Check for updates Assessing the Impact of DNS Configuration
- Okuthe, J A, Terzoli, Alfredo
- Authors: Okuthe, J A , Terzoli, Alfredo
- Date: 2023
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430917 , vital:72727 , https://doi.org/10.1007/978-3-031-34896-9
- Description: Domain name system (DNS) is an essential enabler for connecting us-ers and services on the Internet. DNS translates human readable do-main names into IP addresses and precedes client connection to a server via a domain name. DNS service is therefore expected to con-sume network bandwidth even though it offers no direct benefit to the user. Having observed the large component of DNS traffic on the com-munity network local loop in our previous study, we migrated the DNS service from a server on the LAN to the gateway router and reconfig-ured the cache time-to-live. Results from the analysis of network traffic captured from the gateway router interface show a 26% decrease in the downlink bandwidth utilization and 46% decline in the uplink bandwidth utilization. The DNS component of the local loop traffic reduces from 45.28% to 4.11%. On the other hand, the Web component of the local loop traffic increases from 49.42% to 95.49%. Data collected from a mirroring port on the LAN switch indicate a decrease in the DNS portion of the internal traffic from 0.38% to 0.18%. Although the DNS reconfigu-ration helps alleviate network bandwidth constraints and reduces DNS component of the traffic, the Web portion increases. The implementa-tion of effective, efficient and sustainable Web traffic management is therefore required.
- Full Text:
- Date Issued: 2023
- Authors: Okuthe, J A , Terzoli, Alfredo
- Date: 2023
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430917 , vital:72727 , https://doi.org/10.1007/978-3-031-34896-9
- Description: Domain name system (DNS) is an essential enabler for connecting us-ers and services on the Internet. DNS translates human readable do-main names into IP addresses and precedes client connection to a server via a domain name. DNS service is therefore expected to con-sume network bandwidth even though it offers no direct benefit to the user. Having observed the large component of DNS traffic on the com-munity network local loop in our previous study, we migrated the DNS service from a server on the LAN to the gateway router and reconfig-ured the cache time-to-live. Results from the analysis of network traffic captured from the gateway router interface show a 26% decrease in the downlink bandwidth utilization and 46% decline in the uplink bandwidth utilization. The DNS component of the local loop traffic reduces from 45.28% to 4.11%. On the other hand, the Web component of the local loop traffic increases from 49.42% to 95.49%. Data collected from a mirroring port on the LAN switch indicate a decrease in the DNS portion of the internal traffic from 0.38% to 0.18%. Although the DNS reconfigu-ration helps alleviate network bandwidth constraints and reduces DNS component of the traffic, the Web portion increases. The implementa-tion of effective, efficient and sustainable Web traffic management is therefore required.
- Full Text:
- Date Issued: 2023
Assessing the Impact of DNS Configuration on Low Bandwidth Networks
- Okuthe, J A, Terzoli, Alfredo
- Authors: Okuthe, J A , Terzoli, Alfredo
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430903 , vital:72726 , https://doi.org/10.1007/978-3-031-34896-9_6
- Description: Domain name system (DNS) is an essential enabler for connecting us-ers and services on the Internet. DNS translates human readable do-main names into IP addresses and precedes client connection to a server via a domain name. DNS service is therefore expected to con-sume network bandwidth even though it offers no direct benefit to the user. Having observed the large component of DNS traffic on the com-munity network local loop in our previous study, we migrated the DNS service from a server on the LAN to the gateway router and reconfig-ured the cache time-to-live. Results from the analysis of network traffic captured from the gateway router interface show a 26% decrease in the downlink bandwidth utilization and 46% decline in the uplink bandwidth utilization. The DNS component of the local loop traffic reduces from 45.28% to 4.11%. On the other hand, the Web component of the local loop traffic increases from 49.42% to 95.49%. Data collected from a mirroring port on the LAN switch indicate a decrease in the DNS portion of the internal traffic from 0.38% to 0.18%. Although the DNS reconfigu-ration helps alleviate network bandwidth constraints and reduces DNS component of the traffic, the Web portion increases. The implementa-tion of effective, efficient and sustainable Web traffic management is therefore required.
