NIC in the machine) had mysteriously changed to eth1, but I fixed the /etc/networking/interfaces file and the udev rules and now it's back to eth0. Still gets LAN but no internet. I've done ifup/ifdown a few times, even restarted more than once. I could always try another NIC, but I thought I get any hardware suggestions first.
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Mar 18, 2010
I have an ubuntu kk laptop connected via wireless to my mixed network (xp, win7, other ubuntu), but i can not ping said machine or connect via ssh. Internet and smb-browsing ON this machine work, as does pinging FROM it. If this was a windows machine, I'd say a firewall is in the way, but since it's a vanilla karmic install, this should not be the case (or should it?).
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Aug 18, 2010
I want to share my internet connection with my netbook which has a Win 7 starter OS. This is what I did: in Network Connections I set the IPv4 Setting of my network card to shared with other computers, plugged in the network cable into both machines, and now they both see a connection. Win 7 only sees the connection as Unidentified network with "No internet access". What should I do?
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Apr 29, 2010
How to create some sort of network, which would mean that one computer (Lubuntu in this case) is connecting to internet through second PC (Ubuntu), which is directly connected to cable, so maybe I get some manuals and tips. The computer which is connected to internet have two LAN cards (Realtek 8139 and integrated nVidia MCP65), Realtek card is connected to the internet provider cable (internet is tied to my computer's MAC address and uses static IP).
Second computer have also a Realtek card and it's connected to first computers integrated card. Anyhow - I've put on the first computer eth1 (which is integrated MCP65) IPV4 setting to "Shared to Other Computers" and IPV6 to "Link-Local Computers" and while I was having Windows XP on the second machine, setting on it (the XP machine) DHCP (or how was it correctly called, when system automatically resolves or gets the IP and the rest what it needs?), second computer was receiving Internet signal and I could use both of them in such way.
Now the second computer is with Lubuntu and I thought that I could do the same way as did on XP - just put in Network Manager for the connection (eth0) everything to automatical and there will be internet, but there aren't and the manager shows some kind of "Automatic Ethernet" option, which after activation also doesn't do anything. What do I have to do, to make my Lubuntu machine to recognize Ubuntu's eth1 and to use it as a source for Internet?
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Jan 29, 2010
My Ubuntu 9.10 (64 bit regular old desktop version) machine has two NICs, eth0 and eth1. eth0 does not connect to my router (and thus the Internet) automatically. I have to manually click on it in the NetworkManager applet after every reboot.
Internet connection sharing has also been impossible. I gave up trying to do that after about 2 weeks. I was simply trying to share my Internet connection with a Windows XP machine over eth1, but it never worked. I could ping one machine from the other, but couldn't get to the Internet from the Win XP machine.
Removing NetworkManager may be the ticket. Most of the tutorials for Internet connection sharing tell you to enter commands in the console. Maybe one of them will work once I remove the NetworkManager applet.
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Nov 17, 2010
I have an odd thing going on with DNS. I have two machine's running Ubuntu and for some reason they do not always resolved internet addresses on my Internet connection. This has gone on since the Ubuntu 8.04 when I first started using Ubuntu. Anyway, I use OpenDNS' DNS servers and I have been running perfectly.
This is what is odd. My Windows XP Machine never has the problem. It always resolves. Does Windows Possibly have some Microsoft hosted DNS server hard coded in there as a backup? Things are working fine this way so I am not looking to change. I am just a little puzzled and finally got around to asking, "Why is this".
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Oct 22, 2010
I have removed Network Manager Gnome from my Ubuntu which is a virtual machine(Guest OS),I see the internet is no more running inside this Virtual Machine.While in other Virtual Machines (Other Linux) I had not removed Network Manager Gnomeand I see internet is running fine in them.
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Oct 7, 2010
I am able to access internet, can ping other machines and can ssh into other machines. But cannot be pinged (it just hangs), and when trying to ssh into machine, it also hangs (no response)I checked the sshd daemon, it is not runningchkconfig --add sshdreboot, the sshd does not seem to come up.
