an example of optimistic DAD in action, with MIPv6

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.

Best of Show Winner, ESC 2003
Click on the link and take a look!
http://cmp.iconvention.com/escshowdaily/v33/index.cvn?ID=10183
 

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.497 / Virus Database: 296 - Release Date: 7/4/2003