i got linux box :
Linux mybox.pureserver.info 2.6.11.9-050512a #1 SMP Thu May 12 20:53:02 CEST 2005 i686 i686 i386 GNU/Linux

i use VPN software from :
http://www.it.utah.edu/services/helpDesk/connectedhelp/vpn_faq/linux_faq.html

requirement it need for install VPN is :
The VPN Client for Linux supports Red Hat Version 6.2 Linux (Intel), or compatible libraries with glibc Version 2.1.1-6 or later, using kernel Versions 2.2.12 or later.

when i try to install, it asking me kernel locations ....

[root@p15188516 vpnclient]# ./vpn_install
Cisco Systems VPN Client Version 4.0 (Rel) Linux Installer
Copyright (C) 1998-2001 Cisco Systems, Inc. All Rights Reserved.

By installing this product you agree that you have read the
license.txt file (The VPN Client license) and will comply with
its terms.


Directory where binaries will be installed [/usr/local/bin]

Automatically start the VPN service at boot time [yes]

In order to build the VPN kernel module, you must have the
kernel headers for the version of the kernel you are running.

For RedHat 6.x users these files are installed in /usr/src/linux by default
For RedHat 7.x users these files are installed in /usr/src/linux-2.4 by default
For Suse 7.3 users these files are installed in /usr/src/linux-2.4.10.SuSE by default

Directory containing linux kernel source code []

when i go to /usr/src/ there is empty ... nothing there ??
what it means ?? my box don't have kernel or ??? or i have wrong locations ??

where can i located kernel ......

can i install kernel again ??? where can i get kernel ??

You have a kernel binary obviously, you just do not have the kernel src.
In redhat is most likely on the cd, put your cd in, and do a search for the kernel source.

but i dont have physical access ...
it only dedicated servers that i buy.

another solutions ??? pls