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dmesg | grep eth0
And you should see something like this:
bash-2.05a$ dmesg | grep eth0
eth0: RealTek RTL8139 Fast Ethernet at 0xe092ff00, 00:50:ba:d6:44:d0, IRQ 4
eth0: Identified 8139 chip type 'RTL-8139B'
eth0: Setting 100mbps full-duplex based on auto-negotiated partner ability 45e1.
eth0: Setting 100mbps full-duplex based on auto-negotiated partner ability 45e1.
bash-2.05a$ eth0: RealTek RTL8139 Fast Ethernet at 0xe092ff00, 00:50:ba:d6:44:d0, IRQ 4
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