Unstable Internet connection

[viktorjano]

I want to ask why Ubuntu Server 12.04 is very unstable concerning its connection to Internet. Once I am starting it has Internet connection, than reboot it, and all of a sudden it can not connect. I really dont understand. If someone else faces this kind of problems please write down. Thanx

[sandyd]

We will need some information in order to help you diagnose the issue.

What kind of network is the server connected to? DHCP/Static Addressing/Server at Datacenter?

Also, post the output of

lspci
ifconfig

[d4m1r]

Laptop or desktop? Wireless or wired connection?

Need a lot more info but it sounds like user error so far...

[viktorjano]

Hi!
Here is the ifconfig output:

eth0 Link encap:Ethernet HWaddr 00:19:66:44:1e:2b
inet addr:192.168.0.128 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::219:66ff:fe44:1e2b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2847 errors:0 dropped:0 overruns:0 frame:0
TX packets:1436 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1633632 (1.6 MB) TX bytes:192532 (192.5 KB)
Interrupt:40 Base address:0xe000

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:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1296 (1.2 KB) TX bytes:1296 (1.2 KB)

I am in a dhcp environment.
And lspci output:

00:00.0 Host bridge: Intel Corporation 82945G/GZ/P/PL Memory Controller Hub (rev 02)
00:01.0 PCI bridge: Intel Corporation 82945G/GZ/P/PL PCI Express Root Port (rev 02)
00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01)
00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 01)
00:1c.1 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 2 (rev 01)
00:1c.2 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 3 (rev 01)
00:1d.0 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #1 (rev 01)
00:1d.1 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 01)
00:1d.2 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 01)
00:1d.3 USB controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 01)
00:1d.7 USB controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 01)
00:1f.2 IDE interface: Intel Corporation N10/ICH7 Family SATA Controller [IDE mode] (rev 01)
00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 01)
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)
04:02.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6306/7/8 [Fire II(M)] IEEE 1394 OHCI Controller (rev 46)
05:00.0 VGA compatible controller: NVIDIA Corporation G73 [GeForce 7300 GT] (rev a1)

This time I didn't have any problem with Internet. I've just started the Ubuntu and started Mozzila... But still on the status bar in the right upper corner of the desktop, when I click the network icon, the wired network menu is inactive.
Thanx

[spynappels]

Are you running server edition, or desktop edition?

If server edition with a desktop installed on top, Network manager is probably interfering with the config in /etc/network/interfaces

Can you confirm your setup?

[viktorjano]

Yes, it is a server distro with a desktop installed on top... So what do I do next... This time for example I started Ubuntu and there was active Internet connection...

[spynappels]

As you are using it as a server, I presume you want it to have a static IP address and control the networking from /etc/network/interfaces so if this is correct, you will need to uninstall network manager

sudo apt-get purge network-manager

and probably the Gnome Applet too to avoid annoying error messages

sudo apt-get purge nm-applet

You will also need to edit the /etc/network/interfaces file to reflect your desired setup.