Next Steps In Signaling (NSIS) in the IETF Roland Bless - - PDF document

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Apr 24, 2023 187 likes •242 views

Next Steps In Signaling (NSIS) in the IETF Roland Bless bless@tm.uka.de Institute of Telematics, University of Karlsruhe What is Signaling? Signaling exchange of (control) data between nodes to install, manage, or delete states in them

SLIDE 1

Next Steps In Signaling (NSIS) in the IETF

Roland Bless

bless@tm.uka.de Institute of Telematics, University of Karlsruhe

NSIS - EuroView 2008 Roland Bless

Institut für Telematik Universität Karlsruhe (TH) www.tm.uka.de

What is Signaling? Signaling

exchange of (control) data between nodes to install, manage, or delete states in them happens in the „control plane“

Examples

Classical: SS7 – signaling for circuit switched telephone network Admission control and resource reservation for QoS (Quality-of-Service) support RSVP Dynamic configuration of firewall pinholes or NAT bindings Dynamic activation of measurement points

SLIDE 2

NSIS - EuroView 2008 Roland Bless

Institut für Telematik Universität Karlsruhe (TH) www.tm.uka.de

Next Steps in Signaling (NSIS) IETF Working Group (created 2001) controls resources in IP layer (e.g., router) Goals: (at first mainly QoS signaling in focus) Interworking between different QoS solutions Simplified solution for QoS signaling Support of mobility and wireless next generation networks NSIS Requirements [RFC 3726] (2004)

NSIS - EuroView 2008 Roland Bless

Institut für Telematik Universität Karlsruhe (TH) www.tm.uka.de

NSIS Approach Lessons learned from RSVP

ffered no efficient support of unicast reservations

used for various unforeseen purposes / signaling applications mobility support required

Assumptions

path-coupled signaling: signaling messages follow data path normal routing (no QoS routing or load balancing etc.) no multicast support considered (at first)

SLIDE 3

NSIS - EuroView 2008 Roland Bless

Institut für Telematik Universität Karlsruhe (TH) www.tm.uka.de

NSIS – Two Layer Split

Signaling Message Transport Signaling Message Transport TLS UDP UDP TCP TCP SCTP SCTP DCCP DCCP IPsec IPv4 or IPv6 IPv4 or IPv6 Signaling Application 1 (QoS) Signaling Application 1 (QoS) Signaling Application 2 (NAT FW) Signaling Application 2 (NAT FW) NSIS Signaling Layer Protocol (NSLP) NSIS Transport Layer Protocol (NTLP)

Routing of flow-based signaling messages next node discovery signaling message transport allows reuse of existing transport and security protocols Application specific signaling protocol logic

NSIS - EuroView 2008 Roland Bless

Institut für Telematik Universität Karlsruhe (TH) www.tm.uka.de

NTLP: GIST Features

General Internet Signaling Transport (GIST) Protocol Common signaling transport service for different signaling applications Simple message-by-message transport service

conveyed contents are transparent for GIST does not handle signaling application state

Discovery and management of signaling message routes Provides Session-ID – supports mobility Datagram or Connection Mode for message transfer

Establishment of signaling message associations (soft state)

Simple protection against DoS

SLIDE 4

NSIS - EuroView 2008 Roland Bless

Institut für Telematik Universität Karlsruhe (TH) www.tm.uka.de

NTLP/NSLP Scenario

Host GIST NSLP A GIST NSLP A Host GIST NSLP B GIST NSLP A/B GIST NSLP A/B Initiator Forwarder Forwarder Responder Router 1 Router 2 Router 3 Router 4

not NSIS aware supports

nly signaling

application B

NSIS - EuroView 2008 Roland Bless

Institut für Telematik Universität Karlsruhe (TH) www.tm.uka.de

NSLPs QoS NSLP

RSVP-like functionality (but unicast support only) Sender and receiver initiated reservations Independent of specific QoS models such as IntServ or DiffServ Messages

RESERVE: creates modifies or deletes reservation state QUERY: Probing RESPONSE: Reply to RESERVE or QUERY

NAT/FW NSLP

Dynamic configuration of NATs and/or Firewalls along a data path

Establishing bindings Controlled opening of firewall pinholes

SLIDE 5

NSIS - EuroView 2008 Roland Bless

Institut für Telematik Universität Karlsruhe (TH) www.tm.uka.de

WG Status Main specs now “finished”

GIST QoS NSLP NATFW/NSLP QSPEC

Several freely available interoperable implementations, e.g.,

NSIS-ka: https://projekte.tm.uka.de/trac/NSIS Uni Göttingen: FreeNSIS

Must strive for deployment now: assure that protocols get implemented by vendors and used by applications

NSIS - EuroView 2008 Roland Bless

Institut für Telematik Universität Karlsruhe (TH) www.tm.uka.de

Next Steps In Signaling (NSIS) in the IETF Roland Bless - - PDF document

Next Steps In Signaling (NSIS) in the IETF

Roland Bless

What is Signaling? Signaling

exchange of (control) data between nodes to install, manage, or delete states in them happens in the „control plane“

Examples

Classical: SS7 – signaling for circuit switched telephone network Admission control and resource reservation for QoS (Quality-of-Service) support RSVP Dynamic configuration of firewall pinholes or NAT bindings Dynamic activation of measurement points

NSIS Approach Lessons learned from RSVP

used for various unforeseen purposes / signaling applications mobility support required

Assumptions

path-coupled signaling: signaling messages follow data path normal routing (no QoS routing or load balancing etc.) no multicast support considered (at first)

NSIS – Two Layer Split

NTLP: GIST Features

General Internet Signaling Transport (GIST) Protocol Common signaling transport service for different signaling applications Simple message-by-message transport service

conveyed contents are transparent for GIST does not handle signaling application state

Discovery and management of signaling message routes Provides Session-ID – supports mobility Datagram or Connection Mode for message transfer

Establishment of signaling message associations (soft state)

Simple protection against DoS

NTLP/NSLP Scenario

Host GIST NSLP A GIST NSLP A Host GIST NSLP B GIST NSLP A/B GIST NSLP A/B Initiator Forwarder Forwarder Responder Router 1 Router 2 Router 3 Router 4

NSLPs QoS NSLP

RSVP-like functionality (but unicast support only) Sender and receiver initiated reservations Independent of specific QoS models such as IntServ or DiffServ Messages

RESERVE: creates modifies or deletes reservation state QUERY: Probing RESPONSE: Reply to RESERVE or QUERY

NAT/FW NSLP

Dynamic configuration of NATs and/or Firewalls along a data path

Establishing bindings Controlled opening of firewall pinholes

WG Status Main specs now “finished”

GIST QoS NSLP NATFW/NSLP QSPEC

Several freely available interoperable implementations, e.g.,

NSIS-ka: https://projekte.tm.uka.de/trac/NSIS Uni Göttingen: FreeNSIS

Must strive for deployment now: assure that protocols get implemented by vendors and used by applications

Conclusions and Outlook NSIS: New and flexible framework for signaling protocols in the IP layer

General signaling message transport by GIST Different signaling applications: NAT/FW, QoS

Extensible:

Explicit Signaling Target MRM allows path- decoupled signaling

Used in ScaleNet QoS Architecture Probably used in EU project 4WARD: Virtual Network Configuration NSLP