Hi,
I am using HP compaq 8510p laptop and i have installed RHEL5.4 32bit.
And my kernel version is 2.6.18-164.el5PAE..But i can't get my  wlan0 up.

When i ifup wlan it shows error 
#ifup wlan0
Error for wireless request "Set Encode" (8B2A) :
    SET failed on device wlan0 ; Invalid argument.
Determining IP information for wlan0........

And finally it fails.

Please check the error from  /var/log/messages
Mar 29 13:30:22 localhost dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 
port 67 interval 13
Mar 29 13:30:24 localhost kernel: iwl4965: Microcode SW error detected.  
Restarting 0x2000000.
Mar 29 13:30:24 localhost kernel: Registered led device: iwl-phy0:radio
Mar 29 13:30:24 localhost kernel: Registered led device: iwl-phy0:assoc
Mar 29 13:30:24 localhost kernel: Registered led device: iwl-phy0:RX
Mar 29 13:30:24 localhost kernel: Registered led device: iwl-phy0:TX
Mar 29 13:30:35 localhost dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 
port 67 interval 20
Mar 29 13:30:55 localhost dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 
port 67 interval 14
Mar 29 13:31:09 localhost dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 
port 67 interval 4
Mar 29 13:31:13 localhost dhclient: No DHCPOFFERS received.
Mar 29 13:33:15 localhost dhclient: wmaster0: unknown hardware address type 801
Mar 29 13:33:15 localhost dhclient: wmaster0: unknown hardware address type 801
Mar 29 13:33:15 localhost dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 
port 67 interval 7
Mar 29 13:33:15 localhost kernel: iwl4965: Error sending REPLY_SCAN_CMD: time 
out after 500ms.
Mar 29 13:33:15 localhost kernel: iwl4965: TX Power requested while scanning!
Mar 29 13:33:22 localhost dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 
port 67 interval 19
Mar 29 13:33:26 localhost kernel: iwl4965: Microcode SW error detected.  
Restarting 0x2000000.
Mar 29 13:33:27 localhost kernel: Registered led device: iwl-phy0:radio
Mar 29 13:33:27 localhost kernel: Registered led device: iwl-phy0:assoc
Mar 29 13:33:27 localhost kernel: Registered led device: iwl-phy0:RX
Mar 29 13:33:27 localhost kernel: Registered led device: iwl-phy0:TX
Mar 29 13:33:27 localhost kernel: iwl4965: Error sending REPLY_SCAN_CMD: time 
out after 500ms.
Mar 29 13:33:27 localhost kernel: iwl4965: TX Power requested while scanning!
Mar 29 13:33:41 localhost dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 
port 67 interval 8
Mar 29 13:33:49 localhost dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 
port 67 interval 10
Mar 29 13:33:59 localhost dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 
port 67 interval 14
Mar 29 13:34:13 localhost dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 
port 67 interval 3
Mar 29 13:34:16 localhost dhclient: No DHCPOFFERS received.
 
And my ifcfg-wlan0 file
# Intel Corporation PRO/Wireless 4965 AG or AGN [Kedron] Network Connection
DEVICE=wlan0
BOOTPROTO=dhcp
ONBOOT=no
HWADDR=00:21:5c:63:d5:f1
NETMASK=
DHCP_HOSTNAME=
IPADDR=
BONDING_OPTS=
DOMAIN=
MASTER=
TYPE=Wireless
USERCTL=yes
IPV6INIT=no
PEERDNS=yes
ESSID=myid
CHANNEL=
MODE=Managed
SECURITYMODE=on
RATE=auto


Please do the needful

Thanks &Regards
Andrew
~                        



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