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NSIS: A New Extensible IP Signaling Protocol Suite

NSIS: A New Extensible IP Signaling Protocol Suite. Myungchul Kim mckim@icu.ac.kr Tel: 042-866-6127. by X. Fu, H. Schulzrinne, et al., IEEE Communications Magazine, Oct. 2005. Introduction

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NSIS: A New Extensible IP Signaling Protocol Suite

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  1. NSIS: A New Extensible IP Signaling Protocol Suite Myungchul Kim mckim@icu.ac.kr Tel: 042-866-6127

  2. by X. Fu, H. Schulzrinne, et al., IEEE Communications Magazine, Oct. 2005. • Introduction • Signaling in communication networks is defined as the exchange of information between nodes to establish, maintain, and remove control state in network nodes. • Signaling System 7 (SS7) • Examples • Reserving resources for QoS guarantees • Configuring firewall pinholes and network address translator (NAT) binding • Diagnosing path status • RSVP • NSIS (Next Steps in Signaling) • The lower layer provides a generic transport service for different signaling applications (General Internet Signaling Transport, GIST) • The upper layers: QoS signaling, firewall and NAT control.

  3. Soft state signaling and the RSVP signaling protocol • Hard state: installed upon receipt of a setup message and removed only upon receipt of an explicit tear down message. • Soft state: nonpermanet control state will expire unless refreshed. • Fig 1

  4. RSVP • Many-to-many multicast QoS reservation • Per-flow-based • Periodic refreshes • RSVP key problems • Not support mobile nodes • UDP for transport mechanism • Discovery and signaling message delivery are combined into a single protocol step. -> not provide a solid security framework. • Design principles of NSIS • NSIS initiator (NI), NSIS forwarder (NF), NSIS responder (NR) • Fig 2

  5. All NSIS nodes necessarily do not support all signaling applications. • Separating signaling message transport from signaling applications • NSIS Transport Layer Protocol (NTLP) • NSIS Signaling Layer Protocols (NSLPs) • See Figure 3 • Decoupling of discovery and transport of signaling messages • Introduction of a session identifier • Flow identifier vs session identifier • Mobility • Multihoming • Tunneling and IPv4/v6 traversal • Support for signaling to hosts, networks, and proxies

  6. Fig 3

  7. GIST: General Internet Signaling Transport Protocol • NSIS Transport Layer Protocol: NTLP • Datagram mode (UDP), Connection mode (TCP) • IPsec, TLS • The QoS signaling application protocol in NSIS • QoS NSLP can signal for any QoS model (e.g., IntServ or DiffServ) • QSPEC -> RMF -> policy control and admission control

  8. Fig 4

  9. Sender-initiated and receiver-initiated • Fig 5

  10. Security consideration for NSIS • Security protection for GIST in connection mode • Authentication of the two neighboring protocol peers • Security association establishment to provide integrity, confidentiality, and replay protection for signaling message exchanged between these entities. • Denial of service protection • Authorization of the signaling peers • Some security protection for the discovery mechanism

  11. Comparison between RSVP and NSIS signaling • Table 1

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