- Full Text:
- Date Issued: 2022
- Authors: Okuthe, J A , Terzoli, Alfredo
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430903 , vital:72726 , https://doi.org/10.1007/978-3-031-34896-9_6
- Description: Domain name system (DNS) is an essential enabler for connecting us-ers and services on the Internet. DNS translates human readable do-main names into IP addresses and precedes client connection to a server via a domain name. DNS service is therefore expected to con-sume network bandwidth even though it offers no direct benefit to the user. Having observed the large component of DNS traffic on the com-munity network local loop in our previous study, we migrated the DNS service from a server on the LAN to the gateway router and reconfig-ured the cache time-to-live. Results from the analysis of network traffic captured from the gateway router interface show a 26% decrease in the downlink bandwidth utilization and 46% decline in the uplink bandwidth utilization. The DNS component of the local loop traffic reduces from 45.28% to 4.11%. On the other hand, the Web component of the local loop traffic increases from 49.42% to 95.49%. Data collected from a mirroring port on the LAN switch indicate a decrease in the DNS portion of the internal traffic from 0.38% to 0.18%. Although the DNS reconfigu-ration helps alleviate network bandwidth constraints and reduces DNS component of the traffic, the Web portion increases. The implementa-tion of effective, efficient and sustainable Web traffic management is therefore required.
- Full Text:
- Date Issued: 2022
Implementing a Content-Based Routing Framework for Application Integration on to Teleweaver Application Server
- Ngwenya, Sikhumbuzo, Shibeshi, Zelalem S, Terzoli, Alfredo
- Authors: Ngwenya, Sikhumbuzo , Shibeshi, Zelalem S , Terzoli, Alfredo
- Date: 2021
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430580 , vital:72701 , https://ieeexplore.ieee.org/abstract/document/9576969
- Description: This paper presents an architectural overview of content-based dynam-ic routing for integrating applications on to an application server named TeleWeaver, a middleware platform developed within Siyakhula Living Lab (SLL). SLL is an ICT4D project in the Eastern Cape Province of South Africa. TeleWeaver was created as a mediation layer between software systems developed for use by beneficiaries of the Siyakhula Living Lab. The main challenge with these disparate systems was that they had unnecessary, redundant components; TeleWeaver acts as a common platform that suits the development of many services such as eGovernment, eHealth, and eJudiciary.
- Full Text:
- Date Issued: 2021
- Authors: Ngwenya, Sikhumbuzo , Shibeshi, Zelalem S , Terzoli, Alfredo
- Date: 2021
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430580 , vital:72701 , https://ieeexplore.ieee.org/abstract/document/9576969
- Description: This paper presents an architectural overview of content-based dynam-ic routing for integrating applications on to an application server named TeleWeaver, a middleware platform developed within Siyakhula Living Lab (SLL). SLL is an ICT4D project in the Eastern Cape Province of South Africa. TeleWeaver was created as a mediation layer between software systems developed for use by beneficiaries of the Siyakhula Living Lab. The main challenge with these disparate systems was that they had unnecessary, redundant components; TeleWeaver acts as a common platform that suits the development of many services such as eGovernment, eHealth, and eJudiciary.
- Full Text:
- Date Issued: 2021
TeleWeaver: an architectural overview of a customised application server for rurality
- Tsietsi, Mosiuoa, Terzoli, Alfredo, Gumbo, Sibukelo
- Authors: Tsietsi, Mosiuoa , Terzoli, Alfredo , Gumbo, Sibukelo
- Date: 2016
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430624 , vital:72704 , 10.1109/ISTAFRICA.2016.7530616
- Description: The Siyakhula Living Lab in the rural Eastern Cape province of South Africa has been in existence for over a decade now. In this time, sever-al software artefacts have been developed by students and partners with the aim of providing contextually-relevant services to the rural community. However, reliance on different platforms and paradigms has meant that the deployment of such services would be difficult to implement and maintain reliably in actual practice. What is required is a single software platform that can act as a docking station for multiple applications, as well as a routing substrate for applications living inside and outside the platform. A candidate platform to enable this is currently being integrated under the codename Teleweaver and is built from a free, open source J2EE application server and integrates with other software components. This paper provides an architectural overview of the platform and demonstrates how it provides a sustainable context for application development going forward.
