[manet] multi-gateway support draft

[Francisco Ros <fjrm4 at yahoo.es>]

Hi everybody!

I am studying several proposals for providing Internet connectivity to manets. 
Now I am reading "Mobile multi-gateway support for IPv6 mobile ad hoc 
networks" (draft-singh-manet-mmg-00) and have some doubts regarding it.

I cannot understand properly section 4.2 (Routing policy). Please look at this 
two paragraphs:

<<
   Default gateway can route traffic originating from manet node and
   whose destination is internet node using default route while the
   candidate gateways should route such traffic either using proxy
   routing header or tunneling mechanism.  In proxy routing header
   destination address of IPv6 header is set to the Internet access
   router address while final destination address set to internet node
   address and original source address set to routing header.  Proxy
   routing header indicates to internet node that the packet travel via
   candidate internet gateway and access router.  In response to this
   received packet, internet node must use candidate internet gateway
   and original source address in the routing header.
>>

As far as I understand, ongoing packets look like [src=MN, dst1=AR, dst2=H] 
and incoming ones like [src=H, dst1=CG, dst2=MN]. This has no sense for me so 
I suppose I am misunderstanding something, aren't I?
(MN = manet node, AR = access router, H = internet host, CG = candidate 
gateway)

Besides specification does not mention how packets sent by MN are. I think 
they should by like [src=MN, dst1=CG, dst2=H].

<<
   If manet node uses tunneling mechanism, candidate internet gateways
   encapsulate packets to the internet node.  Tunneling header has
   source address as candidate internet gateway and destination address
   as internet node.  The internet node decapsulates the packet and
   replies with tunneling header with source address as internet node's
   address and destination address as candidate internet gateway's
   address.
>>

Could someone explain how are packets sent by MN, CG and H please?
I suppose that they could be (alhough is not clear for me):
MN -> [src=MN, dst1=CG, dst2=H]
CG -> [src=CG, dst=H][src=MN, dst=H]
H -> [src=H, dst=CG][src=H, dst=MN]

I hope that someone could clarify all this. Thanks in advance!

Regards, Francisco Ros

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