Thanks for your answer.
Here are more details
$uname -a
Linux cfp6018 2.6.20-15-generic #2 SMP Sun Apr 15 07:36:31 UTC 2007 i686
GNU/Linux
Ethernet info in lspci output (see attached for complete output)
02:0c.0 Ethernet controller [0200]: Intel Corporation 82540EM Gigabit Ethernet
Controller [8086:100e] (rev 02)
Subsystem: Dell Unknown device [1028:0156]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr-
Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (63750ns min), Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 18
Region 0: Memory at fcee0000 (32-bit, non-prefetchable) [size=128K]
Region 2: I/O ports at dcc0 [size=64]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [e4] PCI-X non-bridge device
Command: DPERE- ERO+ RBC=512 OST=1
Status: Dev=00:00.0 64bit- 133MHz- SCD- USC- DC=simple
DMMRBC=2048 DMOST=1 DMCRS=16 RSCEM- 266MHz- 533MHz-
Capabilities: [f0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0
Enable-
Address: 0000000000000000 Data: 0000
** Attachment added: "output of sudo lspci -vvnn"
http://librarian.launchpad.net/7339191/lspci-vvnn.log
--
Network is unstable with Intel 82540EM ethernet card
https://bugs.launchpad.net/bugs/106958
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Bugs, which is the bug contact for Ubuntu.
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