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you might have to add both hostname/ip cominations to each /etc/hosts file, i.e.

192.168.0.80    machine1
192.168.0.79    machine2

The problem could be that machine1 refers to 127.0.0.1 / 127.0.0.1 in machine1's hosts file. Local communication works, but when roscore tries to resolve the address when negotiating a connection between machine1 and machine2, it would still report 127.0.0.1 ...

Hope that helps! Markus