| < draft-dreibholz-tsvwg-sctpsocket-sqinfo-23.txt | draft-dreibholz-tsvwg-sctpsocket-sqinfo-24.txt > | |||
|---|---|---|---|---|
| Network Working Group T. Dreibholz | Network Working Group T. Dreibholz | |||
| Internet-Draft SimulaMet | Internet-Draft SimulaMet | |||
| Intended status: Experimental R. Seggelmann | Intended status: Experimental R. Seggelmann | |||
| Expires: March 10, 2022 Muenster Univ. of App. Sciences | Expires: 22 September 2022 Münster Univ. of App. Sciences | |||
| M. Becke | M. Becke | |||
| HAW Hamburg | HAW Hamburg | |||
| September 06, 2021 | 21 March 2022 | |||
| Sender Queue Info Option for the SCTP Socket API | Sender Queue Info Option for the SCTP Socket API | |||
| draft-dreibholz-tsvwg-sctpsocket-sqinfo-23 | draft-dreibholz-tsvwg-sctpsocket-sqinfo-24 | |||
| Abstract | Abstract | |||
| This document describes an extension to the SCTP sockets API for | This document describes an extension to the SCTP sockets API for | |||
| querying information about the sender queue. | querying information about the sender queue. | |||
| Status of This Memo | Status of This Memo | |||
| This Internet-Draft is submitted in full conformance with the | This Internet-Draft is submitted in full conformance with the | |||
| provisions of BCP 78 and BCP 79. | provisions of BCP 78 and BCP 79. | |||
| skipping to change at page 1, line 34 ¶ | skipping to change at page 1, line 34 ¶ | |||
| Internet-Drafts are working documents of the Internet Engineering | Internet-Drafts are working documents of the Internet Engineering | |||
| Task Force (IETF). Note that other groups may also distribute | Task Force (IETF). Note that other groups may also distribute | |||
| working documents as Internet-Drafts. The list of current Internet- | working documents as Internet-Drafts. The list of current Internet- | |||
| Drafts is at https://datatracker.ietf.org/drafts/current/. | Drafts is at https://datatracker.ietf.org/drafts/current/. | |||
| Internet-Drafts are draft documents valid for a maximum of six months | Internet-Drafts are draft documents valid for a maximum of six months | |||
| and may be updated, replaced, or obsoleted by other documents at any | and may be updated, replaced, or obsoleted by other documents at any | |||
| time. It is inappropriate to use Internet-Drafts as reference | time. It is inappropriate to use Internet-Drafts as reference | |||
| material or to cite them other than as "work in progress." | material or to cite them other than as "work in progress." | |||
| This Internet-Draft will expire on March 10, 2022. | This Internet-Draft will expire on 22 September 2022. | |||
| Copyright Notice | Copyright Notice | |||
| Copyright (c) 2021 IETF Trust and the persons identified as the | Copyright (c) 2022 IETF Trust and the persons identified as the | |||
| document authors. All rights reserved. | document authors. All rights reserved. | |||
| This document is subject to BCP 78 and the IETF Trust's Legal | This document is subject to BCP 78 and the IETF Trust's Legal | |||
| Provisions Relating to IETF Documents | Provisions Relating to IETF Documents (https://trustee.ietf.org/ | |||
| (https://trustee.ietf.org/license-info) in effect on the date of | license-info) in effect on the date of publication of this document. | |||
| publication of this document. Please review these documents | Please review these documents carefully, as they describe your rights | |||
| carefully, as they describe your rights and restrictions with respect | and restrictions with respect to this document. Code Components | |||
| to this document. Code Components extracted from this document must | extracted from this document must include Revised BSD License text as | |||