- Full Text:
- Date Issued: 2016
- Authors: Tsietsi, Mosiuoa , Terzoli, Alfredo , Gumbo, Sibukelo
- Date: 2016
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430624 , vital:72704 , 10.1109/ISTAFRICA.2016.7530616
- Description: The Siyakhula Living Lab in the rural Eastern Cape province of South Africa has been in existence for over a decade now. In this time, sever-al software artefacts have been developed by students and partners with the aim of providing contextually-relevant services to the rural community. However, reliance on different platforms and paradigms has meant that the deployment of such services would be difficult to implement and maintain reliably in actual practice. What is required is a single software platform that can act as a docking station for multiple applications, as well as a routing substrate for applications living inside and outside the platform. A candidate platform to enable this is currently being integrated under the codename Teleweaver and is built from a free, open source J2EE application server and integrates with other software components. This paper provides an architectural overview of the platform and demonstrates how it provides a sustainable context for application development going forward.
- Full Text:
- Date Issued: 2016
A Comparison of Four End-User Devices as Thin Clients for Public Access to the Internet in Poor Communities
- Duff, Kevin, Siebörger, Ingrid, Terzoli, Alfredo
- Authors: Duff, Kevin , Siebörger, Ingrid , Terzoli, Alfredo
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430892 , vital:72725 , https://doi.org/10.1007/978-3-319-16886-9_24
- Description: In poor areas, where ICT infrastructure is being deployed with devel-opmental aims, there is a need to provide appropriate, sustainable technologies that meet the needs of the local community. Current trends for ICT interventions favour the use of mobile user equipment, such as tablets and cellphones, but we think that they are inappropriate to allow production as opposed to mainly consumption of digital con-tent, at least for the foreseeable future. Thus our objective is to reduce the cost of deployment of traditional communal Internet Access Points using PCs. In this paper we compare four candidate computers to be used as thin clients in such settings, according to seven different cate-gories. Our study identifies the strengths, weaknesses and problems of each device, and concludes with recommendations for anybody wish-ing to deploy such devices as Linux Terminal Server Project (LTSP) thin clients in a public Internet Access Point.
- Full Text:
- Date Issued: 2015
- Authors: Duff, Kevin , Siebörger, Ingrid , Terzoli, Alfredo
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430892 , vital:72725 , https://doi.org/10.1007/978-3-319-16886-9_24
- Description: In poor areas, where ICT infrastructure is being deployed with devel-opmental aims, there is a need to provide appropriate, sustainable technologies that meet the needs of the local community. Current trends for ICT interventions favour the use of mobile user equipment, such as tablets and cellphones, but we think that they are inappropriate to allow production as opposed to mainly consumption of digital con-tent, at least for the foreseeable future. Thus our objective is to reduce the cost of deployment of traditional communal Internet Access Points using PCs. In this paper we compare four candidate computers to be used as thin clients in such settings, according to seven different cate-gories. Our study identifies the strengths, weaknesses and problems of each device, and concludes with recommendations for anybody wish-ing to deploy such devices as Linux Terminal Server Project (LTSP) thin clients in a public Internet Access Point.
- Full Text:
- Date Issued: 2015
Living lab methodology as an approach to innovation in ICT4D: The Siyakhula Living Lab experience
- Gumbo, Sibukelo, Thinyane, Hannah, Thinyane, Mamello, Terzoli, Alfredo, Hansen, Susan
- Authors: Gumbo, Sibukelo , Thinyane, Hannah , Thinyane, Mamello , Terzoli, Alfredo , Hansen, Susan
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431302 , vital:72762 , https://www.siyakhulall.com/sites/default/files/ISTAfrica_Paper_ref_18_doc_4809_0.pdf
- Description: Underdevelopment and poverty represent key challenges faced by the modern world, which have attracted the attention of NGOs, civil society, government and multinationals. Various undertakings including the United Nations Millennium Development Goals articulation and the World Summit on Information Society highlight the global commitment towards addressing these problems. The solutions to these problems should be derived out of well-structured innovation systems that take into consideration the grassroot context and concerns. A number of in-novation models have been formulated and utilized effectively in differ-ent industries, and some of these have equally been used effectively in community development contexts. This paper elaborates on the Living Lab methodology and its application in ICT4D contexts, highlighting the effectiveness of this model towards integrating end-users within their problem solving effort. This is discussed through the backdrop of the Siyakhula Living Lab, an ICT4D intervention. The embedding environ-ment for this model, which enables key synergies with other stakehold-ers, is also discussed.
