Hi Jari,
Hi Lakshminath,
I guess there are differences in our understanding of 3G-WLAN
interworking (and I could be wrong), but the point is that
they (plan
to) use EAP over IKEv2. We can try and debate the details
offline, as
that is not central to the discussion here.
There's no question of whether IKEv2/EAP is being used.
3G-WLAN interworking is one example, Unlicensed Mobile Access
is another one, what IKEv2/EAP was originally designed for is
corporate VPN access, etc.
But in most of these cases the usage is really VPN like,
i.e., you already have Internet connectivity but to get to a
closed network or service you contact a gateway via IKEv2.
That gateway is often known beforehand and it could be in the
other side of the world.
Access control to get your Internet connectivity is another
matter. 3G-WLAN, for instance, assumes local mechanisms for
that in addition to whatever VPN to the home network.
The specs don't really say much about what the local
mechanisms are except that they need to be EAP-based if
authentication via the 3G network is desired. But the
assumption is that on a 802.11 network, 802.11i would get used.
I am not sure that the VPN case and the access control in the 3G-WLAN
case are that different. The VPN access you are describing really
provides "remote access control". The point of that is that the edge
equipment is out of control (and potentially untrusted) of the entity
providing access and hence there is a need for remote access control. It
is essentially the same scenario for parts of 3G-WLAN interworking. The
access points may be provided by a vendor that is different from the
operator and hence, an operator's box is performing "remote access
control" using IPsec - the method to set up the IPsec SA was chosen to
be an IKEv2/EAP combination. Of course, in the cases where the WLAN
equipment can be trusted and is part of the operator's network, 802.11i
would potentially be used as you say.
The only difference in the enterprise WLAN vs 3G-WLAN scenario is that
the former is providing intranet access, while the latter is for general
internet access even. However, this is really about semantics. If an
entity actually receives a valid IP address to use in the local network,
it only needs to perform IPsec/IKEv2 with the operator's box in the
3G-WLAN case for access to home domain services (no different really
from the corporate VPN case).
Vidya
This leaves still the question of whether IKEv2/EAP or PANA
could be used to provide access control for the Internet
connectivity. More on that in my other e-mail.
--Jari
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