| include Simplified BSD License text as described in Section 4.e of | described in Section 4.e of the Trust Legal Provisions and are | |||
| the Trust Legal Provisions and are provided without warranty as | provided without warranty as described in the Revised BSD License. | |||
| described in the Simplified BSD License. | ||||
| Table of Contents | Table of Contents | |||
| 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 | 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 | |||
| 2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 2 | 2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 2 | |||
| 3. Sender Queue Info (SCTP_SQINFO) . . . . . . . . . . . . . . . 2 | 3. Sender Queue Info (SCTP_SQINFO) . . . . . . . . . . . . . . . 2 | |||
| 4. Testbed Platform . . . . . . . . . . . . . . . . . . . . . . 3 | 4. Testbed Platform . . . . . . . . . . . . . . . . . . . . . . 3 | |||
| 5. Security Considerations . . . . . . . . . . . . . . . . . . . 3 | 5. Security Considerations . . . . . . . . . . . . . . . . . . . 3 | |||
| 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 | 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 | |||
| 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 4 | 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 4 | |||
| 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 | 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 | |||
| 8.1. Normative References . . . . . . . . . . . . . . . . . . 4 | 8.1. Normative References . . . . . . . . . . . . . . . . . . 4 | |||
| 8.2. Informative References . . . . . . . . . . . . . . . . . 5 | 8.2. Informative References . . . . . . . . . . . . . . . . . 4 | |||
| Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7 | Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6 | |||
| 1. Introduction | 1. Introduction | |||
| This draft describes an extension to the SCTP sockets API (see | This draft describes an extension to the SCTP sockets API (see [4], | |||
| [RFC6458], [I-D.dreibholz-tsvwg-sctpsocket-multipath] [RFC4960]) | [6] [3]) which allows an application to query the sender queue | |||
| which allows an application to query the sender queue utilization per | utilization per stream. This information is necessary for | |||
| stream. This information is necessary for applications to make | applications to make efficient use of a mapping of streams to | |||
| efficient use of a mapping of streams to dissimilar paths. A | dissimilar paths. A detailed description including simulation | |||
| detailed description including simulation results can be found in | results can be found in [7]. | |||
| [PFLDNeT2010]. | ||||
| In particular, this API extension is useful when using the CMT-SCTP, | In particular, this API extension is useful when using the CMT-SCTP, | |||
| CMT/RPv1-SCTP, CMT/RPv2-SCTP and MPTCP-like extensions (see | CMT/RPv1-SCTP, CMT/RPv2-SCTP and MPTCP-like extensions (see [5], | |||
| [I-D.tuexen-tsvwg-sctp-multipath], [Dre2012], [PAMS2012], [PAMS2011], | [13], [12], [9], [10], [11], [8]) for Concurrent Multipath Transfer | |||
| [ConTEL2011], [SoftCOM2011], [Globecom2010]) for Concurrent Multipath | (CMT) with SCTP. | |||
| Transfer (CMT) with SCTP. | ||||
| 2. Conventions | 2. Conventions | |||
| The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", | The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", | |||
| "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and | "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and | |||
| "OPTIONAL" in this document are to be interpreted as described in BCP | "OPTIONAL" in this document are to be interpreted as described in BCP | |||
| 14 [RFC2119] [RFC8174] when, and only when, they appear in all | 14 [1] [2] when, and only when, they appear in all capitals, as shown | |||
