Network Connection Present... But can't get internet....

little_cruden · 09-22-2007, 09:49 AM

Hey all,

I've jsut installed Ubunut 7.04 on my laptop and I'm a complete n00b to Linux, I've got the network connection present at about 56% signal strength and in the network section of System > Administration I've added the Preferred DNS and Alternative DNS that I use in windows to the DNS Server list. But I can't get on the net... Any one got any ideas?

shuuhen · 09-22-2007, 04:19 PM

Open a terminal and type 'ifconfig -a' (without quotes) and post the output here.

little_cruden · 09-23-2007, 05:46 AM

I couldn't get connected at all to my network this morning :( but heres what the output of the abov command:

eth0 Link encap:Ethernet HWaddr 00:03:0D:28:A8:1C
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:9 Base address:0x400

eth0:avah Link encap:Ethernet HWaddr 00:03:0D:28:A8:1C
inet addr:169.254.3.194 Bcast:169.254.255.255 Mask:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
Interrupt:9 Base address:0x400

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:14 errors:0 dropped:0 overruns:0 frame:0
TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1120 (1.0 KiB) TX bytes:1120 (1.0 KiB)

ra0 Link encap:Ethernet HWaddr 00:13:D3:71:9C:63
inet6 addr: fe80::213:d3ff:fe71:9c63/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:3398 errors:0 dropped:0 overruns:0 carrier:0
collisions:9 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:147627 (144.1 KiB)
Interrupt:9 Base address:0xc000

lensman3 · 10-20-2007, 09:04 PM

It doesn't look like your ra0 interface has an IP4 number (but it has an inet6 IP address). I don't run Ubunut, but on Redhat core 7, the command "/sbin/ifup ra0" would start the interface and connect the IP stack to the hardware. There were 3398 TX packets sent using inet6 IP address. So the interface may be working OK for IP6 but not for IP4. Does your wireless router support inet6 IP addresses? Because your card hasn't received any IP6 packets, I think your router only knows about IP4 addresses. All you may just have to reconfig the computers wireless card for IP4 on.

**Bartender** · 10-21-2007, 09:23 AM

Since lensman was capable of deciphering all that gobbledy-gook (I'm envious) and he mentioned IPV4 and IPV6, I'd suggest disabling IPV6 in Firefox. It's easy - google "disable IPV6 Firefox".
If Firefox suddenly works after you've disabled IPV6, then take a look at instructions for disabling IPV6 entirely. Here's a good one

http://neoaddict.wordpress.com/2007/...pv6-in-ubuntu/

If you've never done any terminal work this will be a little scary. Not because it's advanced or anything, just because you're not familiar with the CLI.

EDIT: Another thing to do is make an end-run around all the complications. Jack directly into your router or modem and try to get the internet working. Then work back from there. Wireless isn't exactly trouble-free in the Linux world and it'd be good to start with the basics.

lensman3 · 10-21-2007, 06:47 PM

To bartender:

It is easy

>>ra0 Link encap:Ethernet HWaddr 00:13:D3:71:9C:63
>>inet6 addr: fe80::213:d3ff:fe71:9c63/64 Scope:Link

inet6 address is the IPv6 IP number (There are six octets-numbers between the colons)

>>UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
The interface is up and running and is broadcasting that it is "alive". Though multicast is a mode that the ethernet protocol supports. MTU has to do with packet length.

>>RX packets:0 errors:0 dropped:0 overruns:0 frame:0
Zero packets have been received from the interface.

TX packets:3398 errors:0 dropped:0 overruns:0 carrier:0
3398 packets have been transmitted out the interface (they are going somewhere, or at least the computer is trying).

>>collisions:9 txqueuelen:1000
The collisions is confusing. Another card(?) is transmitting and the packets were interfered with in some way.

>>RX bytes:0 (0.0 b) TX bytes:147627 (144.1 KiB)
Zero bytes received and the 3393 packets transmitted were made up of 147627 bytes. This actually is probably DHCP 0.0.0.0 packets trying to contact a computer to give it a real
IP number.

