Ubuntu Networking :: Internet Stops When LAN Switch Is Switched ON

Jul 29, 2010

My PC is connected to an modem (DHCP) with IP 192.168.1.21 on eth0 Internet works perfectly I have installed an additional LAN card and configured it as eth1 with IP of 192.168.0.1 When I connect this LAN card to a LAN switch which in turn is connected to 6 other PCs, the internet stops working. As soon as I switch OFF the LAN switch, I am able to access internet. The IP addresses of the other PCs are configured as 192.168.0.2 etc. with gateway as 192.168.0.1 and DNS same as the DNS on the external interface. I can ping 192.168.0.1 from the LAN but neither LAN nor the main PC can access net. I was planning to Masquerade and NAT the other computers without using squid

My setup is as follows

ISP - Modem(192.168.1.1) - Ubuntu desktop 9.04(external interface eth0 192.168.1.21 & internal interface eth1 192.168.0.1) - switch - LAN (comprising of Ubtuntu 9.04, 9.10, 10.4 & XP machines with IP 192.168.0.2 - 8 and gateway of 192.168.0.1) I did NAT as per [URL]
This worked perfectly well 1 day Next day onwards whenever the LAN switch is "ON" the main Ubuntu wudnt get internet and the internet connection would work only when the LAN switch is turned "OFF". Even if all the PCs in LAN were to be switched off, the main Ubuntu would behave similarly i.e. internet would work only when switch isn't connected to it or switched off.

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Networking :: Internet Stops When LAN Switch Is Switched ON?

Jul 28, 2010

My PC is connected to an ISP with IP 192.168.1.21 on eth0Internet works perfectlyI havenstalled an additional LAN card and configured it as eth1 with IP of 192.168.0.1When I connect this LAN card to a LAN switch which in turn is connected to 6 other PCs, the internet stops working.As soon as I switch OFF the LAN switch, I am able to access internet.The IP addresses of the other PCs are configured as 192.168.0.2 etc. with gateway as 192.168.0.1 and DNS as the ISP DNS.I can ping 192.168.0.1 from the LAN but neither LAN nor the main PC can access net.I was planning to Masquerade and NAT the other computers without using squidMy main PC runs on Ubuntu 9.04 and out of the 6PCs on LAN, 2 are on Windows XP, 1 on Ubuntu 10.4, 1 on

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Jun 21, 2011

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I didn't change anything from the previous day, just switched it on. The only significant difference I can think of between my computer and the other desktops is mine has the KDE desktop installed.

Things I've tried:
- Restart router
- Boot into different DE eg. normal, classic, KDE
- Unplug ethernet cable and plug it back in
- Restart computer

My computer is connected using the powerline system along with 1 of the other desktops so it can't be that, it must be something at my end.

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Jun 30, 2010

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Basically for example i watch a video on ..... and it never fully loads. Even when i browse pages dont fully load and i must wait a few seconds before i press reload.

I am connected through cable. Network is working fine on other OS

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Apr 18, 2010

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Mar 2, 2011

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In viewing another thread,..lems+-wireless, I found a bunch of commands that it was said would be helpful diagnosing this issue. That said, below is the output of all the commands that I could think of.

Sudo ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:e0:18:5c:45:7a
inet addr:192.168.2.1 Bcast:192.168.2.255 Mask:255.255.255.0

[code]...

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Apr 30, 2011

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Apr 11, 2010

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Jan 21, 2011

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Nov 11, 2010

a few weeks back I got an Indian Reliance 3g dongle. I installed usb-modeswitch, plugged in and it seemed to work brilliantly in Ubuntu 10.04.The problem was it was dropping the connection every ten minutes. The logs had the error message "Terminating on signal 15".I had to unplug the dongle and then it would connect again.x the problem, I tried installing first Sakis3G and then Betawine, both of which were reported by some users to haved. Sakis said "the device did not report GSM capabilities"d no good.Installing Betawine was apparently a bad idea, as after that the dongle ceased to work with Network Manager and Betawine itself was useless. Uninstalling Betawine and re-installing usb-modeswitch did no good.Now, when I plug in the dongle, the logs say:Quote:

Nov 9 17:52:31 lauri-laptop kernel: [28563.368241] usb 5-2: new full speed USB device using uhci_hcd and address 3
Nov 9 17:52:31 lauri-laptop kernel: [28563.530547] usb 5-2: configuration #1 chosen from 1

[code]...

