Shameless plug: I wrote a DDNS service in Go [0] that uses Netlink on Linux and the IP Helper API on Windows to monitor network interface addresses in the most efficient way possible. As a result of working on this project, I sent 3 separate CLs to the x/sys module.

[0] https://github.com/database64128/ddns-go

[1] https://go-review.googlesource.com/c/sys/+/597915

[2] https://go-review.googlesource.com/c/sys/+/598895

[3] https://go-review.googlesource.com/c/sys/+/603755