SIDN Labs https://sidnlabs.nl February 5th, 2021 Peer-reviewed Publication Title: Fragmentation, truncation, and timeouts: are large DNS messages falling to bits? Authors: Giovane C. M. Moura, Moritz M¨uller,Marco Davids, Maarten Wullink, Cristian Hesselman Venue: In Proceedings of the 2021 Passive and Active Measurement Conference (PAM2021), Virtual Conference. DOI: TBD Conference dates: Late March 2021 (TBA) Citation: • Giovane C. M. Moura, Moritz M¨uller,Marco Davids, Maarten Wullink, Cristian Hesselman. Fragmentation, truncation, and timeouts: are large DNS messages falling to bits? Proceed- ings of the 2021 Passive and Active Measurement Conference (PAM2021). Virtual Conference, March. 2021 • Bibtex: @inproceedings{Moura21c, author = {Moura, Giovane C. M. and Mueller, Moritz and Davids, Marco and Wullink, Maarten and Hesselman, Cristian}, title = {{ Fragmentation, truncation, and timeouts: are large DNS messages falling to bits?}}, booktitle = {Proceedings of the 2021 Passive and Active Measurement Conference (PAM2021)}, year = {2021}, address = {Virtual Conference}, } 1 Fragmentation, truncation, and timeouts: are large DNS messages falling to bits? Giovane C. M. Moura1, Moritz M¨uller1;2, Marco Davids1, Maarten Wullink1, and Cristian Hesselman1;2 1 SIDN Labs, Arnhem, The Netherlands 2 University of Twente, Enschede, The Netherlands
[email protected] Abstract. The DNS provides one of the core services of the Internet, mapping applications and services to hosts. DNS employs both UDP and TCP as a transport protocol, and currently most DNS queries are sent over UDP. The problem with UDP is that large responses run the risk of not arriving at their destinations { which can ultimately lead to unreach- ability. However, it remains unclear how much of a problem these large DNS responses over UDP are in the wild.