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Old 07-04-2013, 05:01 PM   #1
NotionCommotion
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Setting up WiFi on Centos using CLI


Hi, I installed CentOS basic server, and would like to access it via WiFi. The steps I've taken so for are listed below. Looks like the drives are fine. Being basic server, I don't have X, and need to do it via the command line interface (or Webmin if easier). Can anyone help me fill in the gaps? Thank you

Code:
[root@desktop ~]# system-config-network
[root@desktop ~]# ifconfig
eth0      Link encap:Ethernet  HWaddr 88:51:FB:51:DF:70
          inet addr:192.168.0.100  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::8a51:fbff:fe51:df70/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:16589 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4028 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1852429 (1.7 MiB)  TX bytes:1624442 (1.5 MiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

wlan0     Link encap:Ethernet  HWaddr B8:76:3F:69:31:95
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

[root@desktop ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
IPV6INIT=yes
IPV6_AUTOCONF="yes"
NM_CONTROLLED=yes
ONBOOT=yes
TYPE=Ethernet
UUID="05b28da3-5efd-4dff-bdf1-e1aeb842fe65"
HWADDR=88:51:fb:51:df:70
IPADDR=192.168.0.100
PREFIX=24
GATEWAY=192.168.0.1
DNS1=8.8.8.8
DOMAIN=8.8.4.4
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME="System eth0"
LAST_CONNECT=1372676618
USERCTL=no
NETMASK=255.255.255.0
DNS2=8.8.4.4

[root@desktop network-scripts]# cat /etc/sysconfig/network-scripts/ifcfg-wan0
GATEWAY=192.168.0.1
IPV6INIT=no
DNS2=8.8.4.4
BROADCAST=192.168.0.255
USERCTL=no
DNS1=8.8.8.8
BOOTPROTO=none
NAME=""
MACADDR=""
TYPE=Ethernet
DEVICE=wan0
NETMASK=255.255.255.0
MTU=""
IPADDR=192.168.0.101
NETWORK=192.168.0.0
ONBOOT=no

[root@desktop network-scripts]# iwconfig
lo        no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:off/any
          Mode:Managed  Access Point: Not-Associated   Tx-Power=27 dBm
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off

eth0      no wireless extensions.

[root@desktop network-scripts]# iwlist wlan0 scan | grep ESSID
                    ESSID:"William Giles's Guest Network"
                    ESSID:"Wired"
                    ESSID:"William Giles's Network"

[root@desktop network-scripts]# wpa_passphrase Wired "ghghghgh" >> /etc/wpa_supplicant/wpa_supplicant.conf

[root@desktop network-scripts]# cat /etc/wpa_supplicant/wpa_supplicant.conf
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel
network={
        ssid="Wired"
        #psk="ghghghgh"
        psk=3d58fdde2221c7d02eirjf97f67a809f741gjudd20c1df8a5ac8ac2dc74d06a4
}


[root@desktop ~]# ifconfig wlan0 up

[root@desktop ~]# service network restart
Shutting down interface eth0:  Device state: 3 (disconnected)
                                                           [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface eth0:  Active connection state: activating
Active connection path: /org/freedesktop/NetworkManager/ActiveConnection/19
state: activated
Connection activated
                                                           [  OK  ]
[root@desktop ~]#
 
Old 07-04-2013, 07:24 PM   #2
gdizzle
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Hi In regards to your setup things you might need to check:

This is probably a typeo:
Code:
cat /etc/sysconfig/network-scripts/ifcfg-wan0 =  cat /etc/sysconfig/network-scripts/ifcfg-wlan0

here is my wpa_supplicant setup

Code:
vim /etc/wpa_supplicant/wpa_supplicant.conf

network={
  ssid="Test"
  scan_ssid=1
  key_mgmt=WPA-PSK
  psk=a11992c61ebbe4b78bfd3d48b2e18ad1f220db5e86786855639c92e5ea201d815
}
Test you get a basic setup with and use the below to debug your connection:

Code:
wpa_supplicant -c /etc/wpa_supplicant/wpa_supplicant.conf -iwlan0 -dd

Disable NetworkManager, as this causes issues with multiple interfaces speaking on the system.