| capitals, as shown here. | here. | |||
| 3. Sender Queue Info (SCTP_SQINFO) | 3. Sender Queue Info (SCTP_SQINFO) | |||
| This socket option obtains the maximum sender queue size (in bytes), | This socket option obtains the maximum sender queue size (in bytes), | |||
| the current total sender queue utilization (in bytes) as well as the | the current total sender queue utilization (in bytes) as well as the | |||
| current utilization per stream (in bytes). | current utilization per stream (in bytes). | |||
| The following structure is used to obtain the sender queue | The following structure is used to obtain the sender queue | |||
| information: | information: | |||
| skipping to change at page 3, line 41 ¶ | skipping to change at page 3, line 41 ¶ | |||
| Note, that the caller of getsockopt() MUST provide a | Note, that the caller of getsockopt() MUST provide a | |||
| sctp_sndqueueinfo structure which can hold at least as many | sctp_sndqueueinfo structure which can hold at least as many | |||
| sq_queued_on_stream entries as the association's number of outgoing | sq_queued_on_stream entries as the association's number of outgoing | |||
| streams. Otherwise, the getsockopt() call will fail and return an | streams. Otherwise, the getsockopt() call will fail and return an | |||
| error. | error. | |||
| 4. Testbed Platform | 4. Testbed Platform | |||
| A large-scale and realistic Internet testbed platform with support | A large-scale and realistic Internet testbed platform with support | |||
| for the multi-homing feature of the underlying SCTP protocol is | for the multi-homing feature of the underlying SCTP protocol is | |||
| NorNet. A description of NorNet is provided in [PAMS2013-NorNet], | NorNet. A description of NorNet is provided in [14], [15], some | |||
| [ComNets2013-Core], some further information can be found on the | further information can be found on the project website [16]. | |||
| project website [NorNet-Website]. | ||||
| 5. Security Considerations | 5. Security Considerations | |||
| Security considerations for the SCTP sockets API are described by | Security considerations for the SCTP sockets API are described by | |||
| [RFC6458]. | [4]. | |||
| 6. IANA Considerations | 6. IANA Considerations | |||
| This document does not require IANA actions. | This document does not require IANA actions. | |||
| 7. Acknowledgments | 7. Acknowledgments | |||
| The authors would like to thank Michael Tuexen and Irene Ruengeler | The authors would like to thank Michael Tuexen and Irene Ruengeler | |||
| for their support. | for their support. | |||
| 8. References | 8. References | |||
| 8.1. Normative References | 8.1. Normative References | |||
| [I-D.dreibholz-tsvwg-sctpsocket-multipath] | [1] Bradner, S., "Key words for use in RFCs to Indicate | |||
| Dreibholz, T., Becke, M., and H. Adhari, "SCTP Socket API | ||||
| Extensions for Concurrent Multipath Transfer", draft- | ||||
| dreibholz-tsvwg-sctpsocket-multipath-22 (work in | ||||
| progress), March 2021. | ||||
| [I-D.tuexen-tsvwg-sctp-multipath] | ||||
| Amer, P. D., Becke, M., Dreibholz, T., Ekiz, N., Iyengar, | ||||
| J., Natarajan, P., Stewart, R. R., and M. Tuexen, "Load | ||||
| Sharing for the Stream Control Transmission Protocol | ||||
| (SCTP)", draft-tuexen-tsvwg-sctp-multipath-22 (work in | ||||
| progress), August 2021. | ||||
| [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate | ||||
| Requirement Levels", BCP 14, RFC 2119, | Requirement Levels", BCP 14, RFC 2119, | |||
| DOI 10.17487/RFC2119, March 1997, | DOI 10.17487/RFC2119, March 1997, | |||
| <https://www.rfc-editor.org/info/rfc2119>. | <https://www.rfc-editor.org/info/rfc2119>. | |||