>>Interrupt:9 Base address:0xc000
The wireless card is using Interrupt 9 and is using 0xc000 as the (?). The card probably communitcates with the kernel at that address. Take a look at the pseudo file located at
"/proc/interrupts", you'll see what interrupt resources your Linux is using.

**TheMatt** · 10-23-2007, 06:02 PM

It might also be useful to know what NIC is being used. Post the outputs of this:

Code:

lspci

lensman3 · 10-23-2007, 07:29 PM

/sbin/ifconfig gives the NIC on my machine.

If you "dmesg | more" from a command line window. You can see the NIC number that is reported when the kernel boots.

09-22-2007, 09:49 AM	#1 (permalink)
little_cruden Registered User Join Date: Jul 2007 Location: Aberdeen Posts: 32 OS: Windows Vista Premium	Network Connection Present... But can't get internet.... Hey all, I've jsut installed Ubunut 7.04 on my laptop and I'm a complete n00b to Linux, I've got the network connection present at about 56% signal strength and in the network section of System > Administration I've added the Preferred DNS and Alternative DNS that I use in windows to the DNS Server list. But I can't get on the net... Any one got any ideas?

09-22-2007, 04:19 PM	#2 (permalink)
shuuhen Manager Join Date: Sep 2004 Location: Colorado Posts: 988 OS: Mac OS 9.1, Mac OS X 10.5.8, WinXP Pro, FreeBSD 6.0, Gentoo Linux My System	Re: Network Connection Present... But can't get internet.... Open a terminal and type 'ifconfig -a' (without quotes) and post the output here. __________________ Has it been a few days since I replied to your thread? Don't panic! I'm a busy college student and may forget a post if I'm extra busy (or it might just take me a while to be able to do a decent reply). If you still need help and are awaiting my reply after a few days, PM me about it. When posting what errors you get, please give the full message. It makes helping you much easier.

09-23-2007, 05:46 AM	#3 (permalink)
little_cruden Registered User Join Date: Jul 2007 Location: Aberdeen Posts: 32 OS: Windows Vista Premium	Re: Network Connection Present... But can't get internet.... I couldn't get connected at all to my network this morning :( but heres what the output of the abov command: eth0 Link encap:Ethernet HWaddr 00:03:0D:28:A8:1C UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Interrupt:9 Base address:0x400 eth0:avah Link encap:Ethernet HWaddr 00:03:0D:28:A8:1C inet addr:169.254.3.194 Bcast:169.254.255.255 Mask:255.255.0.0 UP BROADCAST MULTICAST MTU:1500 Metric:1 Interrupt:9 Base address:0x400 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:14 errors:0 dropped:0 overruns:0 frame:0 TX packets:14 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:1120 (1.0 KiB) TX bytes:1120 (1.0 KiB) ra0 Link encap:Ethernet HWaddr 00:13:D3:71:9C:63 inet6 addr: fe80::213:d3ff:fe71:9c63/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:3398 errors:0 dropped:0 overruns:0 carrier:0 collisions:9 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:147627 (144.1 KiB) Interrupt:9 Base address:0xc000

10-20-2007, 09:04 PM	#4 (permalink)
lensman3 Registered User Join Date: Oct 2007 Location: Littleton, Colorado USA Posts: 470 OS: xp 64 sp2 Fedora Core 8 (vmware xp core 8 x32) Minix	Re: Network Connection Present... But can't get internet.... It doesn't look like your ra0 interface has an IP4 number (but it has an inet6 IP address). I don't run Ubunut, but on Redhat core 7, the command "/sbin/ifup ra0" would start the interface and connect the IP stack to the hardware. There were 3398 TX packets sent using inet6 IP address. So the interface may be working OK for IP6 but not for IP4. Does your wireless router support inet6 IP addresses? Because your card hasn't received any IP6 packets, I think your router only knows about IP4 addresses. All you may just have to reconfig the computers wireless card for IP4 on.

