It does have to be a pair of LocalTalk connector boxes with localtalk cabling between them, and ideally terminators on each end. A serial cable alas does not work. The little boxes contain an isolating transformer and turn the cabling into a bus.
Try changing your atalk.conf to say something like
Code:
eth0 -phase 2 -seed -net 20000-30000 -addr 20000.10
Code:
man atalkd
