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PPSP NAT traversal

PPSP NAT traversal. draft-li-ppsp-nat-traversal-00. Lichun Li , Jun Wang, Yu Meng {li.lichun1, wang.jun17,meng.yu}@ zte.com.cn. Terminology. STUN/TURN/proxy/relay peer special PPSP peers providing NAT traversal services User nodes or super nodes deployed by the operator STUN peer

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PPSP NAT traversal

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  1. PPSP NAT traversal

    draft-li-ppsp-nat-traversal-00 Lichun Li, Jun Wang, Yu Meng {li.lichun1, wang.jun17,meng.yu}@zte.com.cn
  2. Terminology STUN/TURN/proxy/relay peer special PPSP peers providing NAT traversal services User nodes or super nodes deployed by the operator STUN peer Provides STUN service TURN peer provides relay service in TURN layer application agnostic relay Proxy peer relays PPSP message in PPSP layer Application specific relay (similar to HTTP/SIP proxy, RELOAD peer) Relay peer A peer providing relay services: a TURN peer, proxy peer or both. Candidate (from ICE RFC5245) A transport address that is a potential point of contact for receipt of media. Relayed candidate (from ICE) A peer’s relayed candidate is the address assigned by its TURN server. Proxy candidate A peer's proxy candidate is the address of its serving proxy peer.
  3. PPSP network applying NAT traversal solution Peers may gather reflexive/relayed candidates from STUN/TURN servers Peer list contains candidates and peer ID.
  4. NAT traversal One-direction connectivity checks are PPSP checks or modified ICE checks Standard ICE connectivity checks require exchanging ICE parameters Optional ICE process for optimizing communication path
  5. Standard ICE Peers must exchange ICE parameters with offer/answer model ICE check connectivity with STUN binding messages. user name fragments and passwords exchanged in offer/answer phase Testing relayed candidate Add permission in TURN server
  6. One-direction ICE connectivity check without offer/answer Authentication change Don’t use STUN name fragment. Put the whole STUN user name & password in peer list A adds permission in B’s serving TURN peer by some means
  7. One-direction PPSP connectivity check Compared with ICE connectivity check, PPSP connectivity check can use PPSP’s own authentication method, and avoid the STUN/TURN authentication problem uses PPSP messages instead of STUN binding messages uses proxy candidate instead of relayed candidate
  8. Media Traversal of NAT ICE parameters can be exchanged with PPSP messages MediaAttach messages may be relayed by proxy/TURN peer
  9. Requirements for PPSP Tracker protocol MUST allow STUN/TURN/proxy ability report allow STUN/TURN/proxy peer list query allow reporting candidates contain candidates in peer list allow tracker instructing peer to work in NAT-traversal/no-NAT-traversal mode? Peer protocol MUST allow exchanging ICE parameters contain candidates in peer list If one-direction connectivity is checked in ICE layer, we need to modify ICE and TURN. In PPSP layer, peer protocol MUST allow connectivity check in PPSP layer allow PPSP message relay allow obtaining and maintaining proxy candidate allow STUN/TURN/proxy peer list exchange
  10. Next Steps Get more comments Refine NAT traversal solution Design NAT-traversal required messages in details
  11. Thank you! Questions?
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