"Masataka" == Masataka Ohta
<mohta(_at_)necom830(_dot_)hpcl(_dot_)titech(_dot_)ac(_dot_)jp> writes:
Masataka> My context is IPsec in the Internet, which excludes VPNs.
Masataka> Do you know some major application over the Internet using
Masataka> IPsec with transport mode?
Why the restriction of *over*?
Dozens of IETF specifications are not used *over* the Internet, but only
over IP. Recall that the IETF is about standardizing things over IP,
the internet is only a (large) subset of that.
iSCSI specifies IPsec in transport mode.
L2TP specifies IPsec in transport mode (but, that's remote-access, which
usually means VPNs, so you want exclude that).
So you are right: IPsec in transport mode is rarely used by popular
protocols. But, it is out there, often being used to secure
applications that are one-offs, or whose use is not well known.
That was the point of IPsec: It's a layer of security for people to use
rather than invent their own.
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