Re: [netlmm] IPv4 Support

Hi Alex, I realized I never got back to you on this. Here is a
call flow for this. I haven't show the DHCP server in the call
flow.

Lets check if we are all on the same page on this topic.

Vijay

Vijay Devarapalli wrote:
> Hi Alex,
> 
> Instead of trying to answer your email point-by-point we 
> will try to put out a call flow for this.
> 
> Vijay
> 
>> -----Original Message-----
>> From: Alexandru Petrescu [mailto:alexandru.petrescu@gmail.com] 
>> Sent: Tuesday, March 13, 2007 12:28 PM
>> To: Vijay Devarapalli
>> Cc: Alexandru Petrescu; Behcet Sarikaya; Jari Arkko; netlmm@ietf.org
>> Subject: Re: [netlmm] IPv4 Support
>>
>> Vijay Devarapalli wrote:
>>> Alexandru Petrescu wrote:
>>>> Vijay Devarapalli wrote:
>>>>> Hello Alex and Behcet,
>>>>>
>>>>> draft-sgundave-mip6-proxymip6-02 also provides support for an
>>>>> IPv4-only mobile node. The mobile node need not have a dual
>>>>> stack. See section 5.6.
>>>>>
>>>>> The IPv4 home address given to the mobile node is from a shared
>>>>> prefix from the LMA. There is no per-MN IPv4 prefix.
>>>>  >
>>>>> Shared prefix is out of scope currently only for IPv6 addresses
>>>>> for the mobile node.
>>>> So can one say PMIPv6 does shared-prefix for IPv4 but 
>> prefix-per-MN 
>>>> for IPv6?
>>> Yes. That is what is assumed in 
>> draft-sgundave-mip6-proxymip6-02 currently.
>>>>> The MAG gets the IPv4 address for the mobile node from the LMA
>>>>> using Proxy BU/Proxy BAck messages. After that the address is
>>>>> assigned to the mobile node using DHCP.
>>>> How does  DHCP implementation on MAG know to _not_ do DHCP?
>>> I don't understand this question.
>> Well who does DHCP DISCOVER?  MN.  Who does DHCP ACK?  MAG.
>>
>> How does MAG know to _not_ relay the DISCOVER to DHCP Server and do 
>> P-BU/BAck instead?  Is that a DHCP modification?  Shouldn't 
>> that be made 
>> clear that PMIPv6 requires DHCP modifications?
>>
>>>> This is what you imply: LMA gets DHCP request and then obtains the 
>>>> IPv4 address with PBU/PBAck.
>>> The DHCP request does not go to the LMA. Only upto the MAG. Proxy 
>>> BU/Proxy BAck is used between the MAG and the LMA.
>> How does MAG _know_ to _not_ send the DHCP Request received 
>> from MN?  A 
>> DHCP implementation _does_ forward the DHCP Request.  Provided it's a 
>> DHCP Relay, of course.  I hope both you and me assume the MAG 
>> is a DHCP 
>> Relay.
>>
>> Besides, it's not the DHCP Request that MAG receives first, it's the 
>> DHCP DISCOVER.  It's upon DHCP DISCOVER that MAG should act, not upon 
>> DHCP Request.
>>
>> Alex
>>
>>
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> 
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Re: [netlmm] IPv4 Support

Attachment: PMIPv6-IPv4-only-MN.pdf