Istvan_Rabai Thu, 05/01/2008 - 06:21
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Hi,


GRE adds another layer3 to the existing layer3 packet.


IPSec transport mode adds a layer that sits between layer3 and layer4, to encrypt data within the layer4 PDU.


IPSec tunnel mode encapsulates existing layer3 packet in a new layer for encryption, then adds a new layer3.


So generally speaking, IPSec and GRE are said to be layer3 protocols.


Cheers:

Istvan

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