Re: I-D Action: draft-ietf-dmm-requirements-14.txt

Alex,

In the 2 choices to describe the need for mobility support for MR, the second choice involves more changes than the first choice. Because the draft is already going through IESG, I think we can take the first choice as the basis: 

Mobility support is also needed, for example, when a mobile router moves together with a host and an application in the host is interrupted by a change of IP address of the mobile router and the presence of ingress filtering.

Since this mobile router sentence was okay technically except for being too long, I think we can simply shorten it as follows: 

Mobility support is also needed when a mobile router changes its IP address as it moves together with a host and, in the presence of ingress filtering, an application in the host is interrupted. 

The entire REQ2 is then:

   REQ2:  Bypassable network-layer mobility support

          DMM solutions MUST enable network-layer mobility but it MUST
          be possible to not use it.  Mobility support is needed, for
          example, when a mobile host moves and an application cannot
          cope with a change in the IP address.  Mobility support is
          also needed when a mobile router changes its IP address as it
          moves together with a host and, in the presence of ingress
          filtering, an application in the host is interrupted.  However
          mobility support at the network-layer is not always needed; a
          mobile node can often be stationary, and mobility support can
          also be provided at other layers.  It is then not always
          necessary to maintain a stable IP address or prefix.

H Anthony Chan

-----Original Message-----
From: Alexandru Petrescu [mailto:[email protected]] 
Sent: Wednesday, February 19, 2014 9:03 AM
To: h chan; [email protected]
Subject: Re: [DMM] I-D Action: draft-ietf-dmm-requirements-14.txt

H Anthony,

> REQ2: Bypassable network-layer mobility support
>
> DMM solutions MUST enable network-layer mobility but it MUST
>
> be possible to not use it. Mobility support is needed, for
>
> example, when a mobile host moves and an application cannot
>
> cope with a change in the IP address. Mobility support is
>
> also needed, for example, when a mobile router moves together
>
> with a host and an application in the host is interrupted by a
>
> change of IP address of the mobile router
>
> and the presence of ingress filtering.

Sounds good, technically.  Since this is already a long phrase maybe we could detail it further, and then later make it better, or separate.

How about this:

> Distributed Mobility Management support is also needed, for example, 
> when a Mobile Router moves together with a Host and an application 
> running in the Host (LFN) is disturbed by the change of address of the 
> Mobile Router.  Specifically, the incoming packets towards the Host 
> may be blocked at a Router in the path from the CN, or may be taking a 
> longer path through the Home Agent (in case Mobile IP is used); an 
> application sending packets from the Host may be blocked by the 
> ingress filtering potentially set in the access network, or may take a 
> longer path through the Home Agent (in case Mobile IP is used).

What do you think?

Alex



Alex

>
> However mobility
>
> support at the network-layer is not always needed; a mobile
>
> node can often be stationary, and mobility support can also be
>
> provided at other layers. It is then not always necessary to
>
> maintain a stable IP address or prefix.


Le 14/02/2014 00:35, h chan a écrit :
> Alex,
>
> Thanks for spelling out the conditions more accurately. Just to 
> confirm whether the addition the text in red as in the following is 
> needed for accuracy reasons.
>
> May I ask whether we can alternatively assume that ingress filtering 
> should always not be prevented. Then when the red text is missing as 
> in version 14, is that still incorrect or it needs to be corrected?
>
> REQ2: Bypassable network-layer mobility support
>
> DMM solutions MUST enable network-layer mobility but it MUST
>
> be possible to not use it. Mobility support is needed, for
>
> example, when a mobile host moves and an application cannot
>
> cope with a change in the IP address. Mobility support is
>
> also needed, for example, when a mobile router moves together
>
> with a host and an application in the host is interrupted by a
>
> change of IP address of the mobile router
>
> and the presence of ingress filtering.
>
> However mobility
>
> support at the network-layer is not always needed; a mobile
>
> node can often be stationary, and mobility support can also be
>
> provided at other layers. It is then not always necessary to
>
> maintain a stable IP address or prefix.
>
> H Anthony Chan
>
> -----Original Message----- From: dmm [mailto:[email protected]] On 
> Behalf Of Alexandru Petrescu Sent: Tuesday, February 04, 2014 3:28 AM 
> To: [email protected] Subject: Re: [DMM] I-D Action:
> draft-ietf-dmm-requirements-14.txt
>
> Thanks for this new version.
>
> A comment:
>
>> Mobility support is also needed, for example, when a mobile router
>
>> moves together with a host and an application in the host is
>
>> interrupted by a change of IP address of the mobile router.
>
> ^and presence of ingress filtering.
>
> Alex
>
> Le 03/02/2014 23:36, [email protected] 
> <mailto:[email protected]> a écrit :
>
>>
>
>> A New Internet-Draft is available from the on-line Internet-Drafts
>
>> directories. This draft is a work item of the Distributed Mobility
>
>> Management Working Group of the IETF.
>
>>
>
>> Title           : Requirements for Distributed Mobility Management
>
>> Authors         : H Anthony Chan Dapeng Liu Pierrick Seite
>> Hidetoshi
>
>> Yokota Jouni Korhonen Filename        :
>
>> draft-ietf-dmm-requirements-14.txt Pages           : 19 Date
>
>> : 2014-02-03
>
>>
>
>> Abstract: This document defines the requirements for Distributed
>
>> Mobility Management (DMM) at the network layer.  The hierarchical
>
>> structure in traditional wireless networks has led primarily to
>
>> centralized deployment models.  As some wireless networks are 
>> evolving
>
>> away from the hierarchical structure, a distributed model for 
>> mobility
>
>> management can be useful to them.
>
>>
>
>>
>
>>
>
>> The IETF datatracker status page for this draft is:
>
>> https://datatracker.ietf.org/doc/draft-ietf-dmm-requirements/
>
>>
>
>> There's also a htmlized version available at:
>
>> http://tools.ietf.org/html/draft-ietf-dmm-requirements-14
>
>>
>
>> A diff from the previous version is available at:
>
>> http://www.ietf.org/rfcdiff?url2=draft-ietf-dmm-requirements-14
>
>>
>
>>
>
>> Please note that it may take a couple of minutes from the time of
>
>> submission until the htmlized version and diff are available at
>
>> tools.ietf.org.
>
>>
>
>> Internet-Drafts are also available by anonymous FTP at:
>
>> ftp://ftp.ietf.org/internet-drafts/
>
>>
>
>> _______________________________________________ I-D-Announce mailing
>
>> list [email protected] <mailto:[email protected]>
>
>> https://www.ietf.org/mailman/listinfo/i-d-announce Internet-Draft
>
>> directories: http://www.ietf.org/shadow.html or
>
>> ftp://ftp.ietf.org/ietf/1shadow-sites.txt
>
>>
>
>>
>
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