buy a network card that has dos drivers, it'll probably need qemm or something similar because it'll eat lots of memory. then setup a tcp stack or a mini windows network stack
try this
http://members.iinet.net.au/~bdriver/bootdisk/
you'll probably need to cut down the size of the disk if you dont have a hard drive or extra floppy on it, plus you can always copy over the floppy to the hard drive and modify it ther.e