KMSF Strategic Opportunities Symposium Contributions The XMSF Strategic Opportunities Symposium was organized to report back the successful results of the XMSF Technical Challenges Workshop. We asked key program managers and warfighter advocates to present their views on the strategic opportunities provided by Xmsf The Symposium was held 6 September 2002 at George Mason University(GMU) in Fairfax Virginia The following Symposium briefings were presented in response to the XMSF Technical Challenges Workshop report peakers Presentation Contributions Dr.Anita Jones, UVA Keynote: Modeling Simulation Technologies and the Web Co-investigators Don Brutzman, Mark Pullen, KMSF Overview and Technical Workshop Report Katherine L. Morse, Mike Zyda Rob Glidden, Sun Microsystems Web Services Sanjeev Trika, Intel XMSF using Web Technologies: An Authoring Perspective PhilipⅤw.Dods,ADL Advanced Distributed Learning(ADL): SCORM and beyond Imme DTRA DoDs Homeland Defense Role and Web-Based M&S Mike Bailey, TECOM/MCMSMo Trends in Technical Support to Training 2003-2008 Dennis K. McBride, Potomac Institute A"Warfighter"Perspective Dana Paterson, NAVAIR Web-Based Modeling and Simulation: Understanding and Dealing With Complexity in FORCEnet Phil Zimmerman, DMSo XMSF and Enabling DoD M&S Capability MAJ David Laflam USA AMSO Training Exercises and Military Operations (TEMO) Perspective on XMSF Steve Swenson, NUWC/NAVMSMO Navy Modeling and Simulation Alan Murashige, HQ USAF XIW Warfighter Interoperability Additional Contribution David drake. SAIC A Security Approach to XMSF
XMSF Strategic Opportunities Symposium Contributions The XMSF Strategic Opportunities Symposium was organized to report back the successful results of the XMSF Technical Challenges Workshop. We asked key program managers and warfighter advocates to present their views on the strategic opportunities provided by XMSF. The Symposium was held 6 September 2002 at George Mason University (GMU) in Fairfax Virginia. The following Symposium briefings were presented in response to the XMSF Technical Challenges Workshop report. Speakers Presentation Contributions Dr. Anita Jones, UVA Keynote: Modeling & Simulation Technologies and the Web Co-investigators Don Brutzman, Mark Pullen, Katherine L. Morse, Mike Zyda XMSF Overview and Technical Workshop Report Rob Glidden, Sun Microsystems Web Services Sanjeev Trika, Intel XMSF using Web Technologies: An Authoring Perspective Philip V.W. Dodds, ADL Advanced Distributed Learning (ADL): SCORM and beyond Walt Zimmers, DTRA DoD's Homeland Defense Role and Web-Based M&S Mike Bailey, TECOM/MCMSMO Trends in Technical Support to Training 2003-2008 Dennis K. McBride, Potomac Institute A "Warfighter" Perspective Dana Paterson, NAVAIR Web-Based Modeling and Simulation: Understanding and Dealing With Complexity in FORCEnet Phil Zimmerman, DMSO XMSF and Enabling DoD M&S Capability MAJ David Laflam USA, AMSO Training Exercises and Military Operations (TEMO) Perspective on XMSF Steve Swenson, NUWC/NAVMSMO Navy Modeling and Simulation Alan Murashige, HQ USAF XIW Warfighter Interoperability Additional Contribution David Drake, SAIC A Security Approach to XMSF
Today's Prog XMSF Technical Workshop Report Extensible Modeling and Simulation Overview, Web/XML: Dr. Don Brutzman NPS Framework (XMSF lation Dr. Katherine Morse SAIC man and son Universily(GMU) Technologist Perspectives_and Iach SAIC Warfighter Perspectives spectres George Mason SAIC XMSF Session agenda: XMSF Workshop Technical Challenges Workshop Workshop planning, motivations, precepts Monterey Califonia USA, 19-20 August 2002 Workshop structure and participants preceding annual NPS MOVES Open House TEchnical and(some)business considerations ent Workshop conclusions Modeling Simulation Via Web technologies feasible? Overa a Internet/Networking XMSF white paper proin for strategic planning simulation Diverse technical experts invited Impacts and implications Web/XML Point papers luted snapshot of key as MSE motivations P current ap mpatible with effective use of emerging Web te Military modeling simulation has little parent tion support Is rational warfighting impact on warfighters daily tactical operations Diverse simulations do not scalably interoperate with XML-based architecture can provide a bridge nts and open/commercial Web standard Global s a ut connect Web= best tech strategy +best business case physical and logical pes prevent the
