Abstract

How do VPNs interact with IPv6? Our poster shows that VPNs often leak IPv6 traffic, failing to provide the promised privacy, and VPNs often prefer IPv4, even though IPv6 is available and working. These results use new data from a website for IP identification, coupled with experiments on specific VPN software. We identify the fraction of v6 traffic leaked, and find the root-cause of IPv6 de-preferencing in interactions between address selection in OSes and VPNs

Date

October 28, 2025

Authors

Yejin Cho, John Heidemann

Book

Proceedings of the 2025 ACM Internet Measurement Conference

Pages

1048-1049