Enable routing on your host:

Code:
vim /etc/sysctl.conf

net.ipv4.ip_forward = 1

sysctl -p
Also you will need to setup iptables to on the wlan0 interface for routing, you can either user SNAT for a static interface address or Masquerade if you want to set it up via dynamic on the wlan0

Code:
iptables -t nat -I POSTROUTING 1 -o wlan0 -j MASQUERADE
OR
Code:
iptables -t nat -I POSTROUTING 1 -o wlan0 -j SNAT --to-source 192.168.0.101
 
Old 07-04-2013, 07:31 PM   #3
markotitel
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Do you need to access that server via wlan, or you want that server to connect to some access point via wlan?
 
Old 07-04-2013, 08:17 PM   #4
schneidz
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these commands are to help us to know what your system thinks is installed (not necessarily to get you connected).
Code:
lspci # will tell us the pci devices you have in your system.
lsusb # will tell us the usb devices you have in your system.
ifconfig # will tell us what network interface cards you have turned on in your system.
ifconfig -a # will tell us all the network interface cards you have in your system.
iwconfig # will tell us which of your network interface cards has wireless capability
now that we know that, this should get you connected:
Code:
sudo iwlist device scan # this will use the device interface (that from the above command, we found out has wireless capability) and scan for wireless routers that are accessible.
sudo iwconfig device essid "myssid" # assuming no security, use that device to connect to your router.
sudo dhclient # will attempt to get ip-address, subnet mask, dns server information automatically from your router assuming dhcp is turned on on your router.
 
Old 07-04-2013, 09:27 PM   #5
NotionCommotion
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Thanks all!

gdizzle, please elaborate on what you meant by "This is probably a typeo:". Also, great point about iptables as I totally forgot about firewalls.

markotitel, I wish to have a server in my house which I can access from other computers on my LAN or remotely as I will have my router configured to point to its IP for several ports.

schneidz, ifconfig and ifconfig -a do the same thing, no? ifconfig and iwconfig results were posted on my original post, and lspci and lsusb results are posted below. What should I use for "device", and what changes are needed if I am using WPA2?

Thanks!

Code:
[root@desktop ~]# lspci
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5)
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b5)
00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation H61 Express Chipset Family LPC Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
02:00.0 USB controller: Texas Instruments TUSB73x0 SuperSpeed USB 3.0 xHCI Host Controller (rev 02)
03:00.0 Network controller: Ralink corp. Device 539b
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 07)
[root@desktop ~]# lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 003: ID 04f2:1060 Chicony Electronics Co., Ltd
Bus 001 Device 036: ID 0461:4d0f Primax Electronics, Ltd HP Optical Mouse
Bus 002 Device 003: ID 058f:6362 Alcor Micro Corp. Flash Card Reader/Writer
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
[root@desktop ~]#
 
Old 07-05-2013, 10:49 AM   #6
NotionCommotion
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Quote:
gdizzle, please elaborate on what you meant by "This is probably a typeo:".
Oh, wan0 versus wlan0. Got it. Doesn't make a difference, I think, just what I set it up as. I've since, however, changed it to wlan0 just so no future confusion.



Quote:
schneidz, ...What should I use for "device", and what changes are needed if I am using WPA2?
Humm, oh yea, wan0 (or now wlan0 that I changed it). Still struggling on WPA2 part.



Also, gdizzle, you provided the following recommendations. What am I looking for?
Quote:
Test you get a basic setup with and use the below to debug your connection:

Code:

wpa_supplicant -c /etc/wpa_supplicant/wpa_supplicant.conf -iwlan0 -dd
 
Old 07-05-2013, 11:26 AM   #7
NotionCommotion
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Ok, I am close...

gdizzle, you recommended "Disable Disable NetworkManager, as this causes issues with multiple interfaces speaking on the system." I agree, it messes with my ability to start wpa_supplicant. Does NetworkManager do anything I will later need, or am I good just getting rid of it.