1 Strategic Opportunities Symposium, Extensible Modeling and Simulation Framework (XMSF) Don Brutzman and Michael Zyda Naval Postgraduate School Mark Pullen, George Mason University (GMU) Katherine L. Morse, SAIC XMSF Strategic Opportunities Symposium 6 September 2002 2 Today’s Program XMSF Technical Workshop Report nOverview, Web/XML: Dr. Don Brutzman NPS n Internet/networking: Dr. Mark Pullen GMU n Modeling & Simulation: Dr. Katherine Morse SAIC n Defense impact: Dr. Mike Zyda NPS Technologist Perspectives Warfighter Perspectives Programmatic Perspectives Discussion XMSF Strategic Opportunities Symposium 6 September 2002 3 Session agenda: XMSF Workshop Workshop planning, motivations, precepts Workshop structure and participants Technical and (some) business considerations Workshop conclusions nOverall n Internet/Networking n Modeling & Simulation nWeb/XML Impacts and implications XMSF Strategic Opportunities Symposium 6 September 2002 4 XMSF Technical Challenges Workshop Monterey California USA, 19-20 August 2002 n preceding annual NPS MOVES Open House Goal: initial technical survey and assessment n Modeling & Simulation via Web technologies feasible? n XMSF white paper provided basis for discussion n Report back to this group for strategic planning Diverse technical experts invited nWeb/XML, Internet/network, Modeling & Simulation n Point papers for undiluted snapshot of key ideas XMSF Strategic Opportunities Symposium 6 September 2002 5 XMSF motivations Web-based technologies can provide an extensible modeling and simulation architecture, to support a new generation of interoperable applications Simulation support is needed for operational warfighting capabilities XML-based architecture can provide a bridge between emerging rehearsal/reality/replay requirements and open/commercial Web standards Web = best tech strategy + best business case XMSF Strategic Opportunities Symposium 6 September 2002 6 Problems Current approaches are not compatible with effective use of emerging Web technologies Military modeling & simulation has little or no apparent impact on warfighters’ daily tactical operations Diverse simulations do not scalably interoperate with warfighting systems Global systems are not yet possible without connection to common interoperable framework ß physical and logical “stovepipes” prevent this
Motivation XMSF project bootstrap strateg defense modeling neet real-world needs Enumerate tech Workshop of key reper us,focus.pr business model Demonstrate how new capabilities might help Easy use and open extensibility for developers and users Government, science, com-iionsm, homeland defers Multi-year simulation initiative via Web approach? nceptual applications demos at WITSE NPS, GMU, SAIC have started, shared strat Related work: workshop on software componentization Planning for change,quick start July 2002, DMSO, DC Technical Challenges Worksh two dozen attendees, poc phil Zin NPS,August 1920, focused expert efforts .slidesets and con strategic Opportunities Symposium George Mason Consensus seemed to be Broader feed nght track? what else is needed? interacting simulat Exemplar Demonstrations V/ITSEC demos, Orlando Florida December 2-5 and well Next steps for XMSF this fall? what else is needed Workshop strategy How to solve big problems? Divide&conquer Technical Challenges Workshop Three perspe Structure, approach, detail Web techno Internet and Networking Modeling and simulation(M&s White paper lays out initial basic framework