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Jul 6, 2010
I have a problem with my wired connection. The problem started when I tried and failed to install vmware virtual machine.... now I have no internet connection at all that I can see. This is output of:
ifconfig
eth0 Link encap:Ethernet HWaddr 90:e6:ba:97:64:f0
inet6 addr: fe80::92e6:baff:fe97:64f0/64 Scope:Link
[code]....
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Sep 21, 2010
I have a machine (lets called it machine 1) with two networks card, eth0 and eth1. Both have static IPs. Once in a while the machine refuses to give access to the Internet via Firefox (eth0 is the route to router). Other machines on the network have no problems accessing the Internet. Eventually the machine would just magically start working again, but this time it just seems to have stayed broken. I've done some simple diagnostics and found:
a) I have another machine running Apache with a Wiki on our network - [URL]. Machine 1 is unable to connect to this Wiki. I get 'the connection has timed out'. I can ping 192.168.1.73 and it responds in the usual fashion.
b) If I try to ping www.google.com it times out with: ping: unknown host www.google.com. I can ping google using its IP address.
c) On machine 1 I have tried traceroute on both www.google.com and its IP and I just get:
1 * * *
2 * * *
And so on until hop 30. Doing this on any other machine on the network works. So while it seems I can ping internally in our network and outside, but when it attempts anything traceroute or URL related it does not work.
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Feb 11, 2010
I want to make make my fedora machine access-able over the internet. I want to assign IPV4 address to this machine( I already have one IP address ) which can be used for this. What configuration changes I need to make in fedora to make it accessable to the external world
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Oct 31, 2009
I have a WindowsXP virtual machine which I need to isolate from the host machine completely (have the host act as a bridge but not be visible on the IP layer at all.) It still needs to have Internet access. Obviously it has to be able to contact the router but I would like to be able to block port 80 (or even just block all SYN packets addressed to the router.) I also want to allow port forwarding from the router to the virtual machine. I can use basic iptables but this is way beyond me.
The host OS is probably going to be Debian Lenny but this is not built yet so if someone can recommend a different distro which is as lightweight as possible but will support VMWare, iptables and tcpdump then that would be great. I was thinking of Slackware but I have not used it in ages and from what I can remember their is no real package management.
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Feb 13, 2011
I try to access my ubuntu machine via my Windows Machine (Samba Server on Ubuntu Machine). Anytime I try to access the machine it asks me for my password...I enter it but it says it is invalid....is there anyway to reset it? I have already tried to remove and purge everything Samba related and then tried reinstalling, but that still didn't do anything
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Jul 24, 2010
It seems whenever i create a folder it creates the folder as untitled folder, but i can't change the folder name it just says "you don't have permission to rename item" but yet i created the folder and it is there. One thing i have noticed is that once i enter a folder it won't even let me move the folder.
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Dec 3, 2008
I have ubuntu-8.04.1-server installed on virtual machine. It works perfect. Now, I made copy of this virtual machine. I started that copied machine and it works fine, except one thing: network does not work!
I have several others VMs with freeBSD, openBSD or Windows on it, but only ubuntu machine hes network problem after coping. I tried some other VM with ubuntu on it - same problem! I downloaded VM with ubuntu - same problem.I take a look into /etc/network/interfaces file and it looks just as it should (same as before coping) but ifconfig command returns parameters for lo only (before coping there was eth0 and lo).
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Aug 28, 2010
I am trying to establish the easiest way to share a folder from an Ubuntu machine to a Windows machine.In the past I have added things to smb.conf and that has all worked fine but what I am trying to do is to figure out what the "new user" way of doing this is so that when I am helping other people I know I am getting them to do the simplest thing.I completely removed samba and reinstalled it so that I didn't have any configuration. Right clicked on a folder and selected "Sharing Options" ticked the "Share this folder box" gave it a name and a comment and ticked the other two boxes.
When I went to the windows laptop then it kept asking for a username/password and nothing worked.Back on the ubuntu machine I did sudo smbpasswd -a [username] and created a blank password. Now from the windows machine I can access the shared folder.Is the smbpasswd step still required? It's very confusing for a new user as there is no suggestion that anything other than right clicking on the folder and choosing the options you want would be required. Is it something to do with the fact that this is an ubuntu machine that has gradually been upgraded through versions and this problem wouldn't have been there from a new install?
