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Network's freezing

Am having network problems on my laptop, the computer freezes when downloading or uploading a big file (over 500Mb) via scp or ftp to/form other computers in the network, other symptoms is that it freezes when executing tcpdump at shell console.
Any one can help ?

here's my lspci output :
0000:02:04.0 Ethernet controller: Atheros Communications, Inc.: Unknown device 001a (rev 01)
0000:02:06.0 CardBus bridge: Texas Instruments PCI1410 PC card Cardbus Controller (rev 02)
0000:02:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
0000:02:0a.0 FireWire (IEEE 1394): Texas Instruments TSB43AB21 IEEE-1394a-2000 Controller (PHY/Link)

I have 2 network adapters, eth and wifi.
How to know wich hardware is used as eth0 and ath0 (wifi)
Why is it saying 'Unknown device' ? lan and wifi are working fine.
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