Beginner's question

To fond out what ethernet device you have:

lspci -n
lspci -v

That works for PCI cards and also for PCMCIA (provided the pcmcia bus driver is loaded). The first command gives you the BusID and a text description taken from the device itself. The second command gives you the BusID and the VendorID:ProductID pair (and a few mostly irrelevant details). It is the VendorID:ProductID pair you need to identify the device. You can use that pair in 'google' to try to find posts about drivers. If you have the kernel source you can use 'fgrep' to try to locate these numbers in the code. If you just can't find it in the source then there is either no driver or the driver has to be obtained somewhere else.

you can aslo go tho networking in you menu bar
it show you your nic card settings and allow you to change you tcp/ip settings not really show you the driver but it displays the name of the card and if its enabled