Weird IPv6/Safari problem on Sonoma 14.1and 14.1.1

[donawalt]

This is a question for you network gurus....for reasons of instability on my network (story for another day), I have had IPv6 disabled on my network for months. However, today I saw something very strange! I happened to be working on 1 of 2 MacBook Pro laptops here, and lo and behold it shows IPv6 working on WiFi, and passing the online IPv6 tests!

This confused me. I checked another MacBook Pro, a Windows laptop, an iPad, and an iPhone, all report IPv6 unavailable. I logged into the Netgear RBR850 router, and confirmed that IPv6 is disabled. So I ended up trying:

-by luck the MacOS minor update was available and performed; to version 14.1.1, with restart;

-tried on both Safari and Chrome -- Chrome shows IPv6 correctly disabled, Safari shows IPv6 working perfectly!

-cleared all website data in Settings on Safari.

-did "Empty Cache" on the Developer menu on Safari.

- tested IPv6 on 4 different internet sites to confirm all say IPv6 is working perfectly.


none of this helped.

So I guess this is a Safari problem, how is this happening and how can I fix it?

 

[planetf1]

Using iCloud private relay? That likely gives you an ipv6 connection over IPv4.

Personally I find ipv6 useful and it works perfectly

 

[donawalt]

No I don't use iCloud private relay. IPv6 was very solid until the latest firmware update to the Netgear Orbi 850 series router - it runs great then 4-6 hours later the router thinks it has an IPv6 address but any of about 4 internet tests fail IPv6. Plus, network performance goes into the tank. So I have to have it disabled on the router. I was even part of the beta test and sent them a ton of debug files and other test results, but no fix yet.