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May 29, 2010
I can set-up an ssh tunnel from machine A to Machine B:-
fred@my-linux:~$ ssh -P myport fred@myserver.homelinux.com
I can successfully logon to machine A to Machine B.
what address and port will my tunnel 'appear' on machine B? I want to send a stream back from B to A up the encrypted tunnel, not over the open network.
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Feb 20, 2011
I have an issue with the manner in which Network Manager is configuring the network and short of ditching Network Manager I can see no solution.The issue : Getting a machine to update its machine name in the DNS serverSounds simple doesn't it I operate a FreeBSD based firewall / DHCP / DNS server, using a default Network Manager DHCP configuration the Fedora clients do not register their names with the DNS server when they obtain an address.
I have traced the communications with Wireshark and the Fedora clients are NOT supplying the PC's hostname as part of the exchange so this is NOT a DNS server configuration issue. If I uncheck the option 'Automatically obtain DNS information from provider' under the DHCP settings the Fedora clients DO register the hostname that is put into the Hostname (optional) databox. They do NOT however store the DNS server IP address or any other records defined by the DNS server.
Is there some hidden settings or is this a bug because it isn't acceptable 'DHCP' behaviour if it isn't possible to automatically set DNS server IP addresses and at the same time register the hostname during the DHCP negotiation. Before it is said I know I can use a fixed DNS IP address but am not prepared to long term, I am also not prepared to define the Fedora clients with a 'static' IP. I am similarly not interested in playing around with scripts or any other such 'frigs' to achieve what should be a standard activity - registering a host with DNS during the DHCP negotiation.
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Apr 9, 2010
I need to access a Windows Server 2000 machine using a Linux machine via KDE, but that will migrate to Gnome. The Linux user to connect to Windows machine, you should open an application 'XYZ' automatically, and only this, denying any unauthorized access. When you close the application 'XYZ' communications (RDP?) Should be terminated. Do I need a log of accesses and possible attempts to circumvent the system and access other application.
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Jul 6, 2010
I had run one script in unix machine and want to copy the results to a windows machineBoth the machines are on different networksIn linux machine trying to do the ftp to the windows machine its giving connection refused. How to chech whether ftp is running on that linux machine or not?Also tried scp and ssh , both are failing
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Jan 6, 2010
I have a ubuntu 9.04 machine i'm using as a file server. I'm able to see that machine from any XP machine, connect to it's shares play music, movies, work off of it NO problems. But i can't view the shares from a windows 7 home edition PC (garbage). AND, from the ubuntu PC, i can't see any of the other shares on network. I get "Fail to receive share list from server".
NOTE: Originally i had this machine connected with wireless card because of location. and I was able to see all shares then - both ways (still not from Windows 7 PCs though). However, when I moved to hard wire connection, the network disappeared. I've tried changing IP addresses, changing switches, but no network. I'd like to keep it hard wire. Can anyone point me in right direction or am i missing information?
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Oct 31, 2009
I have two machines, one has XP service pack2, second one has CentOS 5.3 (Linux), they are connected through crossover cable. I have configured everything fine but don't know why till now can't ping!
A. Windows machine settings as follows:
IP Address: 192.168.1.3
Subnet Mask: 255.255.255.0
Default Gatway: 192.168.1.1
+ Firewall is turned OFF.
B. For Linux machine, I will list everything stored in network files, logged as [root@localhost ~]# :
1. /etc/sysconfig/network:
ifconfig eth0 192.168.1.4 netmask 255.255.255.0 up
route add -net 192.168.1.0 netmask 255.255.255.0 eth0
route add default gw 192.168.1.1 eth0
NETWORKING = yes
NETWORKING_IPV6=no
HOSTNAME=localhost.localdomain
2. /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE="eth0"
IPADDR="192.168.1.4"
NETMASK="255.255.255.0"
ONBOOT="yes"
BOOTPROTO="yes"
3. /etc/resolv.conf
nameserver 192.168.1.4
search locadomain
4. I restarted network service using this command:
/etc/init.d/network start
everything is fine. When checking using ifconfig command. I get the following:
eth0 Link encap: Ethernet HWaddr 00:08:0D:EE:19:66
inet addr:192.168.1.4 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr:........
