Hi Danny,
Le 03/07/2016 à 16:03, Moses, Danny a écrit :
Hi Alex,
From the standard point of view, IPv6 indeed provides two alternatives:
Stateless and Stateful address assignment, and the text in the draft
does not mention this and might even be misleading to assume that the
network always assigns the source IP address – so I agree with your comment.
The reason for that is that this draft is meant for application
developers who need to understand how they can influence the network
behavior through address type request. For them, the exact mechanism of
address assignment is a detail which might be confusing. Our thinking
was, that even in the stateless case the generated source IP address
comprises a network prefix that was assigned by some entity in the
network. So the text is still true for the Stateless case.
If you still think that this is too misleading, I propose the following
change:
1. Remove the text – 'assigned to the mobile host by the network'
in the definition of both the Fixed IP address and Session-lasting IP
address.
2. Add a comment indicating that the IP address may either be
assigned to the mobile host by the network (Stateful address assignment)
or generated by the host using a Prefix that was assigned by the network
(stateless)
As a result, the text in this section will become (new text in red):
Three types of IP addresses are defined with respect to the mobility
management.
- Fixed IP Address
A Fixed IP address is an address assigned to the mobile host by the
network with a guarantee to be valid for a very long time, regardless
of whether it is being used in any packets to/from the mobile host,
or whether or not the mobile host is connected to the network, or
whether it moves from one point-of-attachment to another (with a
different subnet or IP prefix) while it is connected.
Fixed IP address are required by applications that need both IP
session continuity and IP address reachability.
- Session-lasting IP Address
A session-lasting IP address is an address assigned to the mobile
host by the network with a guarantee to be valid through-out the IP
session(s) for which it was requested. It is guaranteed to be valid
even after the mobile host had moved from one point-of-attachment to
another (with a different subnet or IP prefix).
Session-lasting IP addresses are required by applications that need
IP session continuity but do not need IP address reachability.
- Non-persistent IP Address
This type of IP address provides neither IP session continuity nor IP
address reachability. The IP address is obtained from the serving IP
gateway and it is not maintained across gateway changes. In other
words, the IP address may be released and replaced by a new IP address
when the IP gateway changes due to the movement of the mobile host.
Applications running as servers at a published IP address require a
Fixed IP Address. Long-standing applications (e.g., an SSH session)
may also require this type of address. Enterprise applications that
connect to an enterprise network via virtual LAN require a Fixed IP
Address.
Applications with short-lived transient IP sessions can use Session-
lasting IP Addresses. For example: Web browsers.
Applications with very short IP sessions, such as DNS client and
instant messengers, can utilize Non-persistent IP Addresses. Even
though they could very well use a Fixed of Session-lasting IP
Addresses, the transmission latency would be minimized when a Non-
persistent IP Address is used.
The network creates the desired guarantee (Fixed, Session-lasting or
Non-persistent) by either assigning an address (as part of a stateful
address generation), or by assigning the address prefix (as part of a
stateless address generation).
Does this change addresses your concerns?
Yes, this change addresses my concerns.
Alex
Thanks,
/Danny
-----Original Message-----
From: Alexandre Petrescu [mailto:alexandre.petre...@gmail.com]
Sent: Friday, July 01, 2016 09:41
To: jouni.nos...@gmail.com; Seil Jeon
Cc: Moses, Danny; dmm@ietf.org
Subject: Re: [DMM] New version of the OnDemand Mobility draft
My concern is partially addressed, yes.
There is still this text which can be improved:
- Session-lasting IP Address
A session-lasting IP address is an address assigned to the mobile
host by the network [...]
A session-lasting IP address is an address formed in conjunction by the
host and the network (SLAAC), or assigned by the network (DHCP) [...]
A session-lasting IP prefix is a prefix advertised to the mobile host by
the network [...]
Alex
Le 30/06/2016 à 19:05, Jouni Korhonen a écrit :
Seil, Alex,
Have your concerns been addressed in the -06 revision?
- Jouni
6/30/2016, 2:20 AM, Moses, Danny kirjoitti:
Hi,
I have posted a new version of the OnDemand Mobility draft:
_draft-ietf-dmm-ondemand-mobility-06_
<https://datatracker.ietf.org/doc/draft-ietf-dmm-ondemand-mobility/>.
This new version includes some text editing according to the comments
from Seil and change of classification from the Standard track to
Informational.
Please support it (those who have not cast their support yet).
Thanks,
/Danny
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