- Full Text:
- Date Issued: 2012
- Authors: Gumbo, Sibukelo , Thinyane, Hannah , Thinyane, Mamello , Terzoli, Alfredo , Hansen, Susan
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431302 , vital:72762 , https://www.siyakhulall.com/sites/default/files/ISTAfrica_Paper_ref_18_doc_4809_0.pdf
- Description: Underdevelopment and poverty represent key challenges faced by the modern world, which have attracted the attention of NGOs, civil society, government and multinationals. Various undertakings including the United Nations Millennium Development Goals articulation and the World Summit on Information Society highlight the global commitment towards addressing these problems. The solutions to these problems should be derived out of well-structured innovation systems that take into consideration the grassroot context and concerns. A number of in-novation models have been formulated and utilized effectively in differ-ent industries, and some of these have equally been used effectively in community development contexts. This paper elaborates on the Living Lab methodology and its application in ICT4D contexts, highlighting the effectiveness of this model towards integrating end-users within their problem solving effort. This is discussed through the backdrop of the Siyakhula Living Lab, an ICT4D intervention. The embedding environ-ment for this model, which enables key synergies with other stakehold-ers, is also discussed.
- Full Text:
- Date Issued: 2012
The deployment of an e-commerce platform and related projects in a rural area in South Africa
- Dalvit, Lorenzo, Muyingi, H Hyppolite, Terzoli, Alfredo, Thinyane, Mamello
- Authors: Dalvit, Lorenzo , Muyingi, H Hyppolite , Terzoli, Alfredo , Thinyane, Mamello
- Date: 2007
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428545 , vital:72519 , https://nru.uncst.go.ug/bitstream/handle/123456789/6552/Information%20Communica-tion%20Technologies%20%20page%20410.pdf?sequence=1andisAllowed=y#page=256
- Description: In our paper we describe the development and deployment of an ecommerce platform in Dwesa, a rural area in the former homeland of Transkei in South Africa. The system is designed to promote tourism and advertise local arts, crafts and music, and it entails a number of re-lated projects. Deployment of infrastructure, technical support, promo-tion of the initiative and teaching of computer literacy take place during monthly visits of approximately one week, and involve young research-ers from two universities (one previously disadvantaged; the other his-torically privileged). This ensures a synergy between technical exper-tise and understanding of the local context. Findings so far emphasise the importance of contextualising the intervention to suit local needs and adjust to the local context. The platform is currently being extended to include e-government, e-learning and e-health capabilities. If proven successful, this model can be exported to similar areas in South africa and in the rest of Africa. This could open up potential opportunities for the still unexplored market for ICT in rural Africa.
- Full Text:
- Date Issued: 2007
- Authors: Dalvit, Lorenzo , Muyingi, H Hyppolite , Terzoli, Alfredo , Thinyane, Mamello
- Date: 2007
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428545 , vital:72519 , https://nru.uncst.go.ug/bitstream/handle/123456789/6552/Information%20Communica-tion%20Technologies%20%20page%20410.pdf?sequence=1andisAllowed=y#page=256
- Description: In our paper we describe the development and deployment of an ecommerce platform in Dwesa, a rural area in the former homeland of Transkei in South Africa. The system is designed to promote tourism and advertise local arts, crafts and music, and it entails a number of re-lated projects. Deployment of infrastructure, technical support, promo-tion of the initiative and teaching of computer literacy take place during monthly visits of approximately one week, and involve young research-ers from two universities (one previously disadvantaged; the other his-torically privileged). This ensures a synergy between technical exper-tise and understanding of the local context. Findings so far emphasise the importance of contextualising the intervention to suit local needs and adjust to the local context. The platform is currently being extended to include e-government, e-learning and e-health capabilities. If proven successful, this model can be exported to similar areas in South africa and in the rest of Africa. This could open up potential opportunities for the still unexplored market for ICT in rural Africa.
