Re: [netext] Chair review of I-D: draft-ietf-netext-pd-pmip (05)

jouni korhonen <jouni.nospam@gmail.com> Tue, 20 November 2012 19:56 UTC

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From: jouni korhonen <jouni.nospam@gmail.com>
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Date: Tue, 20 Nov 2012 21:56:18 +0200
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To: Basavaraj Patil <bpatil1@gmail.com>
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Subject: Re: [netext] Chair review of I-D: draft-ietf-netext-pd-pmip (05)
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Raj,

On Nov 20, 2012, at 6:40 PM, Basavaraj Patil wrote:

> 
> 
> I-D: Prefix Delegation for Proxy Mobile IPv6
> <draft-ietf-netext-pd-pmip-05> 
> 
> 
> Issues:
> -------
> 1. I-D states: "However, Proxy Mobile IPv6 does not support assigning
> a prefix to a router and  managing its IP mobility."
> 
> PMIP6 specifically mentions that the network based mobility solution
> is for a host (as defined in RFC3775). It would be useful to mention
> that this I-D is extending network based mobility support to routers
> as well.

Ok. I would write this as:

   responsible for managing IP mobility on behalf of the host.  However,
   Proxy Mobile IPv6 does not support assigning a prefix to a router and
   managing IP mobility for it and the networks it serves. This document

> 2. "This document specifies an extension to
>    Proxy Mobile IPv6 protocol for supporting network mobility using
>    DHCPv6-based Prefix Delegation."
> 
> Should it explicitly state that the extension to PMIP6 protocol is for
> enabling network mobility for routers?

Maybe.. see above.

> 3. "The mobility elements in the network allow the
>    IP host to obtain an IPv4 address and/or a set of IPv6 addresses
>    ..."
> 
> MAG/LMA assign the host an IPv6 prefix.

Could you elaborate a bit more?


> 4. Would be useful to mention how binding revocation is handled in the
> case of delegated prefixes to the MR.

Good point. That needs to be clarified.

> 5. How does the MAG know that it needs to allow forwarding of packets
> via the PMIP6 tunnel for packets with SRC address that are derived
> from the delegated prefixes? Its not clear if there is added
> functionality needed at the MAG to accomplish this.

Section 3.4.2 states it..? I don't quite get what is missing here..


> Editorial
> ---------
> 
> s/Proxy Mobile IPv6 enables IP mobility for a host without requiring
>    its participation in any mobility signaling, being the network
>    responsible for managing IP mobility on behalf of the host./Proxy
>    Mobile IPv6 enables IP mobility for a host without requiring 
>    its participation in any mobility signaling. Mobility agents within
>    the network are responsible for managing IP mobility on behalf of
>    the host.
> 
> s/However, this network-based mobility management support is specific
>    to an IP host and currently there is no such network-based mobility
>    management support for a mobile router with a cluster of IP hosts
>    behind it./However Proxy Mobile IPv6 support is specifically
>    intended for a host. Mobile routers can also benefit from the
>    network based mobility solution provided by Proxy Mobile IPv6. This
>    document extends Proxy Mobile IPv6 support to Mobile routers as
>    well.
> 
> s/for its inside networks/for the networks subtending off the MR.
> 
> s/just as how that is supported for Home Network prefixes/in a similar
> manner that the protocol supports hosts which are assigned home
> network prefixes.
> 
> s/The mobile router forwards outgoing packets from its
>    mobile network/The mobile router forwards outgoing or uplink
>    packets from the networks that are subtending off it
> 
> s/ and the MAG
>    delivers the incoming packets to the mobile network/and the MAG
>    delivers the downlink packets to the MR.
> 
> s/to be able to intercept the related DHCPv6 message sourced from the
> mobile router /in order to intercept the related DHCPv6 message
> transmitted by the MR.
> 
> s/If the network mobility service needs to be offered to the mobile
>    router/If the network mobility service is authorized for the mobile
>    router 
> 
> s/This requires the MAG to send a regular
>         PBU to the LMA to register the location of the mobile router and
>         set-up the bi-directional tunnel./This requires the MAG to
>         send a regular PBU (with flag R set) to the LMA to register the
>          mobile router and set-up the bi-directional tunnel.


Cumulative ACK for the rest.

- Jouni


> 
> 
> 
> -Raj
> 
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