2 XMSF Strategic Opportunities Symposium 6 September 2002 7 Motivation Transformational technologies are needed to scale up defense modeling/simulation to meet real-world needs Can we use Web technologies as common framework? n Dynamic capabilities, open standards, Web business model provide lift to support government and commercial success n Easy use and open extensibility for developers and users, fueling rapid growth of interoperable simulations n Bring defense modeling/simulation/tactical support into mainstream of enterprise-wide best-business practices XMSF Strategic Opportunities Symposium 6 September 2002 8 XMSF project bootstrap strategy Outline large-scale next-generation framework n Simulation interoperability via Web technologies Enumerate technology, languages, specifications n Workshop of key researchers to refine requirements n Seek broad feedback for consensus, focus, progress Demonstrate how new capabilities might help n Current war effort against terrorism, homeland defense n Government, science, commerce, education, commerce, etc. Multi-year simulation initiative via Web approach? n Workshop & symposium produce strategy, white paper n Conceptual applications demos at I/ITSEC in December n NPS, GMU, SAIC have started, shared strategies welcome XMSF Strategic Opportunities Symposium 6 September 2002 9 Related work: workshop on software componentization July 2002, DMSO, DC n two dozen attendees, POC Phil Zimmerman n slidesets and conclusions available soon Consensus seemed to be: n components are a worthwhile approach to consider for improving composability and interoperability of diverse interacting simulations n component technology is sufficiently mature and well defined for building exemplars XMSF Strategic Opportunities Symposium 6 September 2002 10 Planning for change, quick start Technical Challenges Workshop n NPS, August 19-20, focused expert efforts Strategic Opportunities Symposium nGeorge Mason University, September 6 – welcome! n Immediately precedes SIW for good participation n Broader feedback: right track? what else is needed? Exemplar Demonstrations n I/ITSEC demos, Orlando Florida December 2-5 Next steps for XMSF … n another workshop this fall? what else is needed? Technical Challenges Workshop Structure, approach, details XMSF Strategic Opportunities Symposium 6 September 2002 12 Workshop strategy 1 How to solve big problems? Divide & conquer. Three perspectives nWeb technologies, XML n Internet and Networking n Modeling and simulation (M&S) White paper lays out initial basic framework n please use, extend, correct, disagree
Workshop strategy 2 Web/XML group How to solve big problems? Divide ch for all three tech What do we agree on: determine coh a Erik Chaum NUWC hat Dr Edward Sims, Vcom3D Dr. Chenghu tio, Fraunhofer What are most importan TRAC Monterey Dr David Kwak. MITRE man. DMsO Document workshop and symposium results Most important outcomes may be education, direction tenet/networking group Modeling simulation group Dr Mark Puen. GM Dr. Katherine Morse, SAIC on, GSC Assoc. Dr Make Bailey C TECOM Dr Suleyman Guleyupoglu,. Dr. Norbert Schiffer, CRCG Dr. Marcelo Zuffo, University Dr. Dick Puk, Intelligraphi Dr Andreas tok o XMSF website, report Position paper revision Position papers and slides ble at Feel free to r and modify points ttp/hwww.mbvesimstituf but little need for duplication clarity is key Participants can improve/amend contributions and URLs, please Report revision dates: September 1 and 8 Will provide position papers with final report 3
3 XMSF Strategic Opportunities Symposium 6 September 2002 13 Workshop strategy 2 How to solve big problems? Divide & conquer. Triage approach for all three technical areas: nWhat do we agree on: determine consensus nWhat do we disagree on: more work needed nWhat are most important directions for further work Document workshop and symposium results n Most important outcomes may be education, direction XMSF Strategic Opportunities Symposium 6 September 2002 14 Web/XML group n Moderator: Dr. Don Brutzman, NPS n Erik Chaum NUWC n Rob Glidden Sun n Jack Jackson, TRAC Monterey n Dr. David Kwak, MITRE n Recorders: Steve Fouskarinis SAIC, Curt Blais NPS n Dr. Francisco Loaiza, IDA n Dr. Edward Sims, Vcom3D n Dr. Chenghui Luo, Fraunhofer CRCG n Phil Zimmerman, DMSO XMSF Strategic Opportunities Symposium 6 September 2002 15 Internet/networking group Moderator: n Dr. Mark Pullen, GMU n Dr. Rusty Baldwin, AFIT n Scott Bradner, IESG, Harvard n Dr. Suleyman Guleyupoglu, NRL n Dr. Sue Numrich, DMSO Recorders: n Don McGregor, NPS n Dave Laflam, AMSO n Denny Moen GMU n Dr. Steve Carson, GSC Assoc. n Dr. Norbert Schiffner, CRCG n Dr. Marcelo Zuffo, University Sao Paolo n two last-minute drops wDr. Sandeep Singhal Reefedge wDr. Mikel Petty ODU XMSF Strategic Opportunities Symposium 6 September 2002 16 Modeling & simulation group Moderator: n Dr. Katherine