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Aug 13, 2011

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after my router swap, my connection for windows was back, although i had to pull out the network cable and plug it back in for this to happen. unfortunately my connection in ubuntu is still gone. i see the connection in network manager, but i cant access the internet through it. i tried setting up a new one with the same settings, to no avail. i connect to the internet directly through my router. i tried finding some documentation for it but havent had luck with that. is there some way to reset the connection? or let ubuntu set up a new one like when i'm doing a fresh install? i think that ubnuntu still thinks i'm using the old router and that this is the cause for the connection fail.

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Feb 11, 2010

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Nov 13, 2010

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3. Needless to say, this error is manifesting itself in apt-get as well. I get "something wicked happened" errors all the time, and am unable to download or install anything.That this is not a problem with the ISP is obvious because I also have Windows (from which I'm typing this, ironically), which is able to access the internet.Is this a bug in Ubuntu 10.10?

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Mar 21, 2010

I just recently erased my hard drive and installed ubuntu 9.10 all over again. I updated as expected and everything was going well, until, my internet stopped working after maybe 40 mins or so after a successful boot. Now this same thing happens every 40 mins and I have to reboot the computer by forcing my laptop to shut down by holding down the power button. This also made me aware of another problem when restarting or logging off my laptop. The laptop hangs at that terminal-syled screen and the underscore blinks and fails to shut the computer down/log off. I resort to holding down the power button to restart. I am using a wireless connection with WEP key protection.

Atheros network chip
Laptop Acer Aspire 5532
It just happened again..... I am typing now in tomboy notes....
Time to restart again......
I also try to open terminal and it fails to function (after the internet stop working), any reason for that? I would also like to note that the signal strength decreases as time passes by.......

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Feb 10, 2010

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May 31, 2010

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My laptop is an IBM t40, 1.4 ghz, 2gig of ram.It does not seem to mater if Im using the wireless or the wired connection. The problem happens either way.does anyone have a solution for this?

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Jul 3, 2011

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[Code]...

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Feb 6, 2010

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Apr 4, 2011

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Also- is there some log file I might could look at to see what caused the shutdown?

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Aug 30, 2010

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Jul 20, 2010

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Sep 24, 2010

I installed the latest KDE desktop on my Ubuntu 10.04 system. When I switched to KDE the screen ends up black with no access to anything. I reboot but don't have access to the session manager on the ubuntu login screen so I can't get back into my Ubuntu desktop. What can I do?Embarrasingly, I had to log on via Windows 7 (its a dual boot setup) to gain access to the Ubuntu Forums

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Apr 28, 2011

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Jun 16, 2010

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Aug 18, 2010

my server which shares my internet connection with the rest of the house recently started to randomly quit the eth0 connection and the sharing connected with that. after a reboot all is fine again /var/log/messages shows the following

Code:
Aug 18 19:53:36 Gomorrah kernel: [93072.000029] ------------[ cut here ]------------
Aug 18 19:53:36 Gomorrah kernel: [93072.000048] WARNING: at /build/buildd/linux-2.6.31

[code]...

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Oct 22, 2010

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Network, then
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logfile I can check, or a setting I can tweak to fix this issue ?

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Mar 5, 2010

So I installed xubuntu-desktop and have been using XFCE as my desktop and everything's groovy except for one thing.

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Code:
andrew@guardian:~$ ssh <hostname of server>
Enter passphrase for key '/home/user/.ssh/id_dsa':
Enter passphrase for key '/home/user/.ssh/id_dsa':
Enter passphrase for key '/home/user/.ssh/id_dsa':
*****@*******.net's password:
(Note: I redacted the server name and username.)

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Jun 13, 2011

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