When is the 'MyFamily' setting unnecessary?

[tor_ml]

Hi,

I'm curious in which cases tor would _never_ use certain nodes to create 
one circuit and therefore makes the 'MyFamily' setting unnecessary.

I heard only of one "rule" (I guess on this list but I'm not sure):
- tor would not use nodes within the same /16 network to create a circuit

are there more such rules?
***********************************************************************
To unsubscribe, send an e-mail to majordomo at torproject.org with
unsubscribe or-talk    in the body. http://archives.seul.org/or/talk/