- Full Text:
- Date Issued: 2007
Computers and African languages in education: an ICT tool for the promotion of multilingualism at a South African university: conversations
- Dalvit, Lorenzo, Murray, Sarah, Mini, Buyiswa, Terzoli, Alfredo, Zhao, Xiaogeng
- Authors: Dalvit, Lorenzo , Murray, Sarah , Mini, Buyiswa , Terzoli, Alfredo , Zhao, Xiaogeng
- Date: 2005
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428911 , vital:72545 , https://hdl.handle.net/10520/EJC87340
- Description: This article describes a web-based application designed to provide meaningful access to the study of Computer Science to speakers of an African language who have limited experience of using English for ac-ademic purposes. Our research is focused upon students of Computer Skills in the Extended Studies Programme at Rhodes University who have studied English as a second language for the matriculation exam-ination. The intervention involves the cooperative production and shar-ing of multilingual support material in both English and the students' home languages. The article illustrates how the use of computers has the potential to solve some of the problems traditionally associated with the use of African languages as additional media of instruction in ter-tiary education (i.e. lack of terminology and resources in the African languages, stigma attached to their use, etc.). We maintain that learning about computers partly in their stronger language (i.e. their home lan-guage) could give students increased and more meaningful access to an educationally and economically empowering field of study.
- Full Text:
- Date Issued: 2005
- Authors: Dalvit, Lorenzo , Murray, Sarah , Mini, Buyiswa , Terzoli, Alfredo , Zhao, Xiaogeng
- Date: 2005
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428911 , vital:72545 , https://hdl.handle.net/10520/EJC87340
- Description: This article describes a web-based application designed to provide meaningful access to the study of Computer Science to speakers of an African language who have limited experience of using English for ac-ademic purposes. Our research is focused upon students of Computer Skills in the Extended Studies Programme at Rhodes University who have studied English as a second language for the matriculation exam-ination. The intervention involves the cooperative production and shar-ing of multilingual support material in both English and the students' home languages. The article illustrates how the use of computers has the potential to solve some of the problems traditionally associated with the use of African languages as additional media of instruction in ter-tiary education (i.e. lack of terminology and resources in the African languages, stigma attached to their use, etc.). We maintain that learning about computers partly in their stronger language (i.e. their home lan-guage) could give students increased and more meaningful access to an educationally and economically empowering field of study.
- Full Text:
- Date Issued: 2005
Securing Real-time multimedia: A brief survey
- Cloran, Russell, Irwin, Barry V W, Terzoli, Alfredo
- Authors: Cloran, Russell , Irwin, Barry V W , Terzoli, Alfredo
- Date: 2005
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428887 , vital:72543 , https://digifors.cs.up.ac.za/issa/2005/Proceedings/Research/020_Article.pdf
- Description: Voice over IP (VoIP) enables cheaper and easier communication but can be less secure than the traditional TDM network. This paper is a guide to securing VoIP networks using current technologies and best practices. Physical and logical segregation of data and multimedia traf-fic is discussed. Current VoIP analysis tools are described with specific reference to their usefulness as a means of evaluating the quality of a secure VoIP system. Protocol enhancements, such as the Secure Re-al-time Transport Protocol and transport layer protection such as of-fered by IPSec, are discussed and evaluated. Finally, various secure VoIP implementation scenarios are discussed, with configurations combining these security solutions presented in the paper.
- Full Text:
- Date Issued: 2005
- Authors: Cloran, Russell , Irwin, Barry V W , Terzoli, Alfredo
- Date: 2005
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428887 , vital:72543 , https://digifors.cs.up.ac.za/issa/2005/Proceedings/Research/020_Article.pdf
- Description: Voice over IP (VoIP) enables cheaper and easier communication but can be less secure than the traditional TDM network. This paper is a guide to securing VoIP networks using current technologies and best practices. Physical and logical segregation of data and multimedia traf-fic is discussed. Current VoIP analysis tools are described with specific reference to their usefulness as a means of evaluating the quality of a secure VoIP system. Protocol enhancements, such as the Secure Re-al-time Transport Protocol and transport layer protection such as of-fered by IPSec, are discussed and evaluated. Finally, various secure VoIP implementation scenarios are discussed, with configurations combining these security solutions presented in the paper.
- Full Text:
- Date Issued: 2005
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