Morse, SAIC n Dr. Mike Bailey USMC TECOM n Dr. Paul Diefenbach, OpenWorlds n Dr. Niki Deliman Goerger, USA ERDC n Alan Hudson, Yumetech Recorders: n Joerg Wellbrink, NPS n Simon Goerger, NPS n Dr. Kalyan S. Perumalla, Georgia Inst. of Technology n Dr. Dick Puk, Intelligraphics n Dr. Cristina Russo dos Santos, Eurecom, University Toulon n Dr. Andreas Tolk, ODU n Dr. Sanjeev Trika, Intel XMSF Strategic Opportunities Symposium 6 September 2002 17 XMSF website, report Position papers and slides available at http://www.movesInstitute.org/xmsf Participants can improve/amend contributions Report revision dates: September 1 and 8 XMSF Strategic Opportunities Symposium 6 September 2002 18 Position paper revisions Feel free to reconsider and modify points n but little need for duplication n clarity is key n lots of references and URLs, please Will provide position papers with final report
Initial technical positions Virtual worlds a nuous simulations Multi-agent Interactive, man-n-the-log nop equip quipment-in-oop systems Audio and video( both ne mple leaming curve and repeatable examples Compatible with Web architecture and technologies Support users and Highly distributed Modular structure Not necessanly Use by humans and software agents equally important Plug-ins co plug-ins at ru Standards-based Support for pdel components IsO. Root data-structure citieD using XML schema egrate with tactical system picture of operations Connection point System life-cycle patterns Top-Level Requirements 3 Top-Level Requirements 4 I Support for XML( Expected computer performance smal fas software redundancy Security levels consistent with current Web technology Modems through ADSL(.05-1.5 Mbps) for limited pa s10-1Gbps for partcipation Public library of useful reusable compd oc3 up through gigabit wide-area networking oss-platform capab Backward compatibili Rendering support rchitectural hooks for visual simulations protocols,where if make th existing architectures and e.g. DIS. HLARTI, ALSP. probably many oth
4 Initial technical positions XMSF Strategic Opportunities Symposium 6 September 2002 20 Application Domains Discrete-event and constructive simulations Virtual worlds and continuous simulations Multi-agent systems Interactive, man-in-the-loop, equipment-in-loop systems Live and virtual entities, mixed seamlessly Distance learning for interaction among participants n Audio and video (both needed for WAN testing anyway) n Multiformat whiteboard; recording and playback n Teaching and training compatibility via ADL SCORM n Simulations usable for training, also training for simulation use XMSF Strategic Opportunities Symposium 6 September 2002 21 Top-Level Requirements 1 Ability to interact directly and scalably over the network Compatible with Web architecture and technologies n Highly distributed n Not necessarily connected to Web, but using Web technologies Use by humans and software agents equally important Support for composable, reusable model components n Root data-structure representations specified using XML schema n Representations in other languages autogenerated directly n Connection point between syntax and RDF Schema, semantics XMSF Strategic Opportunities Symposium 6 September 2002 22 Top-Level Requirements 2 Simple learning curve and repeatable examples n Support users and developers Modular structure n Ability to directly interact with network layer n Plug-ins connecting into kernel plug-ins at run time Standards-based n IEEE, ISO, W3C, IETF, Web3D Integrate with tactical systems n Augment group shared picture of operations n Producers and consumers n System life-cycle patterns, repeatability XMSF Strategic Opportunities Symposium 6 September 2002 23 Top-Level Requirements 3 Support for XML and multiple programming languages Dynamically extensible at run time: “always on” n software + hardware, diversity includes backwards compatibility n loose coupling, verification/validation, repair, graceful degradation, redundancy, etc. Security levels consistent with current Web technology Public library of useful reusable components Cross-platform capabilities Rendering support and architectural hooks for visual simulations XMSF Strategic Opportunities Symposium 6 September 2002 24 Top-Level Requirements 4 Expected computer performance: n Small, fast, inexpensive computers n Reconnect via GRID computing (distributed operating systems) Expected network performance: n Modems through ADSL (0.05-1.5 Mbps) for limited participation n 10 - 1Gbps for local participation n OC3 up through gigabit wide-area networking Backward compatibility with existing architectures and protocols, where it makes sense n e.g. DIS, HLA/RTI, ALSP, probably many others
