wireless network

[bboruku]

I just installed centos 7 on dell inspiron 5420. the wired network is working but the wireless device not enabled at all. the bluetooth is working.
any help?

[TrevorH]

Does it show up in the output of ifconfig -a or ip link show if ifconfig is not installed.

[bboruku]

it does not show at all.
see what it showed below

[root@localhost opt]# ifconfig -a
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 0 (Local Loopback)
RX packets 78 bytes 7113 (6.9 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 78 bytes 7113 (6.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

p4p1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.3 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::5ef9:ddff:fe3f:b87e prefixlen 64 scopeid 0x20<link>
ether 5c:f9:dd:3f:b8:7e 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 16

virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:64:65:72 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 6 bytes 707 (707.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

virbr0-nic: flags=4098<BROADCAST,MULTICAST> mtu 1500
ether 52:54:00:64:65:72 txqueuelen 500 (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

[TrevorH]

Right, so when it doesn't show up like that, it means there is no driver for it. Take the output of lspci -nn | grep -i net and go to ELRepo and look up the PCI vendor and device id there and see if they provide a kmod package for that chipset. If they do, download it, transfer it to the machine in question and use yum install /path/to/downloaded.rpm to install it. Once it's installed then the interface should show up in ifconfig and be configurable in the normal way.