[code]....
I mean I assigned the IP: 192.168.1.4 to Linux machine (Eth0). I did everything above and can't ping till now, when pinging from windows or Linux I get a message "destination host unreachable" restarted Linux many times but same result. NETWORK CABLE is working fine I tested it.
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Mar 1, 2011
I've run into a weird problem. Two of my linux machines (A and B, both running CentOS 5.5) are connected to the same wall ethernet socket via a hub. Bothf them are configured for static IPs. The trouble is that when machine B goes offline or hits a kernel panic, machine 1 goes offline too. What I've noticed is that in this condition the "route" output from machine A does not show any entry for the default gateway either The contents of /etc/sysconfig/network-scripts/ifcfg-eth0 for machine A are:
Code:
# Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller
DEVICE=eth0
[code]...
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Jan 17, 2010
Ive successfully set up Ubuntu on a desktop computer I got for free (because it�s RAM was half destroyed by a virus and the owner got a new one). I don�t have this computer connected to the internet but I can get the internet on my laptop�s built in wifi (from some random neighbour who has an unsecure WLAN). So, to install programs on Ubuntu I have to download the .deb or .ter.gz files from the laptop (winXP), copy them to a USB drive, transfer them to the Linux machine and install. Problem is, none have worked so far:
[Code]....
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Jun 7, 2009
I have built an Ubuntu 8.10 server machine with great agony as I have no internet. I need to make another machine and install the same software packages. I already have the packages I need. What do I need to copy from the first machine so that the second machine will install these packages? I'm not referring to the packages themselves (I can copy them over and install them). I need to get the apt database in synch with the first machine. I assume that apt has some sort of database files? Without that configuration, the damn machine keeps trying to connect to the internet.
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Feb 12, 2010
I have a Windows XP virtual machine under Virtualbox PUEL 3.1.2. I have always been able to browse the Web or do anything else I wanted over the network.
Suddenly, the guest XP machine can't reach the Internet any more. There is no indication of any problem with the network connection. I checked my router, and the virtual machine is indeed getting assigned an IP address. So why can't it reach the internet?
Yes, the virtual network adapter is in bridged mode. It always worked that way before. I can see local network shares from the virtual XP machine, and even reach the Apache server running on the host OS (Ubuntu 9.10 64-bit).
Also possibly significant: Even though the virtual XP machine is detected by the router & assigned an IP address, the printer attached to the virtual XP machine cannot be seen by another Windows machine (a real one, not virtual) on the network. I never had a problem sharing the printer before. I have to share it from a virtual Windows XP machine when I'm running Ubuntu because there are no Linux drivers available (it's a Winprinter).
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Nov 20, 2010
I want to download Remmina Remote Desktop Client on a computer without an Internet connection, I have tried the option "download package files only" in synaptic but I can't see where the files are being installed to.
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Jan 25, 2011
I am a new user trying Ubuntu 10.Got it up and running.Can connect to the internet.Can send and receive E Mail.Can see my Win XP machine that is also on my home netwook.Can transfer files from my Win XP machine to my Ubuntu Machine but just cannot work out how to get my WIn XP machine to see my Ubuntu machine.
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Dec 16, 2010
I am in a pvt n/w 192.168.0.0/24 and my friend is is another n/w 192.168.1.0/24 . He is in another location. Can I access his machine through vnc over internet ? I have centos 5 and he has suse 10.
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Mar 31, 2011
I am using squid3 on ubuntu server 10.10, publish my webserver running on other machine on ubuntu10.10 desktop. My server is configured for squid3 transparent proxy which is running successfully.
Now I need to publish my other machine which is running with apache2 webserver.The local IP is 192.168.1.5, I need to assign a public IP as 61.8.153.212 provided by ISP.
use my webserver machine outside the LAN using internet, through ubuntu server 10.10 squid3.
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