Re: [manet] multi-gateway support draft

[Shubhranshu <shubhranshu at samsung.com>]

Francisco,

Its a typo. It should be [src=MN, dst=AR] [dst1=H]


----- Original Message ----- 
From: "Francisco Ros" <fjrm4 at yahoo.es>
To: "Shubhranshu" <shubhranshu at samsung.com>
Cc: <manet at ietf.org>
Sent: Thursday, September 09, 2004 7:50 AM
Subject: Re: [manet] multi-gateway support draft


Thank you very much for your answers, now I can understand it better :-).
But I am still having a doubt. Please see below.

El Viernes, 10 de Septiembre de 2004 07:43, Shubhranshu escribiÃ:
> ----- 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]
                                                                                   ^^^^^^^^^^^^^
Is this a typo or did you actually want to write that? As far as I know this
would cause the remote host to forward the _same_ packet to C.GW, which is
not the desired behavior (at least if we are using routing headers of type 0
as defined by RFC 2460). Are you thinking about some special type of routing
headers to support correct behavior? Or what am I missing?

Thanks again ;)

Regards, Francisco Ros

>
>  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

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