Also, I can't ping my router from my wireless box, but I can ping my wireless box from other computers on the LAN. iptables is currently down. Any thoughts?

Thanks
 
Old 07-05-2013, 01:07 PM   #8
schneidz
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Quote:
Originally Posted by NotionCommotion View Post
...
schneidz, ifconfig and ifconfig -a do the same thing, no? ifconfig and iwconfig results were posted on my original post, and lspci and lsusb results are posted below. What should I use for "device", and what changes are needed if I am using WPA2?...
Quote:
Originally Posted by schneidz View Post
Code:
...
ifconfig # will tell us what network interface cards you have turned on in your system.
ifconfig -a # will tell us all the network interface cards you have in your system.
...
i dont use wifi security so i dont know about wpa2 but i found this on a website called google:
google(iwconfig wpa2)[1] = http://www.pantz.org/software/wpa_su...2andlinux.html

please show us the output of
Code:
sudo iwlist wlan0 scan

Last edited by schneidz; 07-05-2013 at 01:17 PM.
 
Old 07-05-2013, 01:50 PM   #9
NotionCommotion
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Thank you schneidz, I don't think I have a problem with WPA2 or the wireless part anymore, but attached iwlistwlan0 scan per your request. I think it has something to do with my server having two interfaces on the same subnet, but am not really sure. Any suggestions would be great. Thanks

[root@desktop ~]# iwlist wlan0 scan
wlan0 Scan completed :
Cell 01 - Address: 20:C90:A1:BE:76
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=35/70 Signal level=-75 dBm
Encryption keyn
ESSID:"William Giles's Network"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=00000f0b29d3fa09
Extra: Last beacon: 907ms ago
IE: Unknown: 001757696C6C69616D2047696C65732773204E6574776F726B
IE: Unknown: 010882848B960C121824
IE: Unknown: 030101
IE: Unknown: 0706555320010B1E
IE: Unknown: 2A0100
IE: Unknown: 32043048606C
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
IE: Unknown: 2D1AAD511BFFFF000000000000000000000000000000000000000000
IE: Unknown: 3D1601001300000000000000000000000000000000000000
IE: Unknown: DD180050F2020101020003A4000027A4000042435E0062322F00
IE: Unknown: DD0700039301730320
IE: Unknown: DD0E0017F2070001010620C9D0A1BE76
IE: Unknown: DD0B0017F20100010100000007
Cell 02 - Address: 00:18:E7:F0:85:CE
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=65/70 Signal level=-45 dBm
Encryption keyn
ESSID:"Wired"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=00000000328aaafa
Extra: Last beacon: 33ms ago
IE: Unknown: 00055769726564
IE: Unknown: 010882848B960C121824
IE: Unknown: 030106
IE: Unknown: 0706555349010B1B
IE: Unknown: 200100
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: Unknown: 2A0100
IE: Unknown: 32043048606C
IE: Unknown: DD180050F2020101030003A4000027A4000042435E0062322F00
IE: Unknown: DD1E00904C334C101BFFFF000000000000000000000000000000000000000000
IE: Unknown: 2D1A4C101BFFFF000000000000000000000000000000000000000000
IE: Unknown: DD1A00904C3406001B00000000000000000000000000000000000000
IE: Unknown: 3D1606001B00000000000000000000000000000000000000
IE: Unknown: DD0900037F01010000FF7F
IE: Unknown: DD770050F204104A0001101044000102103B00010310470010000000000000100000000018E7F085CE10210006442D4C696E 6B1023000D442D4C696E6B20526F75746572102400074449522D383235104200046E6F6E651054000800060050F204000110 1100074449522D383235100800020084103C000103
Cell 03 - Address: 22:C90:A1:BE:76
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=35/70 Signal level=-75 dBm
Encryption keyn
ESSID:"William Giles's Guest Network"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=32000f0b29d403bd
Extra: Last beacon: 904ms ago
IE: Unknown: 001D57696C6C69616D2047696C65732773204775657374204E6574776F726B
IE: Unknown: 010882848B960C121824
IE: Unknown: 030101
IE: Unknown: 0706555320010B1E
IE: Unknown: 2A0100
IE: Unknown: 32043048606C
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
IE: Unknown: 2D1AAD511BFFFF000000000000000000000000000000000000000000
IE: Unknown: 3D1601001300000000000000000000000000000000000000
IE: Unknown: DD180050F2020101020003A4000027A4000042435E0062322F00
IE: Unknown: DD0700039301730208
IE: Unknown: DD0E0017F2070001010620C9D0A1BE76

