I am reading the Tor: The Second-Generation Onion Router article and my question is that how TOR extends circuit to a third node?
On page 7 of the article,left column, it says:
To extend the circuit to a third node or beyond, Alice proceeds as above, always telling the last node in the circuit to extend one hop further.
Does Alice talk to OR2 directly to extend the node or it talks to OR2 through OR1?
If Alice talks to OR2 through OR1, then what commands should she use? As we know extend command was used to extend circuit from OR1 to OR2 and seems it can't be used twice.