M&S Functional Requirements ackward compatibility Business model considerations Composability Multi-resolution modeling nitial discussions Simulation support services Business Model 1 Business Model 2 Minimal architecture in Commercial models in partnership with open-source Royalty-free enabler nning ski for a fee and give up ngt a Proprietary softwar hey like on this and sell i - Someone needs to put together the simulations Even t al the parts despite intermittent Success of the overall endeavor is key to business success DoD Business Model I Commercial technology is crucial We can,'t do it alone Workshop Conclusions ed technology requirements harmful outdated technolo sper Slipstreaming standards and industry "best practices
5 XMSF Strategic Opportunities Symposium 6 September 2002 25 M&S Functional Requirements Backward compatibility Authoritative representations Composability Multi-resolution modeling Tactical system integration Simulation support services n Time management n Logging and playback Business model considerations Initial discussions XMSF Strategic Opportunities Symposium 6 September 2002 27 Business Model 1 Minimal architecture includes open-source implementation n Royalty-free enabler, usable without any fee restrictions whatsoever Important to have two or more interoperable implementations n Commercial implementations profitably augment open source Long-term stable infrastructure enables sustainable business models n Flexible architecture broadens market: not “just” military simulation, also full World Wide Web via open/secure Internets n Web-enabled architecture allows more sponsors to participate, which allows simulations, models, and applications to survive despite intermittent funding profiles n Transferable career-building skills and reusable experience for programmers and managers XMSF Strategic Opportunities Symposium 6 September 2002 28 Business Model 2 Commercial models in partnership with open-source n Support w Offer programming skill for a fee and give up rights to the source if it is infrastructure related. n Proprietary software w A vendor may write a simulator that runs on top of the free infrastructure. They can use any license they like on this and sell it as they see fit. n Consulting w Someone needs to put together the simulations. Even if all the parts are free, this is a salable service. n Maintenance w Numerous success stories exist. Success of the overall endeavor is key to business success. XMSF Strategic Opportunities Symposium 6 September 2002 29 DoD Business Model Commercial technology is crucial nWe can’t do it alone Specialized technology requirements harmful n Translate into always spending too much for unique, outdated technology Nothing succeeds like success n Slipstreaming standards and industry “best practices” makes best sense for industry partners too Workshop Conclusions
Observations Conclusions,2 i signet hip acros ent areas will Web technologies for networked modeling .Web Technologies /XML Ne simulation appears to be feasible Benefit from b ical insights Interrelated goals and concems Lots of different ideas about how to execute XMSF concept must continue to be refined from a recommendations, practices, and applications Conclusions.4 Conclusions Need exemplar applications identified, initiated Security concems are cross-cutting for all area or unforeseen vutherabiroughout design process must be addressed thro ately equal number of Web-related technical challenges solutions presented Likely feasible but recuring thro.t ifedycle cusing future wa/m /are promising area for Web Services app Additional group-specific topics follow Web Group summary Many issues to consider, listed in/worksho Web/XML group report,group notes and individual point papers Don Brutzman moderator wa3c has done the heavy liting already, there are many languages and specifications which work well together today Web e all pability in an
