Pekka,
On 2009-01-19 20:23, Pekka Nikander wrote:
> One of the repeated arguments against host-based solution is that it
> increases signalling load. Of course, that is true for a pure
> host-based solution where each host individually maintains the mapping
> from EIDs to RLOCs. So, from a signalling load point of view, such a
> solution is not very good if the mapping granularity is at the site level.
>
> There is a relatively easy solution to this, which brings the inter-site
> signalling load to the level of tunnel-router-like maps-and-encaps
> solution. The basic idea is that the hosts *delegate* the signalling to
> a tunnel-router-like device at the site border.
Ran Atkinson has observed that for IPv6, RA messages could be used as a
way to indicate prefix "liveness" in real time (see section 2.3 of
draft-carpenter-renum-needs-work-01). No doubt a similar mechanism could
be retrofitted to IPv4. That would make it equally possible to delegate
the liveness function, if needed, to the border device.
Brian
> (At the same time, the
> hosts can still signal individually through another interface; consider
> e.g. a laptop which is attached with a wire to a corporate site but at
> the same time has a wireless interface using an open WLAN.)
>
> So, when both a host and a site support a (multi-homing/mobility)
> solution, the following can be done:
>
> 1. The host detects that the site supports the solution, e.g. through
> DHCP/ND.
> 2. The host delegates any mobility/multihoming/tunnelling signalling to
> the TR at the site.
> 3. The site border TR/whatever takes care of signalling on the host's
> behalf.
>
> When considering HIP, the theory is discussed in length in Jukka
> Ylitalo's Ph.D.
> http://lib.tkk.fi/Diss/2008/isbn9789512295319/
>
> For a practical example, see Section 4 of draft-melen-hip-mr-01.txt
>
> For measurement results, see Jukka Ylitalo, Jan Melén, Patrik Salmela,
> and Henrik Petander, "An Experimental Evaluation of a HIP based Network
> Mobility Scheme", in Proc. of the 6th International Conference on
> Wired/Wireless Internet Communications (WWIC 2008), pp. 139-151,
>
> --Pekka Nikander
>
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