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From:   Tony Chuang <yhchuang@realtek.com>
To:     "linux@jusic.net" <linux@jusic.net>,
        "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Subject: RE: RTL8822CE IPv6 autoconfiguration not working
Thread-Topic: RTL8822CE IPv6 autoconfiguration not working
Thread-Index: AQHVqFeWgmjllZPQVk+Ms5UKcM7zDKeq6Qwg
Date:   Thu, 5 Dec 2019 03:36:18 +0000
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> 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