6 XMSF Strategic Opportunities Symposium 6 September 2002 31 Observations Significant agreement, consensus on principles Web technologies for networked modeling & simulation appears to be feasible Lots of different ideas about how to execute n few (if any) contradictions XMSF Strategic Opportunities Symposium 6 September 2002 32 Conclusions 1, 2 Close working relationship across all three component areas will continue to be needed nWeb Technologies / XML, Networking, and M&S n Benefit from broad technical insights n Interrelated goals and concerns XMSF concept must continue to be refined from a high-level concept to definitive technical recommendations, practices, and applications XMSF Strategic Opportunities Symposium 6 September 2002 33 Conclusions 3, 4 Need exemplar applications identified, initiated n Collectively and clearly demonstrate the application potential of XMSF concepts n A number of existing and emerging programs were discussed as possible contexts for the exemplars Web Services appear are promising area for focusing future work n synopsis to follow XMSF Strategic Opportunities Symposium 6 September 2002 34 Conclusions 5 Security concerns are cross-cutting for all areas, must be addressed throughout design process n or unforeseen vulnerabilities occur n Approximately equal number of Web-related technical challenges & solutions presented n Likely feasible but recurring throughout lifecycle n Independent of classical physical/military security Additional group-specific topics follow. Web/XML group Don Brutzman moderator XMSF Strategic Opportunities Symposium 6 September 2002 36 Web Group summary Many issues to consider, listed in workshop report, group notes and individual point papers W3C has done the heavy lifting already, there are many languages and specifications which work well together today Web Services architectures: promising approach to organize all this capability in an actionable way
Web Services Internet/networking group Mark Pullen moder tailed methods,parameters Web Services Description Language ML Messaging imple XML encoding/decoding Remote Procedure Calis, XML Proloc Service Transport Http. smTp. Ftp. Bee ansfer is independent af me EXtensible model and Simulation Fram XMSF Position XMSF Symposium spectrum of DoD meroperability of the support scalable eorge Mason tructive, virtual, and ork are as integrating legacy simulation frameworks Mark Pullen Precondition for Success Working Group Focus Leaders and workers from the three technical areas(Web, Internet, M&S)must work as a ated tea NETWORKING with effective(human) interfaces among all elements a we have that it does not work to"throw it over the wa solutions need to work 7
7 XMSF Strategic Opportunities Symposium 6 September 2002 37 Web Services HTTP, SMTP, FTP, BEEP Transfer is independent of messages Service Transport Move messages between apps XML-RPC, SOAP, XMLP Remote Procedure Calls, XML Protocol XML Messaging Simple XML encoding/decoding WSDL Web Services Description Language Services Description Detailed methods, parameters UDDI, LDAP Universal Description, Discovery Integration, Lightweight Directory Access Protocol Services Discovery Publish, search capabilities Administrative Exemplar: DoD XML Registry Repositories Where approved services reside Internet/networking group Mark Pullen moderator XMSF Symposium 9/6/2002 George Mason University, Fairfax Virginia Network Area Mark Pullen EXtensible Modeling and Simulation Framework XMSF Strategic Opportunities Symposium 6 September 2002 40 XMSF Position Web-based technologies have the capability to support scalable interoperability of the spectrum of DoD models and simulations including constructive, virtual, and live as well as integrating legacy simulation frameworks and the increasingly important distancelearning technologies. XMSF Strategic Opportunities Symposium 6 September 2002 41 Precondition for Success Leaders and workers from the three major technical areas (Web, Internet, M&S) must work as a coordinated team n with effective (human) interfaces among all elements n we have learned that it does not work to “throw it over the wall” ! n solutions need to work end-to-end XMSF Strategic Opportunities Symposium 6 September 2002 42 Working Group Focus WEB/XML Data Representation Service Description Graphical User Interface Description State Transition Description Security Paradigm Transactions Ontologies Repositories Search Engines NETWORKING End-to-end QoS Many-to-many Multicast Streaming Multimedia Network Monitoring Negotiation of QoS Object Request Broker Group Coordination Middleware Session Coordination Middleware MODELING & SIMULATION Backward Compatibility Authoritative Representations Composability Multi-resolution modeling Tactical System Integration Simulation Support Services