| [RFC4960] Stewart, R., Ed., "Stream Control Transmission Protocol", | [2] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC | |||
| 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, | ||||
| May 2017, <https://www.rfc-editor.org/info/rfc8174>. | ||||
| [3] Stewart, R., Ed., "Stream Control Transmission Protocol", | ||||
| RFC 4960, DOI 10.17487/RFC4960, September 2007, | RFC 4960, DOI 10.17487/RFC4960, September 2007, | |||
| <https://www.rfc-editor.org/info/rfc4960>. | <https://www.rfc-editor.org/info/rfc4960>. | |||
| [RFC6458] Stewart, R., Tuexen, M., Poon, K., Lei, P., and V. | [4] Stewart, R., Tuexen, M., Poon, K., Lei, P., and V. | |||
| Yasevich, "Sockets API Extensions for the Stream Control | Yasevich, "Sockets API Extensions for the Stream Control | |||
| Transmission Protocol (SCTP)", RFC 6458, | Transmission Protocol (SCTP)", RFC 6458, | |||
| DOI 10.17487/RFC6458, December 2011, | DOI 10.17487/RFC6458, December 2011, | |||
| <https://www.rfc-editor.org/info/rfc6458>. | <https://www.rfc-editor.org/info/rfc6458>. | |||
| [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC | [5] Amer, P. D., Becke, M., Dreibholz, T., Ekiz, N., Iyengar, | |||
| 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, | J., Natarajan, P., Stewart, R. R., and M. Tuexen, "Load | |||
| May 2017, <https://www.rfc-editor.org/info/rfc8174>. | Sharing for the Stream Control Transmission Protocol | |||
| (SCTP)", Work in Progress, Internet-Draft, draft-tuexen- | ||||
| tsvwg-sctp-multipath-23, 9 February 2022, | ||||
| <https://www.ietf.org/archive/id/draft-tuexen-tsvwg-sctp- | ||||
| multipath-23.txt>. | ||||
| 8.2. Informative References | [6] Dreibholz, T., Becke, M., and H. Adhari, "SCTP Socket API | |||
| Extensions for Concurrent Multipath Transfer", Work in | ||||
| Progress, Internet-Draft, draft-dreibholz-tsvwg- | ||||
| sctpsocket-multipath-23, 6 September 2021, | ||||
| <https://www.ietf.org/archive/id/draft-dreibholz-tsvwg- | ||||
| sctpsocket-multipath-23.txt>. | ||||
| [ComNets2013-Core] | 8.2. Informative References | |||
| Gran, E., Dreibholz, T., and A. Kvalbein, "NorNet Core - A | ||||
| Multi-Homed Research Testbed", Computer Networks, Special | ||||
| Issue on Future Internet Testbeds Volume 61, Pages 75-87, | ||||
| ISSN 1389-1286, DOI 10.1016/j.bjp.2013.12.035, March 2014, | ||||
| <https://www.simula.no/file/simulasimula2236pdf/download>. | ||||
| [ConTEL2011] | [7] Dreibholz, T., Seggelmann, R., Tüxen, M., and E. P. | |||
| Dreibholz, T., Becke, M., Adhari, H., and E. Rathgeb, "On | Rathgeb, "Transmission Scheduling Optimizations for | |||
| the Impact of Congestion Control for Concurrent Multipath | Concurrent Multipath Transfer", Proceedings of the 8th | |||
| Transfer on the Transport Layer", Proceedings of the 11th | International Workshop on Protocols for Future, Large- | |||
| IEEE International Conference on | Scale and Diverse Network Transports (PFLDNeT) Volume 8, | |||
| Telecommunications (ConTEL) Pages 397-404, | ISSN 2074-5168, 29 November 2010, <https://www.wiwi.uni- | |||
| ISBN 978-953-184-152-8, June 2011, <https://www.wiwi.uni- | ||||
| due.de/fileadmin/fileupload/I-TDR/SCTP/Paper/ | due.de/fileadmin/fileupload/I-TDR/SCTP/Paper/ | |||
| ConTEL2011.pdf>. | PFLDNeT2010.pdf>. | |||
| [Dre2012] Dreibholz, T., "Evaluation and Optimisation of Multi-Path | ||||
| Transport using the Stream Control Transmission | ||||
| Protocol", Habilitation Treatise, March 2012, | ||||
| <https://duepublico.uni-duisburg- | ||||
| essen.de/servlets/DerivateServlet/Derivate-29737/ | ||||
| Dre2012_final.pdf>. | ||||
| [Globecom2010] | [8] Dreibholz, T., Becke, M., Rathgeb, E. P., and M. Tüxen, | |||
