IPB198: IPv6 Privacy and Temporary Addresses

This episode of The Everything Feed's IPv6 Buzz dives into the critical yet often misunderstood topic of IPv6 privacy and temporary addresses. Hosts Ed Horley, Nick Baraglio, and Tom Coffeen explore how client devices generate IPv6 addresses, focusing on the trade-offs between privacy, predictability, and network performance. They explain the difference between permanent privacy addresses—randomly generated but stable for DNS and internal network services—and temporary privacy addresses, which are periodically rotated to hinder tracking. The discussion highlights that these features are client-side, not network-controlled, and vary across operating systems like Windows, macOS, and Linux. The hosts also address operational challenges, such as resource exhaustion on access switches due to multiple addresses per device, and emphasize that while privacy extensions don't eliminate tracking entirely, they add a layer of obscurity. They conclude with practical advice: avoid EUI-64 for client devices in favor of DHCPv6 or privacy-based address assignment to reduce exposure of hardware identifiers.