Unstable internet

[lhansen]

Hi. Like many people, I recently upgraded to intrepid and my internet died. My symptoms don't seem to be consistent, and I need some help troubleshooting. I have tried following several other threads, but none seem to have all of these problems.

At first, wireless on my home network worked perfectly. Now it connects, but there appears to be no data transfer (I ping google.com with no response). At first, I could not get an ethernet connection to work on my home router, but now it works perfectly (how I am able to post this). An internet connection at school has not worked since the upgrade. I can connect to the unprotected network, but again there appears to be no data transfer. I cannot establish an ethernet connection at school.

Here is my ifconfig with ethernet at home
br0 Link encap:Ethernet HWaddr 00:12:f0:41:35:22
inet addr:192.168.1.102 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::212:f0ff:fe41:3522/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
RX packets:5853 errors:0 dropped:0 overruns:0 frame:0
TX packets:5999 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1099494 (1.0 MB) TX bytes:1061438 (1.0 MB)

eth1 Link encap:Ethernet HWaddr 00:12:f0:41:35:22
inet addr:192.168.1.102 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::212:f0ff:fe41:3522/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:43 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:5815 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1353340 (1.3 MB) TX bytes:165576 (165.5 KB)
Interrupt:17 Base address:0x2000 Memory:dfdfd000-dfdfdfff

eth2 Link encap:Ethernet HWaddr 00:11:43:72:5f:de
inet addr:192.168.1.104 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::211:43ff:fe72:5fde/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:12409 errors:2 dropped:2 overruns:0 frame:0
TX packets:8692 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:13345149 (13.3 MB) TX bytes:1068505 (1.0 MB)
Interrupt:18

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:2420 errors:0 dropped:0 overruns:0 frame:0
TX packets:2420 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:310904 (310.9 KB) TX bytes:310904 (310.9 KB)

tap0 Link encap:Ethernet HWaddr 0a:e6:95:8b:e6:00
inet addr:192.168.187.1 Bcast:192.168.187.255 Mask:255.255.255.0
inet6 addr: fe80::8e6:95ff:fe8b:e600/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:9215 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)



Here is my ifconfig with wireless at home
br0 Link encap:Ethernet HWaddr 00:12:f0:41:35:22
inet addr:192.168.1.102 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::212:f0ff:fe41:3522/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
RX packets:5826 errors:0 dropped:0 overruns:0 frame:0
TX packets:5999 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1094084 (1.0 MB) TX bytes:1061438 (1.0 MB)

eth1 Link encap:Ethernet HWaddr 00:12:f0:41:35:22
inet addr:192.168.1.102 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::212:f0ff:fe41:3522/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:91 errors:0 dropped:0 overruns:0 frame:0
TX packets:39 errors:0 dropped:5815 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1344833 (1.3 MB) TX bytes:164856 (164.8 KB)
Interrupt:17 Base address:0x2000 Memory:dfdfd000-dfdfdfff

eth2 Link encap:Ethernet HWaddr 00:11:43:72:5f:de
inet6 addr: fe80::211:43ff:fe72:5fde/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:12378 errors:1 dropped:1 overruns:0 frame:0
TX packets:8644 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:13336539 (13.3 MB) TX bytes:1060262 (1.0 MB)
Interrupt:18

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:2407 errors:0 dropped:0 overruns:0 frame:0
TX packets:2407 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:309627 (309.6 KB) TX bytes:309627 (309.6 KB)

tap0 Link encap:Ethernet HWaddr 0a:e6:95:8b:e6:00
inet addr:192.168.187.1 Bcast:192.168.187.255 Mask:255.255.255.0
inet6 addr: fe80::8e6:95ff:fe8b:e600/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:9200 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)


and iwconfig
lo no wireless extensions.

eth2 no wireless extensions.

eth1 IEEE 802.11g ESSID:"noashark"
Mode:Managed Frequency:2.437 GHz Access Point: 00:1A:70:EE:0E:00
Bit Rate:54 Mb/s Tx-Power=20 dBm Sensitivity=8/0
Retry limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=99/100 Signal level=-21 dBm Noise level=-91 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

pan0 no wireless extensions.

tap0 no wireless extensions.

br0 no wireless extensions.