10-21-2007, 09:23 AM	#5 (permalink)
Bartender Mentally divergent Join Date: Jun 2005 Location: Chehalis, WA, USA Posts: 1,285 OS: W2K, Ubuntu 8.04	Re: Network Connection Present... But can't get internet.... Since lensman was capable of deciphering all that gobbledy-gook (I'm envious) and he mentioned IPV4 and IPV6, I'd suggest disabling IPV6 in Firefox. It's easy - google "disable IPV6 Firefox". If Firefox suddenly works after you've disabled IPV6, then take a look at instructions for disabling IPV6 entirely. Here's a good one http://neoaddict.wordpress.com/2007/...pv6-in-ubuntu/ If you've never done any terminal work this will be a little scary. Not because it's advanced or anything, just because you're not familiar with the CLI. EDIT: Another thing to do is make an end-run around all the complications. Jack directly into your router or modem and try to get the internet working. Then work back from there. Wireless isn't exactly trouble-free in the Linux world and it'd be good to start with the basics. Last edited by Bartender; 10-21-2007 at 09:26 AM.

10-21-2007, 06:47 PM	#6 (permalink)
lensman3 Registered User Join Date: Oct 2007 Location: Littleton, Colorado USA Posts: 470 OS: xp 64 sp2 Fedora Core 8 (vmware xp core 8 x32) Minix	Re: Network Connection Present... But can't get internet.... To bartender: It is easy >>ra0 Link encap:Ethernet HWaddr 00:13:D3:71:9C:63 >>inet6 addr: fe80::213:d3ff:fe71:9c63/64 Scope:Link inet6 address is the IPv6 IP number (There are six octets-numbers between the colons) >>UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 The interface is up and running and is broadcasting that it is "alive". Though multicast is a mode that the ethernet protocol supports. MTU has to do with packet length. >>RX packets:0 errors:0 dropped:0 overruns:0 frame:0 Zero packets have been received from the interface. TX packets:3398 errors:0 dropped:0 overruns:0 carrier:0 3398 packets have been transmitted out the interface (they are going somewhere, or at least the computer is trying). >>collisions:9 txqueuelen:1000 The collisions is confusing. Another card(?) is transmitting and the packets were interfered with in some way. >>RX bytes:0 (0.0 b) TX bytes:147627 (144.1 KiB) Zero bytes received and the 3393 packets transmitted were made up of 147627 bytes. This actually is probably DHCP 0.0.0.0 packets trying to contact a computer to give it a real IP number. >>Interrupt:9 Base address:0xc000 The wireless card is using Interrupt 9 and is using 0xc000 as the (?). The card probably communitcates with the kernel at that address. Take a look at the pseudo file located at "/proc/interrupts", you'll see what interrupt resources your Linux is using.

10-23-2007, 06:02 PM	#7 (permalink)
TheMatt TSF Enthusiast Join Date: May 2006 Location: Boston Posts: 13,701 OS: Win 3.1, 98, NT 4.0, XP Debian 4.0, Kubuntu 6.06 My System Blog Entries: 3	Re: Network Connection Present... But can't get internet.... It might also be useful to know what NIC is being used. Post the outputs of this: Code: lspci __________________ - Matt M - KB1OSC - Folding@Home 85015 [url="http://www.techsupportforum.com/hardware-support/"] If TSF has helped you, please consider donating. If I have stopped responding to a thread, feel free to send me a PM with a link to the thread. It is advisable to subscribe to threads so you will receive updates when replies are posted. You can subscribe to threads from the "Thread Tools" Menu. »Memtest86 »Prime95 »UBCD »SpeedFan »NHC Personal »Everest »Sandra »PC Wizard »RivaTuner »ATi Tool Click here for Useful Articles and Guides

10-23-2007, 07:29 PM	#8 (permalink)
lensman3 Registered User Join Date: Oct 2007 Location: Littleton, Colorado USA Posts: 470 OS: xp 64 sp2 Fedora Core 8 (vmware xp core 8 x32) Minix	Re: Network Connection Present... But can't get internet.... /sbin/ifconfig gives the NIC on my machine. If you "dmesg \| more" from a command line window. You can see the NIC number that is reported when the kernel boots.