Re: [Mipshop] home addr option doubt

Emil Ivov wrote:
> Hello,
> 
> We had a little trouble understanding the exact place where a Home
> Address option is to be included.
> 
> All that Section 6.3.1 of draft-ietf-mipshop-fast-mipv6-03.txt says is:
> The FBU MUST also include the Home Address Option and the Home
> Address is PCoA.
> 
> One way to do it would be to include the Home Address Option as an
> option of the FBU itself.
>     If that is the case shouldn't this be clarified a bit more? It could
> probably also be included in the  "Mobility Options" part of the message
> format together with:
> 
>       MUST contain alternate CoA option set to NCoA IP
>       address when FBU is sent from PAR's link.
> 
> Another way to send the HAO would be to include it in a destination
> options header as with BUs?

section 6.3.1 is talking about the Home Address Option in a destination
options header. not as a mobility option.

>     If this is the case how should it be transported when an FBU is
> encapsulated in an FNA? As a destination option of the FNA, or should
> the AR addit when resending the FBU?

the FBU will be an IP packet inside the FNA. the payload proto field
in FNA will be set to IPv6. here is the packet format

   IPv6 hdr (src=nCoA, dst=NAR)
   Mobility Hdr
       FNA
   IPv6 hdr (src=nCoA, dst=PAR)
   Dst Opts hdr
       Home Address option (pCoA)
   Mobility Hdr
       FBU

the NAR first processes the FNA part of the packet. if nCoA is valid,
it forwards the inner IP packet to the PAR.

   IPv6 hdr (src=nCoA, dst=PAR)
   Dst Opts hdr
       Home Address option (pCoA)
   Mobility Hdr
       FBU

Vijay

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