Web Techi Networking WG I Requires aggressive reliance on gor Scott Bradner, Harvard&IESG technologies and actiye engagem Dr Suleyman Guleyupoglu, NRL I so.Wac正 EE Jand Web3 Dr. Sue Numrich, DMSO Adaptive,cross-platform capabilities will be a Dr. Marcelo Zuffo, U. of Sao Paulo, Brazi Dr Steve Carson, GSC Associates NOTE: We had good agreemet on al ises, possibly Network Qos ts a s ed or neg Networking WG standard for. Working assumptions The simulation will hot be confined to individual capacity, latency, jitter, loss in.- vidual ISE a also in actve path se to defini Must be able to un over the public intemet needs of a we the benefits of XMSF to e.g. does the application need to enjoy the Scalability and resilience are es arly work project Network QoS continued M&s must characterize network requirement must define @cceptable terized fotm.en reliability nts are not met and latency in a param this implies they must be measured and global do Intermet-wide Qos negotiation take advantage lf changing network capacity ot to authentcation, d f service protec
8 XMSF Strategic Opportunities Symposium 6 September 2002 43 Web Technologies / XML Requires aggressive reliance on commercial technologies and active engagement with their standards development groups such as IETF, ISO, W3C, IEEE, and Web3D. Adaptive, cross-platform capabilities will be a given XMSF Strategic Opportunities Symposium 6 September 2002 44 Networking WG Scott Bradner, Harvard & IESG Dr. Suleyman Guleyupoglu, NRL Dr. Sue Numrich, DMSO Dr. Norbert Schiffner, Fraunhofer CFCG Dr. Marcelo Zuffo, U. of Sao Paulo, Brazil Dr. Steve Carson, GSC Associates NOTE: We had good agreement on all issues, possibly because the technologies we considered are more mature. XMSF Strategic Opportunities Symposium 6 September 2002 45 Networking WG Working assumptions: n The simulation will not be confined to individual networks w either private networks individual ISPs n Application should not be media-aware n Must be able to run over the public Internet w without this, can’t achieve the benefits of XMSF to commercial industry n then defense can’t enjoy them either! n Scalability and resilience are essential in XMSF XMSF Strategic Opportunities Symposium 6 September 2002 46 Network QoS: meets a specified or negotiated standard for: n capacity, latency, jitter, loss in a statistical sense w can be done today in general terms within individual ISP networks w also Internet-wide by proactive path selection n a workable approach to defining consistency needs of applications * w e.g. does the application need to know order of sending w this requires translation from application requirements to network capabilities * early work project XMSF Strategic Opportunities Symposium 6 September 2002 47 Network QoS continued n must define acceptable tradeoff between reliability and latency in a parameterized form * n if a negotiated solution, mechanism(s) for negotiation needed w could be different for global and local negotiation w we don’t know how to do Internet-wide QoS negotiation XMSF Strategic Opportunities Symposium 6 September 2002 48 M&S must characterize network requirements n and the impact if the requirements are not met n this implies they must be measured and understood * n cannot assume any-to-any communication w firewalls and network address translation (NAT) get in the way n application or middleware should be able to adapt to take advantage of changing network capacity * w implies higher layer must be aware of available capacity n must define security requirements: w authentication, denial of service protection, confidentiality, auditing, integrity
