Publications
Proceedings, refereed
Network Path Integrity Verification using Deterministic Delay Measurements
In TMA Conference 2022. IEEE/IFIP, 2022.Status: Published
Network Path Integrity Verification using Deterministic Delay Measurements
With the intuition that every device on the data path contributes to the end-to-end delay, we propose a simple and deterministic measurement-based approach for detecting the insertion of a layer-2 switch on the data path of a network operator.
For this purpose, we use commodity hardware and the standard ping tool for collecting ICMP RTTs.
To minimise inaccuracies in the measurements, we increase timing determinism on both ICMP source and target by using a real-time kernel on both, a dedicated source (a Linux server) and target (an RPI4 with custom image). Additionally, we manipulate real-time attributes for prioritising the ping process. By using this approach on different loaded networks: lab, campus network, research and education network and an ISP, we are able to reliably detect that a switch was added at the end of the path or within it.
Our method yields an excellent performance on networks with considerable cross traffic as well as lightly loaded networks.
| Afilliation | Communication Systems |
| Project(s) | The Center for Resilient Networks and Applications, GAIA |
| Publication Type | Proceedings, refereed |
| Year of Publication | 2022 |
| Conference Name | TMA Conference 2022 |
| Publisher | IEEE/IFIP |
| ISBN Number | 978-3-903176-47-8 |
| Keywords | alien switch, deterministic RTT, network |
Journal Article
A Multi-Perspective Study of Internet Performance during the COVID-19 Outbreak
Arxiv (2021).Status: Published
A Multi-Perspective Study of Internet Performance during the COVID-19 Outbreak
| Afilliation | Communication Systems |
| Project(s) | Simula Metropolitan Center for Digital Engineering, GAIA |
| Publication Type | Journal Article |
| Year of Publication | 2021 |
| Journal | Arxiv |
| Publisher | Arxiv |
| Place Published | Arrxiv.org |
| Keywords | COVID, Internet, network |
| DOI | 10.48550/arXiv.2101.05030 |
Proceedings, refereed
A first look at the African's ccTLDs technical environment
In International Conference on e-Infrastructure and e-Services for Developing Countries. Springer, 2020.Status: Published
A first look at the African's ccTLDs technical environment
Leveraging multiple datasets, we evaluate the current status of African ccTLDs technical environment with regard to best practices. Compared to the top 10 ccTLDs, African ccTLDs appear to have enough IPs to maintain service availability while handling authoritative DNS queries. With regard to the early stage of IPv6 deployment in the AFRINIC region, it is interesting to note that 94% of African ccTLDs support IPv6. This is due to the huge adoption of out of region or offshore DNS anycast provider. The majority (84%) of African anycast traffic is handled by non-profit foundations and/or organisations using resources from other RIRs such as RIPE-NCC and ARIN. Furthermore, less than 30% (16) of African ccTLD have signed their zone. From this group, the majority is using the recommended algorithm RSASHA256 (Algorithm 8) as suggested by BCP 14. Strangely some African ccTLDs lack basic DNS configuration such as missing PTR records, lame delegation, EDNS compliance and consistent serial numbers. These misconfigurations can be easily fixed with consistent monitoring or the use of modern automated registry software which comes with internal checks. Overall, African ccTLDs are characterised by the usage of out of region resources.
| Afilliation | Communication Systems |
| Project(s) | The Center for Resilient Networks and Applications, GAIA |
| Publication Type | Proceedings, refereed |
| Year of Publication | 2020 |
| Conference Name | International Conference on e-Infrastructure and e-Services for Developing Countries |
| Publisher | Springer |
| Keywords | African ccTLDs, authoritative, dns, Measurements |