Announcement

**lingenfr** · Dec 27, 2007, 05:26 PM

Re: Network connection lost after upgrading to Kubuntu 7.10

I have found that sometimes it just takes a kick start to get things going. The first thing I would do is go to a console and do the following:

sudo ifdown eth0
sudo ifup eth0

If that didn't do it, did you get any errors? My experience is that if that works it will work automagically afterwards.

**GeertVc** · Dec 28, 2007, 01:16 AM

Re: Network connection lost after upgrading to Kubuntu 7.10

Originally posted by lingenfr

sudo ifdown eth0
sudo ifup eth0

If that didn't do it, did you get any errors? My experience is that if that works it will work automagically afterwards.

That is what I've tried already a couple of times, but without success.

I'm also sure it has nothing to do with the rest of the infrastructure (router etc.), since I also installed Kubuntu 7.10 (a fresh installation, directly from the iso file, not via the upgrade way of working) on a new harddisk -also under the same VMware app- without any problems at all.

The problem I'm facing is something that must have happened during the upgrade process, but I don't know where exactly...

I could use the new installation, of course, but there are a few important files which I would not like to lose. And next to this, there must be a cause of the problem: it would be interesting (and important) to know exactly what it was...

If I get any errors?

Well, next to the one given by KNetworkManager (see original post), I get the following when trying to ping to my router:

geertvc@LinGevaWare:~$ ping 192.168.123.254
connect: Network is unreachable

Are there any other commands I should run to see for extra information? Pls. let me know...

Also, I've attached screen shots from the Network Settings in System Settings (started up as "sudo systemsettings", otherwise you can't do/select anything...):

network_interface.png
configure_eth0.png
domain_name_system.png

And this is what I get when I execute the command ipconfig under WindowsXp (Dutch):

C:\Documents and Settings\Geert Vancompernolle>ipconfig

Windows IP-configuratie

Ethernet-adapter VMware Network Adapter VMnet8:

Verbindingsspec. DNS-achtervoegsel:
IP-adres. . . . . . . . . . . . . : 192.168.113.1
Subnetmasker. . . . . . . . . . . : 255.255.255.0
Standaardgateway. . . . . . . . . :

Ethernet-adapter VMware Network Adapter VMnet1:

Verbindingsspec. DNS-achtervoegsel:
IP-adres. . . . . . . . . . . . . : 192.168.203.1
Subnetmasker. . . . . . . . . . . : 255.255.255.0
Standaardgateway. . . . . . . . . :

Ethernet-adapter LAN-verbinding:

Verbindingsspec. DNS-achtervoegsel: MyGvcDomain
IP-adres. . . . . . . . . . . . . : 192.168.123.145
Subnetmasker. . . . . . . . . . . : 255.255.255.0
Standaardgateway. . . . . . . . . : 192.168.123.254

Best rgds,

--Geert

Attached Files

**lingenfr** · Dec 28, 2007, 06:45 AM

Re: Network connection lost after upgrading to Kubuntu 7.10

If you manually input the nameservers, I would delete those. Do you have link/activity lights? I am still researching. So far I can't find anyone else who is having a problem. Can you check your VM settings?

**GeertVc** · Dec 28, 2007, 12:20 PM

Re: Network connection lost after upgrading to Kubuntu 7.10

Originally posted by lingenfr

If you manually input the nameservers, I would delete those. Do you have link/activity lights? I am still researching. So far I can't find anyone else who is having a problem. Can you check your VM settings?

Well, I didn't put anything manually regarding the nameservers, but I've deleted them as per your device, but that doesn't seem to help me a lot.

Regarding the link/activity lights, can't see anything reacting on my router (since pinging to the router address is giving me an error, I think it's normal I don't see any lights flashing on my router itself...)

Regarding VMware itself: the hardware settings of the ethernet controller tells me it's bridged. That's all I can see wrt VMware itself.

I would like to re-install VMware tools, but the compilation fails on the fact that it can't find the locations of the C header files.
Will have to look for the cause of this...

Best rgds,

--Geert

**lingenfr** · Dec 28, 2007, 04:55 PM

Re: Network connection lost after upgrading to Kubuntu 7.10

According to my research that card works out of the box. If it is working in Windows and not in Kubuntu the problem is with VMWare. I don't run it anymore as I went to VirtualBox, so hopefully someone who runs VMW can help.

