IP layer / IPSec

Sandy Harris sandy at STORM.CA
Thu Mar 15 16:08:15 EST 2001


Olivier Bekoin wrote:
>
> "The term IPsec (IP Security Protocol) indicates a protocol of security,
> defined to the IETF, which aims at making safe flows on the level IP."
> (hhtp://www.hsc.fr)
>
> I have a confusion and i ask this question about IP layer (network layer)
> and IPSec.
>
> is it the network layer of OSI model or the network layer of mapage TCP/IP
> in 4 layers of the model with 7 layers OSI?

It is the IP in TCP/IP.
If you need a formal model:
http://www.cis.ohio-state.edu/rfc/rfc0871.txt

The OSI 7-layer stuff is irrelevant here.  To quote the author of the above RFC:
"If you know what you're doing, three layers are enough. If not, even seventeen
won't save you."

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