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# iwconfig
eth1 IEEE 802.11b/g ESSID:""
Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated
Bit Rate:0 kb/s Tx-Power=18 dBm
Retry short limit:8 RTS thr=2347 B Fragment thr=2346 B
Encryption key:off
Power Management:off
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
Next, you will set up the interface
# ifconfig eth1 up
eth1 Link encap:Ethernet HWaddr 00:13:E0:C3:0C:3C
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)
and you can scan for an AP
# iwlist eth1 scan
Cell 04 - Address: 00:18:84:81:46:E2
ESSID:"MyPlace"
Mode:Managed
Frequency:2.427 GHz (Channel 4)
Quality=100/100 Signal level=-39 dBm Noise level=-96 dBm
Encryption key:off
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
48 Mb/s; 54 Mb/s
Now, is time to associate to your AP
# iwconfig eth1 txpower auto essid MyPlace channel 4
eth1 IEEE 802.11b/g ESSID:"MyPlace"
Mode:Managed Frequency:2.427 GHz Access Point: 00:18:84:81:46:E2
Bit Rate:0 kb/s Tx-Power=13 dBm
Retry short limit:8 RTS thr=2347 B Fragment thr=2346 B
Encryption key:off
Power Management:off
Link Quality=97/100 Signal level=-43 dBm Noise level=-94 dBm
Rx invalid nwid:0 Rx invalid crypt:3109 Rx invalid frag:0
Tx excessive retries:13 Invalid misc:3315 Missed beacon:0
and get and ip address
# udhcpc -i eth1
udhcpc (v1.9.1) started
Sending discover...
Sending select for 192.168.10.216...
Lease of 192.168.10.216 obtained, lease time 43200
adding dns 192.168.10.1
manual config
ifconfig wlan0 192.168.1.100 netmask 255.255.255.0
route add defaulte gw 192.168.1.1
Last, you can test the network interface.
# ping -c 1 192.168.10.1
PING 192.168.10.1 (192.168.10.1): 56 data bytes
64 bytes from 192.168.10.1: seq=0 ttl=64 time=16.327 ms
--- 192.168.10.1 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 16.327/16.327/16.327 ms
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