Thoughts from networking Many-to-many multicast In general the simulation network could be capability-no overlay network requirements of M&S ly reliable/real-fifme multicas Need a capability for end-to-end network status s it will be support M&S this also can be pone in an overlay network networked group communicatio non-multicast andardize on over network layer Missing/problematic critical middleware Implementation Questions NTP and/or GPs will real-tim ed to network time for XMSF s authentication/a and can be used to weateieve that Grid and Cluster style network computing will accommodate XMSF without modifications A ry ust be adequately funded for operation What We Believe is Available What We Believe is(Achievable s and multicast provided on P private-network Dos on a multi-network basis (not Internet W the problem is the business case, not the technology Multicast through overlay networks latency under 100 ms one-way in North amenica . VPN ing application-tra nt multicast Enhanced perfo for digital ibi through caching by Good global synchronization via NTP/GPS apply to dynamic d changed by simulations Reliable multicast for bulk data transfer
9 XMSF Strategic Opportunities Symposium 6 September 2002 49 Many-to-many multicast n trend is away from providing this as a network layer capability - no good business model w one-to-many may become available n must define requirements for reliability * w e.g. selectively reliable/real-time, fully reliable/non-real-time w it is impossible to have fully reliable/real-time multicast n identifying and responding to congestion is a requirement n it will be necessary to support M&S needs for networked group communication over non-multicast network layer * XMSF Strategic Opportunities Symposium 6 September 2002 50 Thoughts from networking community In general the simulation network could be an overlay network * n for example, virtual private network (VPN) n allows an ISP or the Internet to meet specialized requirements of M&S Need a capability for end-to-end network status & performance monitoring * n this also can be done in an overlay network Standardize on over-the-net protocols n riding over standard Internet protocols n proven basis for enabling interoperability XMSF Strategic Opportunities Symposium 6 September 2002 51 Missing/problematic critical middleware n real-time object request broker n authentication/authorization services n real-time directory services n group coordination/synchronization n session coordination likely is not a problem w Session Initiation Protocol does signaling w automated setup/teardown still needs attention XMSF Strategic Opportunities Symposium 6 September 2002 52 Implementation Questions NTP and/or GPS will be needed to provide synchronized network time for XMSF n GPS is more accurate and can be used to synchronize a local NTP master We believe that Grid and Cluster style network computing will accommodate XMSF without modifications n as long as network capacity is sufficient A dedicated and monitorable test environment would accelerate development of an XMSF community n use Next Generation Internet networks (Abilene, DREN, etc.) n must be adequately funded for operation XMSF Strategic Opportunities Symposium 6 September 2002 53 What We Believe is Available QoS and multicast can be provided on a private-network basis (probably in NGI) Performance available off-the-shelf: n individual flows to ~100 Mbps n latency under 100 ms one-way in North America n jitter manageable by buffering, increases latency ~10% n packet loss <1% High performance end-to-end with instant startup is practical as long as reliable delivery is not needed n TCP does not scale well to wide-area flows above 100 Mbps Good global synchronization via NTP/GPS n secure NTP may be required in some cases XMSF Strategic Opportunities Symposium 6 September 2002 54 What We Believe is Achievable QoS on a multi-network basis (not Internet wide) n the problem is the business case, not the technology Multicast through overlay networks n VPN n middleware providing application-transparent multicast Enhanced performance for digital libraries through caching n individual flows ~1 Gbps by localizing access n does not apply to dynamic data exchanged by simulations Reliable multicast for bulk data transfer