title: AS-Path Prepending: There is no rose without a thorn

authors: Marcos, Pedro

subjects: computer science

abstract: Inbound traffic engineering (ITE) - -the process of announcing routes to, e.g., maximize revenue or minimize congestion - -is an essential task for Autonomous Systems (ASes). AS Path Prepending (ASPP) is an easy to use and well-known ITE technique that routing manuals show as one of the first alternatives to influence other ASes' routing decisions. We observe that origin ASes currently prepend more than 25% of all IPv4 prefixes. ASPP consists of inflating the BGP AS path. Since the length of the AS path is the second tie-breaker in the BGP best path selection, ASPP can steer traffic to other routes. Despite being simple and easy to use, the appreciation of ASPP among operators and researchers is diverse. Some have questioned its need, effectiveness, and predictability, as well as voiced security concerns. Motivated by these mixed views, we revisit ASPP. Our longitudinal study shows that ASes widely deploy ASPP, and its utilization has slightly increased despite public statements against it. We surprisingly spot roughly 6k ASes originating at least one prefix with prepends that achieve no ITE goal. With active measurements, we show that ASPP effectiveness as an ITE tool depends on the AS location and the number of available upstreams; that ASPP security implications are practical; identify that more than 18% of the prepended prefixes contain unnecessary prepends that achieve no apparent goal other than amplifying existing routing security risks. We validate our findings in interviews with 20 network operators.

text: AS-Path Prepending: There is no rose without a thorn Inbound traffic engineering (ITE) - -the process of announcing routes to, e.g., maximize revenue or minimize congestion - -is an essential task for Autonomous Systems (ASes). AS Path Prepending (ASPP) is an easy to use and well-known ITE technique that routing manuals show as one of the first alternatives to influence other ASes' routing decisions. We observe that origin ASes currently prepend more than 25% of all IPv4 prefixes. ASPP consists of inflating the BGP AS path. Since the length of the AS path is the second tie-breaker in the BGP best path selection, ASPP can steer traffic to other routes. Despite being simple and easy to use, the appreciation of ASPP among operators and researchers is diverse. Some have questioned its need, effectiveness, and predictability, as well as voiced security concerns. Motivated by these mixed views, we revisit ASPP. Our longitudinal study shows that ASes widely deploy ASPP, and its utilization has slightly increased despite public statements against it. We surprisingly spot roughly 6k ASes originating at least one prefix with prepends that achieve no ITE goal. With active measurements, we show that ASPP effectiveness as an ITE tool depends on the AS location and the number of available upstreams; that ASPP security implications are practical; identify that more than 18% of the prepended prefixes contain unnecessary prepends that achieve no apparent goal other than amplifying existing routing security risks. We validate our findings in interviews with 20 network operators.

year: 2020

title: Communication in Aotearoa New Zealand: The challenge of engaging globally and acting locally

authors: Henderson, Alison

subjects: New Zealand

abstract: This article outlines the evolution of communication studies within the university sector in Aotearoa New Zealand and how this diverse disciplinary field is situated within the academy through teaching and research. It identifies the highly competitive tertiary education structures and systems that can create disincentives for the collective organising of communication scholars both within and between tertiary institutions. At the same time, it acknowledges the international disciplinary contribution of Aotearoa New Zealand researchers, and recent successful inroads into gaining major grants.

The article reflects on the challenges that come with the need to position ourselves as 'internationally relevant' while also finding ways of developing and supporting local communication studies initiatives, and contributing to the advancement of Aotearoa New Zealand as a bicultural nation.

text: Communication in Aotearoa New Zealand: The challenge of engaging globally and acting locally This article outlines the evolution of communication studies within the university sector in Aotearoa New Zealand and how this diverse disciplinary field is situated within the academy through teaching and research. It identifies the highly competitive tertiary education structures and systems that can create disincentives for the collective organising of communication scholars both within and between tertiary institutions. At the same time, it acknowledges the international disciplinary contribution of Aotearoa New Zealand researchers, and recent successful inroads into gaining major grants.

The article reflects on the challenges that come with the need to position ourselves as 'internationally relevant' while also finding ways of developing and supporting local communication studies initiatives, and contributing to the advancement of Aotearoa New Zealand as a bicultural nation.

year: 2010

title: Software development: Involving Tangata Whenua and incorporating Tikanga Māori

authors: Taia, Ivy

subjects: software engineering

abstract: Over the past fifty years, software development (SD) has been dominated by Western approaches, which is widely accepted as the standard way of doing things (Diaz Andrade et al., 2021). Consequently, many software applications for specific Indigenous cultures, especially health interventions and educational software (Dobson, Whittaker, Bartley, Connor, Chen, Ross & McCool, 2017; Fleer, 1989), were developed using traditional software engineering (SE) methodologies. Although these methodologies provide the workflows and methods for developing software, they do not provide guidelines for developing Indigenous software. While there have been numerous studies on diversity, such as gender and ethnicity in the field of Information Systems, there is very little research on the practices of involving Indigenous people and incorporating their traditional customs in the software development process. This thesis examines the participation of Indigenous people in software development. The research specifically focuses on Tangata Whenua (Māori people, the Indigenous population of Aotearoa New Zealand) and Tikanga Māori (Māori cultural methods). Our findings are useful to those attempting to enhance Indigenous representation in software development, especially those wanting to involve Māori people and their cultural methods in the development process and design of software.

text: Software development: Involving Tangata Whenua and incorporating Tikanga Māori Over the past fifty years, software development (SD) has been dominated by Western approaches, which is widely accepted as the standard way of doing things (Diaz Andrade et al., 2021). Consequently, many software applications for specific Indigenous cultures, especially health interventions and educational software (Dobson, Whittaker, Bartley, Connor, Chen, Ross & McCool, 2017; Fleer, 1989), were developed using traditional software engineering (SE) methodologies. Although these methodologies provide the workflows and methods for developing software, they do not provide guidelines for developing Indigenous software. While there have been numerous studies on diversity, such as gender and ethnicity in the field of Information Systems, there is very little research on the practices of involving Indigenous people and incorporating their traditional customs in the software development process. This thesis examines the participation of Indigenous people in software development. The research specifically focuses on Tangata Whenua (Māori people, the Indigenous population of Aotearoa New Zealand) and Tikanga Māori (Māori cultural methods). Our findings are useful to those attempting to enhance Indigenous representation in software development, especially those wanting to involve Māori people and their cultural methods in the development process and design of software.

year: 2025