Hello
so i used yum to install kernel and kernel-devel same follow:
[root@localhost ~]# yum install kernel
Loading "installonlyn" plugin
Setting up Install Process
Setting up repositories
Reading repository metadata in from local files
Parsing package install arguments
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Package kernel.i686 0:2.6.19-1.2911.6.5.fc6 set to be installed
--> Running transaction check
--> Populating transaction set with selected packages. Please wait.
---> Package kernel.i686 0:2.6.20-1.2925.fc6 set to be erased
--> Running transaction check

Dependencies Resolved

=============================================================================
Package Arch Version Repository Size
=============================================================================
Installing:
kernel i686 2.6.19-1.2911.6.5.fc6 updates 16 M
Removing:
kernel i686 2.6.20-1.2925.fc6 installed 45 M

Transaction Summary
=============================================================================
Install 1 Package(s)
Update 0 Package(s)
Remove 1 Package(s)

Total download size: 16 M
Is this ok [y/N]: y
Downloading Packages:
(1/1): kernel-2.6.19-1.29 100% |=========================| 16 MB 02:17
Running Transaction Test
Finished Transaction Test


Transaction Check Error: package kernel-2.6.20-1.2925.fc6 (which is newer than kernel-2.6.19-1.2911.6.5.fc6) is already installed
and:
[root@localhost ~]# yum install kernel-devel
Loading "installonlyn" plugin
Setting up Install Process
Setting up repositories
Reading repository metadata in from local files
Parsing package install arguments
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for kernel-devel to pack into transaction set.
kernel-devel-2.6.19-1.291 100% |=========================| 724 kB 00:01
---> Package kernel-devel.i686 0:2.6.19-1.2911.6.5.fc6 set to be installed
--> Running transaction check

Dependencies Resolved

=============================================================================
Package Arch Version Repository Size
=============================================================================
Installing:
kernel-devel i686 2.6.19-1.2911.6.5.fc6 updates 4.7 M

Transaction Summary
=============================================================================
Install 1 Package(s)
Update 0 Package(s)
Remove 0 Package(s)

Total download size: 4.7 M
Is this ok [y/N]: y
Downloading Packages:
(1/1): kernel-devel-2.6.1 100% |=========================| 4.7 MB 00:25
Running Transaction Test
Finished Transaction Test


Transaction Check Error: package kernel-devel-2.6.20-1.2925.fc6 (which is newer than kernel-devel-2.6.19-1.2911.6.5.fc6) is already installedreboot system and :

[root@localhost ~]# uname -r
2.6.18-1.2798.fc6xen
why? it should be 2.6.20-1.2925.fc6
for install ip_wccp i did:
[root@localhost ~]# yum install ip_wccp
Loading "installonlyn" plugin
Setting up Install Process
Setting up repositories
Reading repository metadata in from local files
Parsing package install arguments
No Match for argument: ip_wccp
Nothing to do

also it gets this result for try to install ip_wccp-1.7 or 1.6 module.help me plssssss

Do the following
>su
pwd
>gedit /etc/grub.conf

put # in front of hiddenmenu
and
put default=1 and reboot

This will boot the computer into the latest installed kernel(not the xen one) and show you the boot menu where you can select the kernel to boot into
Hope I have got your question correct

Edit: BTW did you manually download & install kernel before doing yum install kernel? It seems that newer version than what exists in the default repository is installed

thanku,i did what u said,but its kernel is old yet

[root@localhost ~]# gedit /etc/grub.conf
cannot open display:
Run 'gedit --help' to see a full list of available command line options.

[root@localhost ~]# vim /etc/grub.conf


# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
# initrd /initrd-version.img
#boot=/dev/hda
default=1
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
#hiddenmenu
title Fedora Core (2.6.20-1.2925.fc6)
root (hd0,0)
kernel /vmlinuz-2.6.20-1.2925.fc6 ro root=/dev/VolGroup00/LogVol00 rhgb quiet
initrd /initrd-2.6.20-1.2925.fc6.img
title Fedora Core (2.6.18-1.2798.fc6xen)
root (hd0,0)
kernel /xen.gz-2.6.18-1.2798.fc6
module /vmlinuz-2.6.18-1.2798.fc6xen ro root=/dev/VolGroup00/LogVol00 rhgb quiet
module /initrd-2.6.18-1.2798.fc6xen.img
title Fedora Core-up (2.6.18-1.2798.fc6)
root (hd0,0)
kernel /vmlinuz-2.6.18-1.2798.fc6 ro root=/dev/VolGroup00/LogVol00 rhgb quiet
initrd /initrd-2.6.18-1.2798.fc6.img

reboot,

[root@localhost ~]# uname -r
2.6.18-1.2798.fc6xen

put default=0 to boot into 2.6.20-1.2925.fc6 kernel

ok.thanks.it works properly.but now,how should install ip_wccp via yum?
thank u very much dear Sn68

how should install ip_wccp via yum?

ip_wccp does not seem to be available in yum repositories (incl freshrpms & livna)
There is an rpm available at http://rpm.pbone.net (kernel-net-ip_wccp.---.rpm) which you can download and install else you can download the tar file for ip_wccp and install

i couldnt use those rpms :
[root@localhost ~]# rpm -i kernel-net-ip_wccp-0.1-16@2.2.26_3.i386.rpm
error: Failed dependencies:
kernel-up = 2.2.26-3 is needed by kernel-net-ip_wccp-0.1-16@2.2.26_3.i386
this result gets for others trying
help me

The kernel version and the ip_wccp version needs to be the same, if you cant find the ip_wccp version to match your kernel, you can always install kernel(which are more easily available) to match ip_wccp version