Re: [MEXT] IPv4 home address option in DSMIP

[Hesham Soliman <hesham at elevatemobile.com>]

On 17/01/09 7:17 PM, "Shi Xiaoyan" <shi_xyan at huawei.com> wrote:

> Hi Hesham,
>  
> Section 5.4.2
>  
>    When sending a binding update from a visited network that supports
>    IPv6, the mobile node MUST follow the rules specified in [RFC3775].
>    In addition, if the mobile node has an IPv4 home address or needs
>    one, it MUST include the IPv4 home address option in the mobility
>    header.  
>  
> Does the IPv4 home address option must be include in Binding Update even if
> BU is send for extend binding lifetime?

=> Yes. 

> I think it is redundant since only IPv6 HoA is the key for BCE lookup. In
> maillist, I find some disscussion mails about this quesion, but I can't find
> the reason why all BU must include IPv4 home address option.

=> Two reasons:
1. This is how a BU works, all options need to be included in order for a
binding to be refreshed
2. The only way the MN can delete the IPv4 binding is to not include it in
the BU. 

Hesham

>  
> 
> Regards,
> Xiaoyan


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