OSI and IPSEC and Gre

Unanswered Question
May 1st, 2008

Guys which OSI layer IPSEC AND GRE sits in??? which layer they belong to.....

I have this problem too.
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Istvan_Rabai Thu, 05/01/2008 - 06:21

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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