I found several guidelines for building a passive ethernet hub, mostly quoting this. The guide specifies which diodes to use, but I cannot find them anywhere. What are the parameters I should search for to find a suitable replacement?
The diodes he's chosesn are massively over-specified for the task 10-base-2 is only 20 MHz and those are 1GHz parts. ordinary signal diodes like 1N914 or 1N4148 should work just fine.
it'd probably even work with resistors instead of the diodes, somewhere 22 to 47 ohm feels about right.