You could use Tunnel mode with Encapsulating Security Payload (ESP).  You
will have a new IP and ESP header applied to the front of the packet.  Only
the original IP payload would be encrypted, and authentication would only be
applied up to the new ESP header.  This would not affect your MPLS shim
header.

Stefan Fouant
On Mon, Apr 7, 2008 at 7:08 AM, mohd hgh <[EMAIL PROTECTED]> wrote:

> Hi
>
> Is there are a way to encrypt the body of the IP
> Packet only without encrypt the header of IP Packet in
> ISG1000, since i want to apply the MPLS QoS over
> encryption data.
>
> Thanks
>
>
>
>  
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