title: Network hygiene, incentives, and regulation:  Deployment of source address validation in the internet

authors: Luckie, Matthew John

subjects: computer science

abstract: The Spoofer project has collected data on the deployment and characteristics of IP source address validation on the Internet since 2005. Data from the project comes from participants who install an active probing client that runs in the background. The client automatically runs tests both periodically and when it detects a new network attachment point. We analyze the rich dataset of Spoofer tests in multiple dimensions: across time, networks, autonomous systems, countries, and by Internet protocol version. In our data for the year ending August 2019, at least a quarter of tested ASes did not filter packets with spoofed source addresses leaving their networks. We show that routers performing Network Address Translation do not always filter spoofed packets, as 6.4% of IPv4/24 tested in the year ending August 2019 did not filter. Worse, at least two thirds of tested ASes did not filter packets entering their networks with source addresses claiming to be from within their network that arrived from outside their network. We explore several approaches to encouraging remediation and the challenges of evaluating their impact. While we have been able to remediate 352 IPv4/24, we have found an order of magnitude more IPv4/24 that remains unremediated, despite myriad remediation strategies, with 21% unremediated for more than six months. Our analysis provides the most complete and confident picture of the Internet's susceptibility to date of this long-standing vulnerability. Although there is no simple solution to address the remaining long-tail of unremediated networks, we conclude with a discussion of possible non-technical interventions, and demonstrate how the platform can support evaluation of the impact of such interventions over time.

text: Network hygiene, incentives, and regulation:  Deployment of source address validation in the internet The Spoofer project has collected data on the deployment and characteristics of IP source address validation on the Internet since 2005. Data from the project comes from participants who install an active probing client that runs in the background. The client automatically runs tests both periodically and when it detects a new network attachment point. We analyze the rich dataset of Spoofer tests in multiple dimensions: across time, networks, autonomous systems, countries, and by Internet protocol version. In our data for the year ending August 2019, at least a quarter of tested ASes did not filter packets with spoofed source addresses leaving their networks. We show that routers performing Network Address Translation do not always filter spoofed packets, as 6.4% of IPv4/24 tested in the year ending August 2019 did not filter. Worse, at least two thirds of tested ASes did not filter packets entering their networks with source addresses claiming to be from within their network that arrived from outside their network. We explore several approaches to encouraging remediation and the challenges of evaluating their impact. While we have been able to remediate 352 IPv4/24, we have found an order of magnitude more IPv4/24 that remains unremediated, despite myriad remediation strategies, with 21% unremediated for more than six months. Our analysis provides the most complete and confident picture of the Internet's susceptibility to date of this long-standing vulnerability. Although there is no simple solution to address the remaining long-tail of unremediated networks, we conclude with a discussion of possible non-technical interventions, and demonstrate how the platform can support evaluation of the impact of such interventions over time.

year: 2019

title: Improving polypropylene matrix composites reinforced with aligned hemp fibre mats using high fibre contents

authors: Sunny, Tom

abstract: The main goal of this study was to improve the mechanical performance of polypropylene (PP) matrix composites through high hemp fibre content. In order to achieve high fibre content, the possibilities of different polymer sheet thicknesses and stacking arrangements were investigated. It was found that decreasing the overall thickness of fibre mats between two polymer sheets within the stacking arrangements of composites and so decreasing the distance the polymer needs to travel improved the fibre wetting and therefore improved the tensile properties. The strongest composite produced had a fibre content of about 60 wt%. At this fibre content, tensile strength and Young’s modulus of the composites were found to be 3.0 and 6.9 times, respectively, higher than the control samples (polymer only samples), while figures for flexural strength and flexural modulus were 3.4 and 3.6, respectively.

text: Improving polypropylene matrix composites reinforced with aligned hemp fibre mats using high fibre contents The main goal of this study was to improve the mechanical performance of polypropylene (PP) matrix composites through high hemp fibre content. In order to achieve high fibre content, the possibilities of different polymer sheet thicknesses and stacking arrangements were investigated. It was found that decreasing the overall thickness of fibre mats between two polymer sheets within the stacking arrangements of composites and so decreasing the distance the polymer needs to travel improved the fibre wetting and therefore improved the tensile properties. The strongest composite produced had a fibre content of about 60 wt%. At this fibre content, tensile strength and Young’s modulus of the composites were found to be 3.0 and 6.9 times, respectively, higher than the control samples (polymer only samples), while figures for flexural strength and flexural modulus were 3.4 and 3.6, respectively.

year: 2022

title: Reclaiming Kaitiakitanga : An intergenerational perspective of Kaitiakitanga within Te Parawhau

authors: Walker, Erana

subjects: Kaitiakitanga

abstract: Kaitiakitanga is a concept that is utilised widely throughout the Māori world for the protection and preservation of cultural aspects to Māori. Through years of application by westernised mainstream processes the value has largely been restricted to the realms of environmental protection. This restriction has often been the result of misinterpretation of Kaitiakitanga and its relevance as a concept to Māori. The purpose of the thesis is to question how the perspective of Kaitiakitanga is constructed in the minds of representatives from the hapū of Te Parawhau. To test for variance, the research spans across two generations of hapū members. Using Whakawhiti Kōrero for data collection as well as Kaupapa Māori methodology as guidance, the thesis explores perspectives of two generations of Te Parawhau descendants around Kaitiakitanga and how it can be developed to aid in the growth and prosperity of the hapū. Key themes highlighted by the analysis encompass ideas of connectedness as well as spiritual, physical, environmental and human elements of responsibility and obligation. The thesis introduces a distinct Te Parawhau analytical framework for its analysis of rich kōrero by hapū members in relation to Kaitiakitanga. Through this framework the value of Kaitiakitanga is tested for relevance to Te Parawhau and its future development. The world view of Te Parawhau has formed the basis of participant perspectives around Kaitiakitanga and leads the researcher to consider that such knowledge is important to the future functionality of Māori value’s. The thesis concludes to show that there are indeed differences in application and perspectives of Kaitiakitanga within the hapū of Te Parawhau.

text: Reclaiming Kaitiakitanga : An intergenerational perspective of Kaitiakitanga within Te Parawhau Kaitiakitanga is a concept that is utilised widely throughout the Māori world for the protection and preservation of cultural aspects to Māori. Through years of application by westernised mainstream processes the value has largely been restricted to the realms of environmental protection. This restriction has often been the result of misinterpretation of Kaitiakitanga and its relevance as a concept to Māori. The purpose of the thesis is to question how the perspective of Kaitiakitanga is constructed in the minds of representatives from the hapū of Te Parawhau. To test for variance, the research spans across two generations of hapū members. Using Whakawhiti Kōrero for data collection as well as Kaupapa Māori methodology as guidance, the thesis explores perspectives of two generations of Te Parawhau descendants around Kaitiakitanga and how it can be developed to aid in the growth and prosperity of the hapū. Key themes highlighted by the analysis encompass ideas of connectedness as well as spiritual, physical, environmental and human elements of responsibility and obligation. The thesis introduces a distinct Te Parawhau analytical framework for its analysis of rich kōrero by hapū members in relation to Kaitiakitanga. Through this framework the value of Kaitiakitanga is tested for relevance to Te Parawhau and its future development. The world view of Te Parawhau has formed the basis of participant perspectives around Kaitiakitanga and leads the researcher to consider that such knowledge is important to the future functionality of Māori value’s. The thesis concludes to show that there are indeed differences in application and perspectives of Kaitiakitanga within the hapū of Te Parawhau.

year: 2016