Aha! The problem is that my systems somehow fails to initialize the card
upon power-on. It start to work after consequent warm reboot. After
powering it on I have:

$ lspci -vv
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E PCI 
Express Fast Ethernet controller (rev ff) (prog-if ff)
        !!! Unknown header type 7f

$ reboot now

$ lspci -vv

01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E PCI 
Express Fast Ethernet controller (rev 02)
        Subsystem: Intel Corporation Unknown device 0001
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR-
        Latency: 0, Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 2300
        Region 0: I/O ports at 1000 [size=256]
        Region 2: Memory at 48100000 (64-bit, non-prefetchable) [size=4K]
        Region 4: Memory at 48000000 (64-bit, prefetchable) [size=64K]
        Expansion ROM at 48020000 [disabled] [size=128K]
        Capabilities: [40] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA 
PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [50] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 
Enable+
                Address: 00000000fee0300c  Data: 4191
        Capabilities: [70] Express Endpoint IRQ 1
                Device: Supported: MaxPayload 256 bytes, PhantFunc 0, ExtTag-
                Device: Latency L0s <512ns, L1 <8us
                Device: AtnBtn- AtnInd- PwrInd-
                Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
                Device: RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
                Device: MaxPayload 128 bytes, MaxReadReq 512 bytes
                Link: Supported Speed 2.5Gb/s, Width x1, ASPM L0s L1, Port 0
                Link: Latency L0s <512ns, L1 <64us
                Link: ASPM Disabled RCB 64 bytes CommClk- ExtSynch-
                Link: Speed 2.5Gb/s, Width x1
        Capabilities: [ac] MSI-X: Enable- Mask- TabSize=2
                Vector table: BAR=4 offset=00000000
                PBA: BAR=4 offset=00000800
        Capabilities: [cc] Vital Product Data

It looks like BIOS issue to me. There is a new BIOS available (LF0103P)
which does not seem to have even this issue. It works for me with this
new one - try it and let us know.

-- 
RTL8102EL / Ubuntu 8.04 intermitent failure
https://bugs.launchpad.net/bugs/240470
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