Zaznavanje odstopanj prenosnih parametrov v akademskem omrežju ARNES s pomočjo orodja za meritve prepustnosti

Demšar, Matej (author), Kos, Anton (mentor)

Diplomsko delo obravnava merjenje kakovosti storitev v dostopovnem omrežju ARNES, kjer je diagnostika zaradi vpletenosti tretjih ponudnikov zahtevnejša kot v hrbteničnem omrežju. Delo opredeli hierarhijo omrežja (jedro, hrbtenica, dostop, kampus) in temeljne QoS metrike (zakasnitev, jitter, izguba paketov, prepustnost). Primerjava orodij (Ping, MTR, Speedtest-cli, perfSONAR) utemelji izbiro iPerf3 zaradi ločenega TCP/UDP merjenja in podpore vzporednim tokovom. Praktični del predstavlja avtomatiziran sistem: iPerf3 v GuestShell na usmerjevalnikih Cisco C1161, orkestracija prek Ansible (SCP prenos binarne datoteke, priprava strežnika, trije testni načini - normalni, obratni, dvosmerni). Meritve so pokazale asimetrijo med smermi, pripisano procesorski omejitvi pri TCP pošiljanju, s predlaganimi izboljšavami (vzporedni tokovi, nastavitve jedra). Rezultat je osnova za hitro in avtomatizirano merjenje kakovosti storitev na robu omrežja ARNES brez dodatne strežniške infrastrukture na lokaciji.

• Language: Slovenian
• Keywords: QoS, ARNES, dostopovno omrežje, iPerf3, Ansible, avtomatizacija meritev, Cisco GuestShell, TCP/UDP, zakasnitev, izguba paketov, prepustnost
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2026
• PID: 20.500.12556/RUL-185618
• COBISS.SI-ID: 288052739
• Publication date in RUL: 13.08.2026

Secondary language

• Language: English
• Title: Detecting transmission parameter deviations in the ARNES academic network using a throughput measurement tool

Abstract

This thesis addresses quality of service measurement in the ARNES access network, where diagnostics are more demanding than in the backbone due to the involvement of third-party providers. The work defines the network hierarchy (core, backbone, access, campus) and fundamental QoS metrics (latency, jitter, packet loss, throughput). A comparison of tools (Ping, MTR, Speedtest-cli, perfSONAR) justifies the choice of iPerf3 due to separate TCP/UDP measurement and support for parallel streams. The practical part presents an automated system: iPerf3 running in GuestShell on Cisco C1161 routers, orchestrated via Ansible (SCP transfer of the binary, server-side setup, three test modes - normal, reverse, bidirectional). Measurements showed asymmetry between directions, attributed to CPU limitations during TCP transmission, with proposed improvements (parallel streams, kernel parameter tuning). The result is a foundation for fast, automated quality of service measurement at the edge of the ARNES network without additional server infrastructure at each location.

• Keywords: QoS, ARNES, access network, iPerf3, Ansible, measurement automation, Cisco GuestShell, TCP/UDP, latency, packet loss, throughput