Am 2019-12-05 09:32, schrieb Kalle Valo:
Tony Chuang <yhchuang@xxxxxxxxxxx> writes:
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.
My first guess would be some kind of multicast problem with power save
mode. I would first try disabling the power save mode on the driver and
see if that helps.
Disable power save with iw:
iw dev wlp1s0 get power_save
Power save: off
or in tlp:
# WiFi power saving mode: on=enable, off=disable; not supported by all
adapters.
# Default: <none>
WIFI_PWR_ON_AC=off
WIFI_PWR_ON_BAT=off
or on NetworkManager:
# File to be place under /etc/NetworkManager/conf.d
[connection]
# Values are 0 (use default), 1 (ignore/don't touch), 2 (disable) or 3
(enable).
wifi.powersave = 2
Did not help, where else could this be configured?
