Peer%20to%20Peer%20Discovery

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Peer to Peer Discovery

• Nate Thrasher

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Peer to Peer Discovery

• 2 Basic Categories
• Hardware Discovery
• Information Discovery
• JXTA (http//www.jxta.org) has 6 protocols
• http//spec.jxta.org/nonav/v1.0/docbook/JXTAProtoc
  ols.html
• ERP (Endpoint Routing Protocol)

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Peer to Peer Discovery

• Hardware Discovery
• Discovery of nodes in local network
• Discovery of nodes outside of local network
  (through firewalls/proxies)
• Information Discovery
• Advertise local, discoverable information.
• Submit a query to any node and have it propagate
  throughout the peer network and return a result.

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Peer to Peer Discovery

• Hardware Discovery
• Multicast Communication
• Used for LAN discovery
• Used by all nodes in P2P network
• HTTP Communication
• Used for discovery outside of LAN
• Performed by special Router node

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Peer to Peer Discovery

• Multicast Communication
• Packets exchanged on multicast group containing
  IP/port available for direct connection.
• Router nodes store these for reference when
  external router nodes ask to send a packet to a
  local node.
• Every node on a local network should maintain a
  list of every other node.

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Peer to Peer Discovery

• HTTP Communication
• Used by router nodes to communicate through a
  firewall/proxy.
• Messages are wrapped in an http packet and sent
  through the firewall (assuming it allows http
  communication on a standard port).
• HTTP packets are automatically routed to the
  client from which the request was made.
• The packet contains information that tells the
  router node where it needs to be sent.

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Peer to Peer Discovery

• Hardware Discovery

NODE
NODE
Multicast
Multicast
ROUTER NODE
ROUTER NODE
NODE
HTTP
NODE
Firewall
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Peer to Peer Discovery

• My Implementation
• Multicast Only
• Areas for Improvement
• Add HTTP
• Add some kind of Information discovery