TCP/IP Over Serial

[k4lmp]

Does anybody know if the Amiga is capable of doing TCP/IP over serial?  I know it might be only slightly, if any faster than a dial-up connection, but is it doable.  I have read about using a C64 user port and connecting to a serial port on a PC, and running a server application that converts the TCP/IP and sends it over the serial connection.  I am just wondering if I could do this with my A2000.  There is an ethernet card on Ebay, but, it is very expensive.  This would also give me another thing to mess around with , and if doable, another option for everyone without buying a high dollar ethernet card.  

Thanks,
Jeff

[k4lmp]

Anybody know of a good serial driver to replace serial.device to speed up the serial port?  Mine instead of the next step above 19,200 being 38,400, it is 31, some odd number. and that is it.  If there is a better one, can I rename the file serial.device?