Extra Machine-to-machine ethernet connection?

[getrhd terrorist math ntu edu tw]

Hello, ladies and gentlemen:

	I am running Red Hat on two dual PII machines.  Currently they
sit side-by-side, both connected to a 10BaseT LAN network (well, it's
not a rich department!).  I am thinking about using NFS on the larger
(better-equipped) of the two machines and mount some directories.  I'm
also transferring files between the two machines constantly.  Unlucky,
since the 10BaseT LAN does not seem very well equipped to take such a
load.  I have a spare 3C905B 10/100 NIC, and am thinking of buying an
extra 10/100 NIC and making a machine-to-machine direct connection.

	What equipment do I need?  I know there is something called a
Null Modem Cable that I can use for a direct socket-to-socket 10 Mb/s
connection between two 10Mbps NICs.  Is it doable for 100Mb/s?  Would
a simple 10 Mb/s connection suffice if I am running PVM?

	Thanks for any pointers and info.

						B.Y.