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  • UDP port 12345: for peer-to-server communication.
  • TCP port 1515: for server monitoring messages.
  • TCP port 1516 + i: for server-to-server communication, where i is the server index (i  = 0, 1, 2, ..., I-1,  I is the total number of replicated servers.
  • TCP port 8888 and 8898: for peer-to-peer communication.
  • TCP port 54321 and 54331: for streaming from peer to media player (on the same workstation).
  • UDP port 61874: for peer-to-peer and peer-to-server ping packets. This is to measure route hop counts and round-trip delay.
  • UDP port 30000-65534: random ports for peer-to-peer and peer-to-server traceroute packets. This is to identify the packet routes among these machines. Both ping and traceroute packets are useful in optimizing the performance of pCDN networks.