Re: [manet] multi-gateway support draft

[Shubhranshu <shubhranshu at samsung.com>]

----- Original Message ----- 
From: "Francisco Ros" <fjrm4 at yahoo.es>
To: <manet at ietf.org>
Sent: Wednesday, September 08, 2004 7:33 AM
Subject: [manet] multi-gateway support draft


> 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!
>


Two possible cases: 
 
 First, mobile node uses the routing header (considering it knows AR address). In this case
 it should be [src=MN, dst=C.GW] [ dst1=AR, dst2=H] 
 
 Second, candiadate gateway uses the proxy routing header. In this case it 
receives packet from MN with [src=MN, dst= C.GW] [dst1=H]  then the candidate gateway changes it
as  [src=MN, dst=AR] [dst1=H, dst= C.GW]
 
 After receiving packet with routing header, internet node replies to MN with 
header:  [src=H, dst=AR] [dst1=C.GW, dst2= MN]
 
 ( C.GW=candidate gateway address )
 
 New draft version with better/detail explanation will be published soon.

Thanks
Shubhranshu 





_______________________________________________
manet mailing list
manet at ietf.org
https://www1.ietf.org/mailman/listinfo/manet