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Re:





>>2) ESP is Encapsulation Security Payload : It provides optional
>>Authentication as well as optional Encryption. One of the service MUST be
>>selected. It provides these services Upper layer protocols & not IP layer.
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>
>Could you explain detail?
>"It provides these services Upper layer protocols & not IP layer."
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It means Encryption is applied to TCP/UDP or may be other Upper layer
protocols & there headers and data are in encrypted form.But , IP header &
it's data is still in cleartext form.So, anyone can view IP header & it's
data.

Same , Authentication mechanism is applied to TCP/UDP or other Upper layer
protocols & not to IP header.So, someone can change IP header & data.

Reg
Rupesh



>
>
>
>>-----Original Message-----
>>From: neha dharia <dharianeha@hotmail.com>
>>To: <ipsec@lists.tislabs.com>
>>Date: Monday, March 27, 2000 11:04 PM
>>
>>
>>>What's the diffrenc between AH and ESP Protocols?
>>>
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>>
>>
>>