[support] when do MN's NEPL perform the mn_do_dad function?

[Romain KUNTZ]

Hi Tony,

On 2009/08/18, at 20:13, tony chen wrote:
> We all know the MN perform the dad process when the MN return the  
> home network.

Well, actually not exactly. Section 11.5.4 of RFC3775 states:

"In addition, when returning home prior to the expiration of a current  
binding for its home address, and configuring its home address on its  
network interface on its home link, the mobile node MUST NOT perform  
Duplicate Address Detection on its own home address, in order to avoid  
confusion or conflict with its home agent's use of the same address.  
[...] If the mobile node returns home after the bindings for all of  
its care-of addresses have expired, then it SHOULD perform DAD."

In other words, if the MN still has an active binding, it does not  
perform DAD when returning home.

Cheers,
romain

> I use the "iwconfig" instuction to transform the ESSID from foreign  
> network to home network,
> but the MN's NEPL program doesn't profrom the dad process.
>
> I guess the MN perform the dad process at mn_do_dad function,so I  
> insert a debug message in this function.
> When I do the handover action , there is not any debug message about  
> dad at the MN.
>
> I think is the check handover isn't active because I use the  
> iwconfig instruction ?
>
> Thanks everybody.
>
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