Public bug reported:
I have spent hours trying out dozens of solutions from the ubuntuforums
and askubuntu, nothing seems to help. Ethernet cable and plug (in office
wall with many ethernet plugs available) switched to test if this is the
problem.
My internet connection sporadically and regularly drops. Sometimes it is
that webpages take a long time to load, or never do. Sometimes this can
be fixed by reloading the page, sometimes this does nothing. In those
cases the only solution is to either disable and enable networking or
click on the supposedly connected wired connection I am using to get it
to reconnect manually. In both these cases the connection is usually
back within 5 seconds (very rarely I have to do this twice).
I have reinstalled network manager and resolvconf, I have disbled ipv6,
I have edited NetworkManager.conf (along with a few other things that
all don't seem to work). Generally the connection is stable for a long
time following a reboot, but once it starts dropping out, it can stay
stable for a half hour, or 2 minutes, and there seems to be no way to
know.
Sometimes trying to load a page or an element in a page will trigger
network manager to react to the loss of connection. What I mean is that
in this case both skype and dropbox show that they have gone offline,
and the network manager icon appears to look for a connection. This then
happens within 5 seconds (as when I do this manually) and the connection
is back. Again, this then can hold for a half hour or only 2 minutes, or
anything in between.
#### sudo ifconfig -a ####
eth0 Link encap:Ethernet HWaddr 00:1e:c9:3e:33:d6
inet addr:172.16.10.253 Bcast:172.16.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
RX packets:204291 errors:0 dropped:0 overruns:0 frame:0
TX packets:73962 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:126731107 (126.7 MB) TX bytes:18598744 (18.5 MB)
Interrupt:17
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:3340 errors:0 dropped:0 overruns:0 frame:0
TX packets:3340 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:245691 (245.6 KB) TX bytes:245691 (245.6 KB)
#### lspci ####
00:00.0 Host bridge: Intel Corporation 82X38/X48 Express DRAM Controller
00:01.0 PCI bridge: Intel Corporation 82X38/X48 Express Host-Primary PCI
Express Bridge
00:06.0 PCI bridge: Intel Corporation 82X38/X48 Express Host-Secondary PCI
Express Bridge
00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #4 (rev 02)
00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #5 (rev 02)
00:1a.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #6 (rev 02)
00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1
(rev 02)
00:1c.5 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6
(rev 02)
00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #2 (rev 02)
00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #3 (rev 02)
00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 92)
00:1f.0 ISA bridge: Intel Corporation 82801IR (ICH9R) LPC Interface Controller
(rev 02)
00:1f.2 SATA controller: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port
SATA Controller [AHCI mode] (rev 02)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 02)
01:00.0 VGA compatible controller: NVIDIA Corporation G84 [Quadro FX 570] (rev
a1)
04:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5754 Gigabit
Ethernet PCI Express (rev 02)
05:04.0 FireWire (IEEE 1394): LSI Corporation FW322/323 (rev 61)
#### cat /etc/network/interfaces ####
auto lo
iface lo inet loopback
#### dmesg | grep -e eth0 -e bcm ####
[ 2.833361] tg3 0000:04:00.0: eth0: Tigon3 [partno(BCM95754) rev b002] (PCI
Express) MAC address 00:1e:c9:3e:33:d6
[ 2.833365] tg3 0000:04:00.0: eth0: attached PHY is 5787 (10/100/1000Base-T
Ethernet) (WireSpeed[1], EEE[0])
[ 2.833368] tg3 0000:04:00.0: eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0]
TSOcap[1]
[ 2.833371] tg3 0000:04:00.0: eth0: dma_rwctrl[76180000] dma_mask[64-bit]
[ 11.257451] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 20.902607] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 23.935637] tg3 0000:04:00.0: eth0: Link is up at 1000 Mbps, full duplex
[ 23.935641] tg3 0000:04:00.0: eth0: Flow control is off for TX and off for RX
[ 23.935774] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 4720.680698] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 4723.084274] tg3 0000:04:00.0: eth0: Link is up at 1000 Mbps, full duplex
[ 4723.084278] tg3 0000:04:00.0: eth0: Flow control is off for TX and off for RX
[ 4723.084408] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: precise
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https://bugs.launchpad.net/bugs/1086708
Title:
Intermittent ethernet internet connection Ubuntu 12.04 (networking
using the tg3 driver)
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