Publication details

Threats and Surprises behind IPv6 Extension Headers

Authors

HENDRIKS Luuk VELAN Petr DE O SCHMIDT Ricardo DE BOER Pieter-Tjerk PRAS Aiko

Year of publication 2017
Type Article in Proceedings
Conference 2017 Network Traffic Measurement and Analysis Conference (TMA)
Citation
Doi http://dx.doi.org/10.23919/TMA.2017.8002912
Keywords Internet;Monitoring;Payloads;Probes;Protocols;Security;Standards
Attached files
Description The concept of Extension Headers, newly introduced with IPv6, is elusive and enables new types of threats in the Internet. Simply dropping all traffic containing any Extension Header — a current practice by operators-seemingly is an effective solution, but at the cost of possibly dropping legitimate traffic as well. To determine whether threats indeed occur, and evaluate the actual nature of the traffic, measurement solutions need to be adapted. By implementing these specific parsing capabilities in flow exporters and performing measurements on two different production networks, we show it is feasible to quantify the metrics directly related to these threats, and thus allow for monitoring and detection. Analysing the traffic that is hidden behind Extension Headers, we find mostly benign traffic that directly affects end-user QoE: simply dropping all traffic containing Extension Headers is thus a bad practice with more consequences than operators might be aware of.

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