Am 2019-12-05 04:36, schrieb Tony Chuang:
>> Subject: RTL8822CE IPv6 autoconfiguration not working
>> 
>> Hello,
>> 
>> I just bought a new laptop with an Realtek RTL8822CE wireless card
>> buildin. I'm using NetworkManager with its internal DHCP client. I 
>> have
>> working IPv6 autoconfiguration support in my home network with 7 
>> devices
>> with different operating systems. When I plug a USB network card into
>> the laptop IPv6 is configured sucessfully. But with the wireless card
>> IPv6 autoconfiguration doesn't work. When I manually add an IPv6 with
>> "sudo ip -6 addr add <address>/64 dev wlp1s0" I can ping IPv6 targets.
>> So there seems to be an bug either in the driver or maybe in
>> NetworkManager which prevents autoconfiguration from working, can
>> sombody look into this? I'm glad to help and provide further
>> informations or test things out.
>> 
>> Kind Regards
>> Joshua
>> 
>> 
>> ip addr
>> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state
>> UNKNOWN
>> group default qlen 1000
>>      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>>      inet 127.0.0.1/8 scope host lo
>>         valid_lft forever preferred_lft forever
>>      inet6 ::1/128 scope host
>>         valid_lft forever preferred_lft forever
>> 2: wlp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq
>> state UP
>> group default qlen 1000
>>      link/ether 40:5b:d8:1a:7a:a9 brd ff:ff:ff:ff:ff:ff
>>      inet 192.168.178.25/24 brd 192.168.178.255 scope global dynamic
>> noprefixroute wlp1s0
>>         valid_lft 863798sec preferred_lft 863798sec
>>      inet6 fe80::1b8b:8c3a:b569:a882/64 scope link noprefixroute
>>         valid_lft forever preferred_lft forever
>> 
>> lspci -v
>> 01:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device 
>> c822
>> 	Subsystem: Electronics & Telecommunications RSH Device 1e25
>> 	Flags: bus master, fast devsel, latency 0, IRQ 71
>> 	I/O ports at 2000 [size=256]
>> 	Memory at c0700000 (64-bit, non-prefetchable) [size=64K]
>> 	Capabilities: <access denied>
>> 	Kernel driver in use: rtw_pci
>> 	Kernel modules: rtwpci
>> 
> 
> I am not sure if this is driver-related problem, but I think you can 
> try to
> tcpdump and see where the autoconfiguration failed.
> And I am not an expert of IPv6, but if there is any issue with the 
> driver I
> can help you.
> 
> Yan-Hsuan

I just plugged in another Wifi card by USB with Ralink chipset. For this 
device wlp3s0f3u3 IPv6 autoconfiguration works successfull while the 
RTL8822CE wlp1s0 still fails. So for me this has to be driver related 
somehow. I catched a NetworkManager debug log, maybe this helps tracking 
the issue down.