using bootnet with a NE2000 CARD ISA, did not allow to specify an IO PORT for the card, so, install REDHAT 6.1 Over the Network using a NE2000 ISA CARD IS NOT POSSIBLE
msw is wnjoying these types of bugs :-)
RH 6.1 BOOTNET using NE2000 ISA Card, THERE IS IO PORT Option Use the additional option or something similar .... it just worked for me but it was a pain to figure out what the IO was
*** This bug has been marked as a duplicate of 5521 ***