#49: full on-demand mobility support
The three proposed flags express a “type” of source IP address an
application wants to get to the IP stack. Particularly, the sustained IP
address is proposed to provide on-demand IP session continuity, which
activates IP mobility once the terminal moves across other access network.
While the terminal stays at the same network where the session is
initiated, regular IP routing is applied.
The on-demand draft does not assure provide the full on-demand mobility
for all scenarios by merely indicating the Socket API,
IPV6_REQ_SUSTAINED_IP. An example scenario raising the aforementioned
issue is as follows;
0. The MN is configured with one or more Nomadic IP addresses.
1. Once an app. requests “sustained IP address” to the IP stack, and it
will obtain a sustained IP address through a protocol procedure between
the terminal and network.
2. Other app. initiated over the same access network will use the same
sustained IP address while the terminal remains connected at the same
access network.
3. The terminal moves to another access network and a new app. requests a
sustained IP address with the Socket API to the IP stack. Since a
sustained IP address is already available in the IP stack, the sustained
IP address is assigned to the new app.
Besides, in case sustained IP address allocation is used default, there
may be multiple sustained IP addresses including newly obtained sustained
IP address over the new access network in the IP stack. However, when an
app. is initiated, the IP stack may not select the new one in the context
of the default source IP address selection mechanism [RFC6724][RFC5014].
For providing the full on-demand mobility, a new flag is needed, letting
the IP stack request a new sustained IP address or choose a sustained IP
address not requiring IP mobility anchoring when an application is
initiated, among the existing ones in the IP stack.
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-------------------------+-------------------------------------------------
Reporter: | Owner: draft-ietf-dmm-ondemand-
seilj...@av.it.pt | mobil...@tools.ietf.org
Type: defect | Status: new
Priority: critical | Milestone:
Component: ondemand- | Version:
mobility | Keywords: on-demand mobility
Severity: Submitted |
WG Document |
-------------------------+-------------------------------------------------
Ticket URL: <http://trac.tools.ietf.org/wg/dmm/trac/ticket/49>
dmm <http://tools.ietf.org/dmm/>
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