[ns] Question about Node receive packet

[rubenjy]

when agent send packet, uses target_->recv(Packet)
then uses classifier to sent it in classifier::recv(....).
in classifier::recv(....) use node->recv(p,h) send out packet
but the node->recv(p,h) of Object.cc is Packet::free(p).

i don't know how packet send out?
and how node receive packet, then send it to agent? 
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