| Dreibholz, T., Becke, M., Rathgeb, E., and M. Tuexen, "On | "On the Use of Concurrent Multipath Transfer over | |||
| the Use of Concurrent Multipath Transfer over Asymmetric | Asymmetric Paths", Proceedings of the IEEE Global | |||
| Paths", Proceedings of the IEEE Global Communications | Communications | |||
| Conference (GLOBECOM) ISBN 978-1-4244-5637-6, | Conference (GLOBECOM) ISBN 978-1-4244-5637-6, | |||
| DOI 10.1109/GLOCOM.2010.5683579, December 2010, | DOI 10.1109/GLOCOM.2010.5683579, 7 December 2010, | |||
| <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | |||
| TDR/SCTP/Paper/Globecom2010.pdf>. | TDR/SCTP/Paper/Globecom2010.pdf>. | |||
| [NorNet-Website] | [9] Adhari, H., Dreibholz, T., Becke, M., Rathgeb, E. P., and | |||
| Dreibholz, T., "NorNet - A Real-World, Large-Scale Multi- | M. Tüxen, "Evaluation of Concurrent Multipath Transfer | |||
| Homing Testbed", Online: https://www.nntb.no/, 2019, | over Dissimilar Paths", Proceedings of the 1st | |||
| <https://www.nntb.no/>. | International Workshop on Protocols and Applications with | |||
| Multi-Homing Support (PAMS) Pages 708-714, | ||||
| ISBN 978-0-7695-4338-3, DOI 10.1109/WAINA.2011.92, 22 | ||||
| March 2011, <https://www.wiwi.uni- | ||||
| due.de/fileadmin/fileupload/I-TDR/SCTP/Paper/ | ||||
| PAMS2011.pdf>. | ||||
| [PAMS2011] | [10] Dreibholz, T., Becke, M., Adhari, H., and E. P. Rathgeb, | |||
| Adhari, H., Dreibholz, T., Becke, M., Rathgeb, E., and M. | "On the Impact of Congestion Control for Concurrent | |||
| Tuexen, "Evaluation of Concurrent Multipath Transfer over | Multipath Transfer on the Transport Layer", Proceedings of | |||
| Dissimilar Paths", Proceedings of the 1st International | the 11th IEEE International Conference on | |||
| Workshop on Protocols and Applications with Multi-Homing | Telecommunications (ConTEL) Pages 397-404, | |||
| Support (PAMS) Pages 708-714, ISBN 978-0-7695-4338-3, | ISBN 978-953-184-152-8, 16 June 2011, | |||
| DOI 10.1109/WAINA.2011.92, March 2011, | ||||
| <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | |||
| TDR/SCTP/Paper/PAMS2011.pdf>. | TDR/SCTP/Paper/ConTEL2011.pdf>. | |||
| [PAMS2012] | [11] Dreibholz, T., Becke, M., Adhari, H., and E. P. Rathgeb, | |||
| Dreibholz, T., Adhari, H., Becke, M., and E. Rathgeb, | "Evaluation of A New Multipath Congestion Control Scheme | |||
| using the NetPerfMeter Tool-Chain", Proceedings of the | ||||
| 19th IEEE International Conference on Software, | ||||
| Telecommunications and Computer Networks (SoftCOM) Pages | ||||
| 1-6, ISBN 978-953-290-027-9, 16 September 2011, | ||||
| <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | ||||
| TDR/SCTP/Paper/SoftCOM2011.pdf>. | ||||
| [12] Dreibholz, T., Adhari, H., Becke, M., and E. P. Rathgeb, | ||||
| "Simulation and Experimental Evaluation of Multipath | "Simulation and Experimental Evaluation of Multipath | |||
| Congestion Control Strategies", Proceedings of the 2nd | Congestion Control Strategies", Proceedings of the 2nd | |||
| International Workshop on Protocols and Applications with | International Workshop on Protocols and Applications with | |||
| Multi-Homing Support (PAMS) ISBN 978-0-7695-4652-0, | Multi-Homing Support (PAMS) ISBN 978-0-7695-4652-0, | |||
| DOI 10.1109/WAINA.2012.186, March 2012, | DOI 10.1109/WAINA.2012.186, 29 March 2012, | |||
| <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | |||
| TDR/SCTP/Paper/PAMS2012.pdf>. | TDR/SCTP/Paper/PAMS2012.pdf>. | |||
| [PAMS2013-NorNet] | [13] Dreibholz, T., "Evaluation and Optimisation of Multi-Path | |||
| Dreibholz, T. and E. Gran, "Design and Implementation of | Transport using the Stream Control Transmission | |||
| the NorNet Core Research Testbed for Multi-Homed Systems", | Protocol", Habilitation Treatise, 13 March 2012, | |||
