excuse me for bad English 
i execute /sbin/lspci -nnk | grep -i -A2 net command and it say
04:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N 6200 [8086:422c] (rev 35)
Subsystem: Intel Corporation Centrino Advanced-N 6200 2x2 AGN [8086:1321]
--
09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 03)
Subsystem: Dell Device [1028:0413]
Kernel driver in use: r8169
and when execute that command under default kernel say
04:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N 6200 [8086:422c] (rev 35)
Subsystem: Intel Corporation Centrino Advanced-N 6200 2x2 AGN [8086:1321]
Kernel driver in use: iwlagn
--
09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 03)
Subsystem: Dell Device [1028:0413]
Kernel driver in use: r8169
and i download firmware for wifi from intel web site and file name is iwlwifi-6000-ucode-9.221.4.1.tar contain 3 files readme and license and a ucode file
in readme at INSTALLATION part i found this text 
The iwlagn driver will look for the file iwlwifi-6000-4.ucode using the
kernel’s firmware_class infrastructure. More information can be found under
Documentation/firmware_class in kernel source. In order to function
correctly, you need to have this support enabled in your kernel. When
you configure the kernel, you can find this option in the following
location:
Device Drivers ->
Generic Driver Options ->
Userspace firmware loading support
You can determine if your kernel currently has firmware loader support
by looking for the CONFIG_FW_LOADER definition on your kernel’s
.config.
i think i need to compile kernel again 
to continue of that text another way to install is using udev
The steps for installing and configuring udev are very
distribution specific.

please help me to understand about udev installation and using it
You can typically find this location by looking in the
udev scripts of your distro, the default is /lib/firmware.
Installation of the firmware is simply:
% cp iwlwifi-6000-4.ucode /lib/firmware
You can now load the driver (see the INSTALL and README.iwlwifi provided with
the iwlwifi package for information on building and using that driver.)
where can i find “INSTALL and README.iwlwifi provided with
the iwlwifi package for information on building and using that driver” and how to load driver ?
THANKS.