Re: an example of optimistic DAD in action, with MIPv6

Hi Ed,

It's really cool that you've done this.
I liked the packet capture too.

As you may know, there seemed to be interest
in the DNA BoF session on friday to pursue
DAD optimization in that forum.
(So it may be that Opti-DAD has a home).

Greg


Ed Remmell wrote:
> Hello,
> 
> Attached is a packet capture of the Elmic Systems' MIPv6 MN performing a
> handover per Eager Cell Switching, IPsec/IKE is being used between the
> HA and the MN with the (K) bit set to 1 in the BU/BA, the CN is
> 3ffe:3333::3333 and is setup to continuously ping the MN's home address
> 3ffe:aaaa::bbbb. The MN implements optimistic DAD. Handover performance
> (once movement detection has occurred, i.e. once a Router Advertisement
> from a new router is received) is very fast, less than 50 msec between
> frame #1 (RA) and frame #14 (BA from the CN). The CN continues ping'ing
> the MN at its new primary care-of address using route optimization
> (frames #16, 17). We have our CN ping client setup to use a 1-second
> delay between pings, which is why there is a delay between frame #14 and
> frame #16. Frame #15 is the MN completing DAD on its auto-configured
> link-local scope address. Frames #8 and 9 are interesting, because they
> show optimistic DAD in action (i.e. the router solicits the MN's
> auto-configured primary CoA, the MN responds with a NA for that CoA but
> the override bit is cleared). Frame #5 is the MN sending the BU to the
> HA, and frame #10 is the HA's BA response. The SAs used to protect this
> BU/BA exchange were negotiated earlier using IKE, and as you see from
> this trace the phase 1 SAs do not need to be renegotiated due to the
> (K)=1 Key Management Mobility Capability. The HoTI/HoT exchange is
> protected using manually-keyed IPsec SAs.
> 
> Thanks.
> - Ed Remmell
> Elmic Systems USA, Inc.
> 
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