Teco Boot wrote:
> Hi All,
>
> The I-D "Analysis of MANET and NEMO" is
published on IETF:
> http://www.ietf.org/internet-drafts/dra
ft-boot-manet-nemo-analysis-00.txt
>
> I was requested to publish the link for the I-D on the
WG MLs.
> I ask special attention on the "Worst Path First
syndrome", section 3.7.
Thanks for pointing to the MANEMO WPF syndrome problem, let
me paste the
illustrative figure here:
> +-----+
> | MR1 |
> +-----+
> 11Mbps / |
> loss / |
> <1% / | 1Mbps
> +-+-+ | loss ~50%
> |MR2| |
> +-+-+ |
> 11Mbps |
> loss |
> <1% |
> +-+-+
> |MR3|
> +---+
>[...]
> [MR3] Selecting the direct path to MR1 is the worst in
terms of
> bandwidth (1Mbps where 11Mbps is available), packet
loss (50% where
> less than 2% is available) and used spectrum (single
transmission
> over 1Mbps takes more time for sending a packet than 2
times over
> 11Mbps).
I think this problem looks very much like a problem where a
Mobile Host
is presented with two WiFi access networks, without any hint
about which
is better to the Internet. This problem is not documented
as such, but
I believe MONAMI6 describes a similar problem with
'multi-homing' terms:
draft-ietf-monami6-mipv6-analysis-02.txt:
> (H1,Cn): [Mobile Host has] 1 HoA, n CoAs
>
> Another possible configuration is a MN with several
interfaces
> connected to different links. Note that one of the
interfaces of the
> MN may be connected to its home link.
>
> Achievable goals: Reliability, Load Sharing, Interface
switching (if
> the MN is equipped with several interfaces) [...] o
Load Sharing
> and Interface Switching
>
> This configuration allows to share the load and set
preferences among
> different paths between the HA and the MN when BT mode
is used, and
> between the CN and the MN when RO mode is used. In
order to achieve
> load sharing and interface switching under this
scenario, the MN
> would need to register several CoAs with its unique
HoA. However,
> the present specification of MIPv6 only allows the MN
to register a
> single CoA per HoA. This is discussed in Section
6.2.1. When a
> single HoA is bounded to several CoAs at the same time,
the MN or
> HA/CN must be able to select the appropriate CoA.
Based on this comparison, do you think that WPF syndrome is
related to
the (H1, Cn) MONAMI6 Scenario? Or to another MONAMI6
Scenario? Or not
at all to MONAMI6?
Alex
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