Re: [manet] multi-gateway support draft

[Shubhranshu <shubhranshu at samsung.com>]

El Viernes, 10 de Septiembre de 2004 18:28, Shubhranshu escribiÃ:
> Francisco,
>
> Its a typo. It should be [src=MN, dst=AR] [dst1=H]
>
>Sorry for disturbing again :-), but if C.GW sends such a packet then H will
>not be able to answer with [src=H, dst=AR] [dst1=C.GW, dst2= MN] (because it
>won't know about existence of C.GW).

>By the way, is there any advantage by using proxy routing header? If you don't
>use it there exists a simpler solution:
>MN -> [src=MN, dst= C.GW] [dst1=H]
>H -> [src=H, dst=C.GW] [dst1= MN]

>What do you think about this? Thanks in advance.



Candidate gateway appends C.GW and not discard it after processing
the routing header (this is not just swapping of addresses and was not
reflected in my previous e-mail ).

In your solution the AR will tend to forward packet via default gateway (and not candidate gateway).
Routing header is processed *only* by the destination nodes.

Thanks for your comments.



> ----- 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!
> >



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