| Proceedings of the 3nd International Workshop on Protocols | <https://duepublico.uni-duisburg- | |||
| and Applications with Multi-Homing Support (PAMS) Pages | essen.de/servlets/DerivateServlet/Derivate-29737/ | |||
| 1094-1100, ISBN 978-0-7695-4952-1, | Dre2012_final.pdf>. | |||
| DOI 10.1109/WAINA.2013.71, March 2013, | ||||
| [14] Dreibholz, T. and E. G. Gran, "Design and Implementation | ||||
| of the NorNet Core Research Testbed for Multi-Homed | ||||
| Systems", Proceedings of the 3nd International Workshop on | ||||
| Protocols and Applications with Multi-Homing | ||||
| Support (PAMS) Pages 1094-1100, ISBN 978-0-7695-4952-1, | ||||
| DOI 10.1109/WAINA.2013.71, 27 March 2013, | ||||
| <https://www.simula.no/file/ | <https://www.simula.no/file/ | |||
| threfereedinproceedingsreference2012-12-207643198512pdf/ | threfereedinproceedingsreference2012-12-207643198512pdf/ | |||
| download>. | download>. | |||
| [PFLDNeT2010] | [15] Gran, E. G., Dreibholz, T., and A. Kvalbein, "NorNet Core | |||
| Dreibholz, T., Seggelmann, R., Tuexen, M., and E. Rathgeb, | – A Multi-Homed Research Testbed", Computer Networks, | |||
| "Transmission Scheduling Optimizations for Concurrent | Special Issue on Future Internet Testbeds Volume 61, Pages | |||
| Multipath Transfer", Proceedings of the 8th International | 75-87, ISSN 1389-1286, DOI 10.1016/j.bjp.2013.12.035, 14 | |||
| Workshop on Protocols for Future, Large-Scale and Diverse | March 2014, | |||
| Network Transports (PFLDNeT) Volume 8, ISSN 2074-5168, | <https://www.simula.no/file/simulasimula2236pdf/download>. | |||
| November 2010, <https://www.wiwi.uni- | ||||
| due.de/fileadmin/fileupload/I-TDR/SCTP/Paper/ | ||||
| PFLDNeT2010.pdf>. | ||||
| [SoftCOM2011] | [16] Dreibholz, T., "NorNet – A Real-World, Large-Scale Multi- | |||
| Dreibholz, T., Becke, M., Adhari, H., and E. Rathgeb, | Homing Testbed", 2022, <https://www.nntb.no/>. | |||
| "Evaluation of A New Multipath Congestion Control Scheme | ||||
| using the NetPerfMeter Tool-Chain", Proceedings of the | ||||
| 19th IEEE International Conference on Software, | ||||
| Telecommunications and Computer Networks (SoftCOM) Pages | ||||
| 1-6, ISBN 978-953-290-027-9, September 2011, | ||||
| <https://www.wiwi.uni-due.de/fileadmin/fileupload/I- | ||||
| TDR/SCTP/Paper/SoftCOM2011.pdf>. | ||||
| Authors' Addresses | Authors' Addresses | |||
| Thomas Dreibholz | Thomas Dreibholz | |||
| Simula Metropolitan Centre for Digital Engineering | Simula Metropolitan Centre for Digital Engineering | |||
| Pilestredet 52 | Pilestredet 52 | |||
| 0167 Oslo, Oslo | 0167 Oslo | |||
| Norway | Norway | |||
| Phone: +47-6782-8200 | ||||
| Fax: +47-6782-8201 | ||||
| Email: dreibh@simula.no | Email: dreibh@simula.no | |||
| URI: https://www.simula.no/people/dreibh | URI: https://www.simula.no/people/dreibh | |||
| Robin Seggelmann | Robin Seggelmann | |||
| Muenster University of Applied Sciences | Münster University of Applied Sciences | |||
| Stegerwaldstrasse 39 | Stegerwaldstraße 39 | |||
| 48565 Steinfurt, Nordrhein-Westfalen | 48565 Steinfurt | |||
| Germany | Germany | |||
| Email: seggelmann@fh-muenster.de | Email: seggelmann@fh-muenster.de | |||
| Martin Becke | Martin Becke | |||
| HAW Hamburg, Informatics Department | HAW Hamburg, Informatics Department | |||
| Berliner Tor 7 | Berliner Tor 7 | |||
| 20099 Hamburg, Hamburg | 20099 Hamburg | |||
| Germany | Germany | |||
| Phone: +49-40-42875-8104 | Phone: +49-40-42875-8104 | |||
| Fax: +49-40-42875-8309 | ||||
| Email: martin.becke@haw-hamburg.de | Email: martin.becke@haw-hamburg.de | |||
| URI: http://www.scimbe.de/about.html | URI: http://www.scimbe.de/about.html | |||
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