Hello Alper,  

I still have the following comments:

1. Regarding the definition of “fixed IP address” in the draft:

  “- Fixed IP Address
This is what standard Mobile IP provides with a Home Address (HoA). The mobile 
host is configures a HoA from a centrally-located Home Network. Both IP session 
continuity and IP address reachability are provided to the mobile host with the 
help of a router in the Home Network (Home Agent, HA). This router acts as an 
anchor for the IP  
address of the mobile host.”  

If this is equal to HoA, then RFC5014 already cover that. We do not need to 
repeat it here with another name.

2. Regarding the definition of “sustained IP address” in the draft:

"- Sustained IP Address This type of IP address provides IP session continuity 
but not IP address reachability. It is achieved by ensuring that the IP address 
used at the beginning of the session remains usable despite the movement of the 
mobile host. The IP address may change after the termination of the IP 
session(s), therefore it does not exhibit persistence. "  
There is no clear dividing line between fixed IP address and sustained IP 
address. Whether the IP address is used for reachability is not determined by 
the IP address itself. For example, even when the MN get a HoA, after it moves 
to another location of the network, it may decide to release current HoA and 
get another HoA, in this case the "fixed IP address" becomes a "sustained IP 
address".

Further more, the reachability normally is implemented by domain name instead 
of IP address. For example, we reach “Google” by its domain name, never by it’s 
server’s IP address.  

Using temporary private IP address we can also achieve the goal of 
“reachability”. For example, using dynamic DNS, as shown in  
http://hsk.oray.com/ , it can  provide reachability even the host get a private 
IP address.

3. Regarding the definition of “nomadic IP address”:

“- Nomadic 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.”

Seems this IP address is the IP address that we normally used in most cases. If 
this is the case, why we need a new name for it?


--  
Dapeng Liu


在 2015年3月25日 星期三,下午2:02,Alper Yegin 写道:

> Hello Dapeng and Alex,
>  
> I hope you had a chance to digest our responses to your comments and 
> questions about the API work.
> If you have any remaining issues, please let us know over the email at your 
> earliest convenience.
> It'd be good if you can articulate them in detail.
>  
>  
> Thanks.
>  
> Alper  

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