Here is the relevant line from lspci
03:03.0 Network controller: Intel Corporation PRO/Wireless 2915ABG [Calexico2] Network Connection (rev 05)

If anyone has any suggestions, it would be greatly appreciated. Thanks.

[lhansen]

A quick update. I let my computer sit with a wireless connection at home for about an hour. At first there was no data transfer, but after an hour everything worked perfectly. Both ifconfig and iwconfig looked the same.

When my computer initially connects and there is no data transfer, there is one interesting piece of evidence. As I watch a conky graph of download rate, I see three very small spikes. These repeat in packets of three indefinitely. After I let the computer sit for an hour, this behavior stops, and the internet works.

Can anyone tell me what is going on?

[lhansen]

Just in case this helps, here is the output of

lshw -C network

WARNING: you should run this program as super-user.
*-network:0
description: Ethernet interface
product: BCM4401-B0 100Base-TX
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: eth2
version: 02
serial: 00:11:43:72:5f:de
width: 32 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical
configuration: broadcast=yes driver=b44 driverversion=2.0 latency=64 module=ssb multicast=yes
*-network:1
description: Wireless interface
product: PRO/Wireless 2915ABG [Calexico2] Network Connection
vendor: Intel Corporation
physical id: 3
bus info: pci@0000:03:03.0
logical name: eth1
version: 05
serial: 00:12:f0:41:35:22
width: 32 bits
clock: 33MHz
capabilities: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=ipw2200 driverversion=1.2.2kmprq firmware=ABG:9.0.2.6 (Mar 22 2005) ip=192.168.1.102 latency=64 maxlatency=24 mingnt=3 module=ipw2200 multicast=yes promiscuous=yes wireless=IEEE 802.11g
*-network:0 DISABLED
description: Ethernet interface
physical id: 1
logical name: pan0
serial: f2:f8:df:fa:e6:fb
capabilities: ethernet physical
configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A multicast=yes
*-network:1
description: Ethernet interface
physical id: 2
logical name: tap0
serial: ee:c9:e7:e1:a5:34
capabilities: ethernet physical
configuration: broadcast=yes driver=tun driverversion=1.6 firmware=N/A ip=192.168.187.1 multicast=yes
*-network:2
description: Ethernet interface
physical id: 3
logical name: br0
serial: 00:12:f0:41:35:22
capabilities: ethernet physical
configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A ip=192.168.1.102 multicast=yes

[superprash2003]

what is br0?? br0 and eth1 have same ip!!!do you use all those interfaces?

[lhansen]

The br0 is a bridged interface that I originally setup while configuring an XP virtual machine. In truth I don't really know how the bridged interface works, and I rather get rid of it to avoid confusion. If you have any thoughts on how to remove it that would be great.

[superprash2003]

just type sudo ifdown br0 .. that should be enough.. have you sorted out the ipconflict..

[lhansen]

That command takes down br0, but it doesn't seem to fix any symptoms. Currently I'm at school having the same problem. I can connect, there appears to be data being downloaded (according to system monitor), but I can't connect or ping anything. My school does have one of those security setups where you are directed to a login page. However, I am never directed there. Firefox just keeps "Looking up" whatever page I sent it to.

[superprash2003]

it could be a DNS issue... in your terminal type cat /etc/resolv.conf and post output..

[lhansen]

Thanks for your help. I'm not sure how to interpret this output.

lhansen@lars:~$ cat /etc/resolv.conf
# Generated by NetworkManager
domain umn.edu
search umn.edu
nameserver 128.101.101.101
nameserver 134.84.84.84