[root@desktop ~]#
 
Old 07-05-2013, 04:37 PM   #10
schneidz
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the command to associate with your router is only one of these commands -- not all three (only you know which one you want to connect to):
Code:
sudo iwconfig wlan0 essid "William Giles's Network"
sudo iwconfig wlan0 essid "Wired"
sudo iwconfig wlan0 essid "William Giles's Guest Network"
*the "'" mite be causing problems.

what is your pass-phrase for your router ?

Last edited by schneidz; 07-05-2013 at 04:38 PM.
 
Old 07-05-2013, 05:12 PM   #11
NotionCommotion
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Do you mean this?
Quote:
network={
ssid="Wired"
#psk="ghghghgh"
psk=3d58fdde2221c7d02eirjf97f67a809f741gjudd20c1df8a5ac8ac2dc74d06a4
}
 
Old 07-06-2013, 12:33 AM   #12
schneidz
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Try running this:
Code:
sudo wpa_supplicant -B -Dwext -iwlan0 -c/etc/wpa_supplicant/wpa_supplicant.conf
sudo dhclient wlan0
 
Old 07-06-2013, 07:51 AM   #13
NotionCommotion
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Hi schneidz, This error cropped up a bit ago. Ever see it? dhclient never returned anything. Thanks

Code:
[root@desktop ~]# sudo wpa_supplicant -B -Dwext -iwlan0 -c/etc/wpa_supplicant/wpa_supplicant.conf
ctrl_iface exists and seems to be in use - cannot override it
Delete '/var/run/wpa_supplicant/wlan0' manually if it is not used anymore
Failed to initialize control interface '/var/run/wpa_supplicant'.
You may have another wpa_supplicant process already running or the file was
left by an unclean termination of wpa_supplicant in which case you will need
to manually remove this file before starting wpa_supplicant again.

[root@desktop ~]# rm /var/run/wpa_supplicant/wlan0
rm: remove socket `/var/run/wpa_supplicant/wlan0'? y
[root@desktop ~]# sudo wpa_supplicant -B -Dwext -iwlan0 -c/etc/wpa_supplicant/wpa_supplicant.conf
[root@desktop ~]# sudo dhclient wlan0
[root@desktop ~]#

Last edited by NotionCommotion; 07-06-2013 at 07:58 AM.
 
Old 07-06-2013, 09:31 AM   #14
schneidz
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Sorry, never seen it before (never used wpa_supplicant). What does this produce:
Code:
ifconfig
iwconfig

Last edited by schneidz; 07-06-2013 at 09:37 AM.
 
Old 07-07-2013, 12:09 PM   #15
NotionCommotion
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Hi schneidz,

I actually got things working. Not sure really what I changed, but that error went away. I think the problem related to trying to get flan0 working when eth0 was connected.

I then need to type the following at the command prompt (note I don't have -Dwext, but it might also work):
Code:
wpa_supplicant -B -iwlan0 -c/etc/wpa_supplicant/wpa_supplicant.conf
dhclient wlan0
I also implemented http://wiki.centos.org/HowTos/Laptops/WpaSupplicant. Why do you think I need to do wpa_supplicant... at the command prompt, and what can I do to make it automatically occur at boot?

EDIT: -Dwext doesn't cause any problems, and dhclient wlan0 isn't even required.

Thanks

Last edited by NotionCommotion; 07-07-2013 at 12:15 PM.
 
  


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