[chord] node how to join p2p network in real world

[william]

Hi,dear p2per
  I have question that in real world,how the node join p2p network?I
think it should  send some broadcast information to network?But the
broadcast information are limited in LAN,can not contraverse the
gateway?But if in LAN,no node,how the node join to fix on its
location.
  I think meet first node which in the p2p network is a key step in
joining procedure.So I want to know the node's join procedure in real
p2p network.
  I need help,thanks a lot.

Sincerely
William
6.15