**oznoob** · Dec 30, 2007, 03:21 PM

Re: Network connection lost after upgrading to Kubuntu 7.10

Hello Geert
Have you tried to check your /etc/network/interfaces file as i had a similar problem with my connection. After I checked mine i found a line missing,
auto eth0, after i added this line, everything worked. not sure if it will solve your problem, but could be worth a try
regards Uli

**GeertVc** · Dec 31, 2007, 02:05 AM

Re: Network connection lost after upgrading to Kubuntu 7.10

Originally posted by gettin'there

Hello Geert
Have you tried to check your /etc/network/interfaces file as i had a similar problem with my connection. After I checked mine i found a line missing,
auto eth0, after i added this line, everything worked. not sure if it will solve your problem, but could be worth a try
regards Uli

Hi Uli,

This is the content of my /etc/network/interfaces file:

geertvc@LinGevaWare:/media$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
address 127.0.0.1
netmask 255.0.0.0

auto eth0
iface eth0 inet dhcp

As you can see, eth0 is defined...

But what I see is, when I do an ifconfig, I get an inet6 IP address. God knows where this is coming from...

This is the result of ifconfig (see the red line in the listing):

geertvc@LinGevaWare:/media$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:0C:29:44:23:BE
inet6 addr: fe80::20c:29ff:fe44:23be/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:194 errors:0 dropped:0 overruns:0 frame:0
TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:25107 (24.5 KB) TX bytes:3456 (3.3 KB)
Interrupt:17 Base address:0x1400

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:472 errors:0 dropped:0 overruns:0 frame:0
TX packets:472 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:34216 (33.4 KB) TX bytes:34216 (33.4 KB)

Still remains a complete mystery, but anyway thanks for your suggestion!

Best rgds,

--Geert

**groenem** · Feb 06, 2008, 03:39 PM

Re: Network connection lost after upgrading to Kubuntu 7.10

I have the same problem problem after I have upgraded from 7.04 to 7.10. I am running Linux alone on a old Compaq AP200 computer. I have tried the

sudo ifdown eth0
sudo ifup eth0

commands, but still no joy. I don't know what to do.

Doing a clean install from CD is not an option, because I have downloaded a few additional applications which are not part of the LiveCD. I do not want to do a clean install everytime I want to upgrade and download all my extra applications again.

**GeertVc** · Feb 08, 2008, 12:12 PM

Re: Network connection lost after upgrading to Kubuntu 7.10

Originally posted by groenem

I do not want to do a clean install everytime I want to upgrade and download all my extra applications again.

Well, I have not been able to repair my problem. The only way out I had was starting from scratch on a new harddisk, taking the downloaded .iso file for the version 7.10

I'm afraid this will be the only way out, unless someone in the community still has some ideas?

Best rgds,

--Geert

**rbrown3rd** · Feb 19, 2008, 08:09 PM

Re: Network connection lost after upgrading to Kubuntu 7.10

I am having a similar problem. My old install on the dual boot WinXP, Kubuntu system worked flawlessly for months. After upgrading to 7.10 connecting to my network is a sometimes thing. By that I mean that sometimes it will connect and remain connected but at other times I will have to restart the system several times to get a connection. I will dry the eth0 up and down thing. Maybe that will help.

**rbrown3rd** · Feb 20, 2008, 01:57 PM

Re: Network connection lost after upgrading to Kubuntu 7.10

Update: The ifup and ifdown did not help. It seems that there is a connection when the desktop first boots up. Sometimes I can get Firefox running and do a few things and then it drops out. Sometimes it persists for hours. I have checked all of the settings in the Knetwork Manager and they seem to be correct. I know very little about networking and am also a novice at Linux. I did enjoy it a lot until I upgraded and now have this non persistent network connection. I would greatly appreciate any help anyone can provide.

**cmoman** · Feb 21, 2008, 08:57 AM

Re: Network connection lost after upgrading to Kubuntu 7.10

geertvc@LinGevaWare:/media$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
address 127.0.0.1
netmask 255.0.0.0

auto eth0
iface eth0 inet dhcp

From my experience KNetworkManager gives /etc/netword/interfaces precedence and doesn't actually change anything if the network interface is specified. Try

geertvc@LinGevaWare:/media$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
address 127.0.0.1
netmask 255.0.0.0

#auto eth0
#iface eth0 inet dhcp

and reboot. See if this helps. It has resolved other slightly similar problems for me.

**rbrown3rd** · Feb 21, 2008, 09:21 AM

Re: Network connection lost after upgrading to Kubuntu 7.10

Thanks. I will give it a try. My connection is stable this morning but it is unpredictable.

**rbrown3rd** · Feb 22, 2008, 10:05 AM

Re: Network connection lost after upgrading to Kubuntu 7.10

Still unpredictable. I have to reboot often to get a stable connection. Gateway IP seems to disappear and revert back to 0.0.0.0 Don't know if that is significant or not.

Announcement

Network connection lost after upgrading to Kubuntu 7.10

Network connection lost after upgrading to Kubuntu 7.10

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment