Wired network-connection problems solved ... but why?

[Stephen R Laniel]

I couldn't connect to my company's wired-Ethernet network
yesterday or this morning using Feisty, when I'd never had
any problems with Edgy and had in fact had no problems with
Feisty until yesterday. (I upgraded to Feisty on the 19th.)

After doing ifup eth0/ifdown eth0 a million times, scouring
the Net (from a working computer), doing
/etc/init.d/networking restart a few times, rebooting,
trying things like disabling avahi-daemon in
/etc/default/avahi-daemon and much besides, it seems that
this did the trick:

sudo rmmod e1000
sudo modprobe e1000
sudo ifdown eth0
sudo dhclient eth0

Why should that work?

a) Shouldn't Feisty already know to load e1000, given what
   lspci (below) says?
b) Shouldn't ifdown/ifup already have done 'dhclient eth0'?

I'll now do a reboot, followed by the last three of the
above four steps. (I believe e1000 is not getting loaded by
default, so the first is superfluous.) If I'm right,

a) the network won't be up just after the reboot, but
b) it will come up after those three steps.

What's the deal? Why doesn't Feisty get this right?

00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express Processor to DRAM Controller (rev 03)
00:01.0 PCI bridge: Intel Corporation Mobile 915GM/PM Express PCI Express Root Port (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 1 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 3 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #3 (rev 03)
00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #4 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev d3)
00:1e.2 Multimedia audio controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Audio Controller (rev 03)
00:1e.3 Modem: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Modem Controller (rev 03)
00:1f.0 ISA bridge: Intel Corporation 82801FBM (ICH6M) LPC Interface Bridge (rev 03)
00:1f.2 IDE interface: Intel Corporation 82801FBM (ICH6M) SATA Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus Controller (rev 03)
01:00.0 VGA compatible controller: ATI Technologies Inc M22 [Radeon Mobility M300]
02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5751M Gigabit Ethernet PCI Express (rev 11)
0b:00.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev 8d)
0b:02.0 Network controller: Intel Corporation PRO/Wireless 2915ABG Network Connection (rev 05)

-- 
Stephen R. Laniel
steve at laniels.org
Cell: +(617) 308-5571
http://laniels.org/
PGP key: http://laniels.org/slaniel.key
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 189 bytes
Desc: Digital signature
URL: <https://lists.ubuntu.com/archives/ubuntu-users/attachments/20070503/bf1083ae/attachment.sig>