I'm noticing an IPv6 problem over WiFi. My home LAN has a Tunnelbroker IPv6 prefix. The router broadcasts a Route Avertisement (RA) packet every 30 seconds. All the other v6 enabled devices on my LAN are picking it up, including other Android devices on 9 and 10.
This device, OP5T (dumpling) on 18.1 picks up the advertisement and an IPv6 address when it connects to the WiFi, but then drops it after about 30 seconds. This used to work under 17.1, but it seems to have stopped since I upgraded.
Of course, my LTE network interface is picking up its IPv6 assignment and holding it, so its not platform-wide. That other Androids are also working has me thinking its the new wifi stack on the 5t.
Any suggestions on where to look next?
edit to add: I just noticed the WiFi advanced screen refreshes real time, and that the IPv6 addresses are appearing for 30 seconds, disappearing for 10 seconds, and then reappearing. I looke at the firewall rules for IPv6 and I see some odd terms that seem to drop packets talking to the prefix picked up thru RA. Is this intended?
I thought the reason of my IPv6-problems has to be somewhere in my complex setup (multi-WAN), but after reading your post I may recheck it - maybe it's a problem of the OnePlus 5, not of my setup.
IPv6 works on my PCs, but only for a while on my OnePlus 5. Longer than 30s, but shorter than a day. I do check it by going to www.ipv6-test.com. After a while IPv6 addresses are still shown in my Wifi-settings but ipv6-test and all IPv6-traffic is not working anymore. Reconnecting to the wifi network doesn't change anything, only a reboot helps. But this existed in LOS 17.1, too, not only 18.1.
I can't check IPv6 via LTE, my network provider doesn't offer IPv6 over LTE