RE: [Mip4] RE: Questions on draft-leung-mip4-proxy-mode-03.txt

Hi,kent

	I think the home agent address is the address of the interface face
to MN or FA. But the Home address of MN is inverse, it face to internet. So
when can they be the same except the HA only have one interface?
	Meanwhile,it seems that the p2p link mode and shared link mode are
all can be used here,right?But to p2p link mode,the default gateway seems
should be the MAG. It is right at least logically.So what is the role of the
Home agent in p2p link mode if we use it as the default gateway?
	My two cents.
	Best Rgds,
Thanks,
John.zhao
> -----邮件原件-----
> 发件人: Kent Leung (kleung) [mailto:kleung@cisco.com]
> 主题: RE: [Mip4] RE: Questions on draft-leung-mip4-proxy-mode-03.txt
> 
> I should clarify that Config Option Exchange Ext is not necessary when
> the Home Agent address and the Home Address are on the same subnet.  In
> this case, the default gateway is the Home Agent address.
> 
> Kent
> 
> -----Original Message-----
> From: Kent Leung (kleung)
> Sent: Tuesday, September 18, 2007 10:08 PM
> To: Tjandra Paula-CPT015; Gopal Dommety (gdommety); Parviz Yegani
> (pyegani); kchowdhury@starentnetworks.com
> Cc: mip4@ietf.org
> Subject: [Mip4] RE: Questions on draft-leung-mip4-proxy-mode-03.txt
> 
> Comments below.
> 
> -----Original Message-----
> From: Tjandra Paula-CPT015 [mailto:Paula.Tjandra@motorola.com]
> Sent: Monday, September 17, 2007 9:46 AM
> To: Kent Leung (kleung); Gopal Dommety (gdommety); Parviz Yegani
> (pyegani); kchowdhury@starentnetworks.com
> Cc: mip4@ietf.org
> Subject: RE: Questions on draft-leung-mip4-proxy-mode-03.txt
> 
> Thanks for the response Kent.
> 
> Few more comments:
> Section 5:
> It should be clarified that "Proxy Mobile IPv4 Mode Extension" and
> "PMIPv4 Per-Node Authentication Method Extension" are mandatory only
> when per-node Security Association is used.
> 
> KL> Yes, this is clarified in the next version.
> 
> General:
> Assuming you added a reference to draft-ietf-mip4-gen-ext-04.txt to
> provide the host configuration information, I think there should also be
> a section to cover compatibility with Home Agent that does not support
> draft-ietf-mip4-gen-ext-04.txt.
> 
> KL> I know that there are implementations that support RFC 4332.  The
> right method is requiring the MAG/PMA and HA to support
> draft-ietf-mip4-gen-ext.
> 
> 
> E.g.
> If the home network prefix mask is not provided in Config Option
> Exchange Ext., what should be the prefix mask return in the DHCP
> response? If default gateway information is not provided in Config
> Option Exchange Ext., should the MAG assume that the first address in
> the range of IP address associated with the HoA (HoA's subnet or assumed
> HoA's subnet) is the IP address of the default gateway?
> 
> KL> See above.
> 
> Kent
> 
> I am not sure if accuracy if important if all packets will be sent back
> to LMA anyway. But, I think we need consistency in the implementation to
> handle this case.
> 
> Thanks, Paula.
> 
> -----Original Message-----
> From: Kent Leung (kleung) [mailto:kleung@cisco.com]
> Sent: Friday, September 14, 2007 10:50 AM
> To: Tjandra Paula-CPT015; Gopal Dommety (gdommety); Parviz Yegani
> (pyegani); kchowdhury@starentnetworks.com
> Cc: mip4@ietf.org
> Subject: RE: Questions on draft-leung-mip4-proxy-mode-03.txt
> 
> Hi Paula.  Comments below.
> 
> -----Original Message-----
> From: Tjandra Paula-CPT015 [mailto:Paula.Tjandra@motorola.com]
> Sent: Thursday, September 13, 2007 12:41 PM
> To: Kent Leung (kleung); Gopal Dommety (gdommety); Parviz Yegani
> (pyegani); kchowdhury@starentnetworks.com
> Cc: mip4@ietf.org
> Subject: Questions on draft-leung-mip4-proxy-mode-03.txt
> 
> Hi,
> 
> I have a couple of questions on this draft.
> 
> First question is on how DHCP Proxy (in the MAG) populates the DHCP
> Offer. The draft only indicates that the IPv4 address set to the
> received HoA (from the Proxy MIP RRP).
> draft-ietf-mip4-gen-ext-04.txt describes mechanism to provide the host
> configuration. Should this internet draft be referenced for the purpose
> of obtaining host configuration?
> 
> KL> Yes, we will reference this draft in the next version.
> 
> Second question, on section 9.3: the draft seems to imply that the MN's
> default gateway is set the LMA (the Home Agent).
> The LMA/Home Agent might not be in the same subnet as the HoA. Will this
> cause a problem with the IP stack which requires the default gateway to
> be in the same subnet as the HoA
> 
> KL> We will need to clarify that the MN's default gateway is set to the
> LMA/HA's IP address on the subnet associated with the HoA.  This is one
> of the information that comes from Config Option Exchange Ext.
> 
> Thx.
> 
> Kent
> 
> Regards,
> Paula Tjandra.
> 
> 
> 
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