To connect two machines to each other without a hub, you need a "cross-over" patch cable, which crosses the transmit and receive pairs, the orange and green pairs in normal wiring.
One End Cable The Other End TR+ pin 1 -------- pin 3 RCV+ TR- pin 2 -------- pin 6 RCV- RCV+ pin 3 -------- pin 1 TR+ RCV- pin 6 -------- pin 2 TR-
Alternatively, you can connect two wall jacks back-to-back, swapping the orange and green pairs, to make a "two-port hub". Then you can use straight-through patch cords between each of the machine and one of the "hub" jacks. This is used to connect two 10baseT transceivers directly together, as in connecting the transceiver on your Mac to a transceiver on another Mac. I suppose you could connect a Mac to a PC, but why would anyone want to?. :-)
One more excellent suggestion was contributed by firstname.lastname@example.org (Isaac Wingfield). Make the crossover cable using a very short cable with a standard RJ-45 plug pinout on one end and a wall jack, cross-wired, on the other end. Then you use a single standard straight-through patch cord. Using this small cross-over "extension cord" prevents having two kinds of patch cords around and makes it very obvious what it is.
WITH THE CLIP SIDE FACING DOWN! (Note: pins 1,2,3, and 6 are the only ones used.)
Complete Wiring for Cross-Over cable: On one end The Other end Pin Wire color Pin 1 white/orange 3 2 orange/white 6 3 white/green 1 4 blue/white 4 5 white/blue 5 6 green/white 2 7 white/brown 7 8 brown/white 8Tip: After crimping with my tool the clip was flattened and did not click in when inserted in the network card. A GENTLE lifting with my thumbnail solved the problem.
1. Dial-Up Adapter 2. NE2000 Compatible Driver Type Enhanced mode (32 and 16 bit) NDIS Bindings IPX/SPX-... checked NetBEUI-... checked 3. IPX/SPX-compatible Protocol --- NE2000 Compatible Bindings same as 2 Advanced defaults and KEY setting "Set this protocol to be default protocol" NOT checked NetBIOS "I want to enable NetBIOS over IPS/SPX" NOT checked 4. NetBEUI -- NE2000 Compatible Bindings same as 2 Advanced defaults and "Set this protocol to be the default protocol" NOT checked 5. TCP/IP -- Dial-Up Adapter 6. File and Printer sharing for Microsoft NetworksThe above works, with a peer-to-peer two-computer network, which operates fine with 10base-T. (COAX cable does not require such wiring and permits more than two computers to be installed without a hub.) I have experienced one quirk, which may require a different setting. When I send files back and forth they almost always arrive intact. The one exception is that twice I've sent a version of Netscape that I downloaded as a self-extracting .exe and had it fail on the receiving end. That is, it extracts and sets up normally on the computer on which it was originally downloaded, but not on the second computer after "copying" it to a directory on that second computer via my network. Perhaps a "default" in number 2 or 3 above needs to be changed.
For any Windows users who might be curious, here's how you do the same thing on a Macintosh. Click Here