802.11ac wifi adapter seen as WLAN

Issues related to hardware problems
wlfehr
Posts: 10
Joined: 2017/05/31 18:20:48

802.11ac wifi adapter seen as WLAN

Postby wlfehr » 2017/06/07 13:18:00

I am trying to install an 802.11ac Wi-Fi USB adapter to my Dell laptop (with an active internal 802.11 a/b/g/n PCI interface) running CentOS7. I have tried installing two different adapters with different chipsets and drivers that I installed from the vendor. Both drivers installed without errors and both adapters are recognized as USB devices. The NetworkManager shows them as WLAN but treated as wired connections (including the icon for the interface). I cannot do anything with them. I plug in an older 802.11b/g/n USB adapter that has a driver that was part of the distribution and it is instantly categorized as a proper WLAN (along with the internal interface).

[root@TestMachine-PC realtek]# lsusb
Bus 002 Device 006: ID 0a5c:5800 Broadcom Corp. BCM5880 Secure Applications Processor
Bus 002 Device 005: ID 8086:0188 Intel Corp. WiMAX Connection 2400m
Bus 002 Device 004: ID 05fe:0011 Chic Technology Corp. Browser Mouse
Bus 002 Device 003: ID 13b1:003f Linksys WUSB6300 802.11a/b/g/n/ac Wireless Adapter [Realtek RTL8812AU]
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
[root@TestMachine-PC realtek]#

[root@TestMachine-PC realtek]# ifconfig -a
em1: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 00:26:b9:f0:d6:f5 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 20 memory 0xe9600000-e9620000

enp0s29u1u2: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether c8:d7:19:c2:87:93 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Local Loopback)
RX packets 72 bytes 6248 (6.1 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 72 bytes 6248 (6.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

wlp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.81 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 2602:304:cf5c:adb0:1136:6fc0:9a4:b40e prefixlen 64 scopeid 0x0<global>
inet6 fe80::fb33:5df3:68f9:f2b0 prefixlen 64 scopeid 0x20<link>
ether 00:23:15:9a:c1:00 txqueuelen 1000 (Ethernet)
RX packets 4260 bytes 632448 (617.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 795 bytes 136623 (133.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

Is there an extra step to the driver installation process for devices not supported in the distribution? The driver looks like it is in the right place for the Linksys adapter (see the 8812au.ko below.

[root@TestMachine-PC ethernet]# cd /usr/lib/modules/3.10.0-514.el7.x86_64/kernel/drivers/net/wireless
[root@TestMachine-PC wireless]# ls
8812au.ko ath broadcom intel marvell ralink realtek

thanks, Walt

wlfehr
Posts: 10
Joined: 2017/05/31 18:20:48

Re: 802.11ac wifi adapter seen as WLAN

Postby wlfehr » 2017/06/07 16:17:14

Here is another clue:

There is no ifcng script in

[root@TestMachine-PC rtl8812au]# cd /etc/sysconfig/network-scripts
[root@TestMachine-PC network-scripts]# ls
ifcfg-ATT3UtD53G ifdown-ippp ifdown-Team ifup-ib ifup-ppp init.ipv6-global
ifcfg-em1 ifdown-ipv6 ifdown-TeamPort ifup-ippp ifup-routes keys-ATT3UtD53G
ifcfg-lo ifdown-isdn ifdown-tunnel ifup-ipv6 ifup-sit network-functions
ifdown ifdown-post ifup ifup-isdn ifup-Team network-functions-ipv6
ifdown-bnep ifdown-ppp ifup-aliases ifup-plip ifup-TeamPort
ifdown-eth ifdown-routes ifup-bnep ifup-plusb ifup-tunnel
ifdown-ib ifdown-sit ifup-eth ifup-post ifup-wireless

Ironguts25
Posts: 1
Joined: 2018/02/04 00:36:33

Re: 802.11ac wifi adapter seen as WLAN

Postby Ironguts25 » 2018/02/04 01:03:18

I wasted a whole week trying to figure this out in Centos 7.4. I tried different USB wifi adapters and could not get any to work. Compiled driver after driver and still nothing. Spent countless hours researching work-arounds. The adapters would only show as a wired and would not connect. Then I bought a cheap tp-link Wireless N PCI Express card and that worked right out of the box! No configuring at all. Wish I had done that in the first place. My advise, don't bother trying to run a USB wifi adapter under Centos 7.4.