Hi Tian,
Try this. Try to reduce the router adv interval. I
think you are currently sending RADVDs every few
miliseconds.
Could you try to reduce that and see how much is the
delay. It could be that the RADVDS have been present
and they were in a buffer so your Mobile Node is
processing that.
Anyways good observation, i will try to give a more
solid explanation after few tests.
rgds,
Shariq
--- tian tian <[EMAIL PROTECTED]> wrote:
---------------------------------
Hi!
During the analysis of the handover latency of MIPv6,
I got a confused question.
A normal MIPv6 handover process is as follows:
1.[movement Detection] --> 2.[Router Discovery] -->
3.[Address Congifuration]-->4.[DAD]-
->5.[HA Registration]-->6.[CN Registration]
The first four componets are with no problems. So hier
I just focus the last two components.
The HA registration (the MN CoA registed to HA) time
is defined as the transmission delay incurred during
registration of the MN CoA with its HA. It begins from
the MN sends BU to its HA until the MN receives the BA
sent by HA.
And then, the MN must start the Return Routability
Procedure (RRP) before it sends a BU to CN.That is,
the MN must first initiate the Home Test (HoT) and
Care-of Test before it can send a BU to CN.
But I observed from the package information catched by
ethereal, there was always a time delay between the BA
sent by HA and HoT (the start of RRP), one example is
shown below:
*fe80::202:2dff:fe07:9948 is the IPv6 address of the
new Access Router (AR),
2001:106:1200::2 is the Home Address of MN
2001:106:1200::1 is the address of the HA
2001:106:2600::2 is CN's address
2001:106:1100:0:204:23ff:fe5f:163e is MN's CoA when
it left its homenet and moved to a visitnet.
========================================================================================
1. Seq. time Sorce Address
Distination Address
-----------------------------------------------------------------------------------------
....
2243 114.215153 fe80::202:2dff:fe07:9948 ff02::1
ICMPv6 Router advertisement
2244 114.275060 fe80::202:2dff:fe07:9948 ff02::1
ICMPv6 Router advertisement
2245 114.331100 fe80::202:2dff:fe07:9948 ff02::1
ICMPv6 Router advertisement
2246 114.367109 fe80::202:2dff:fe07:9948
ff02::1:ff5f:163e ICMPv6 Neighbor solicitation
2247 114.367168 2001:106:1100:0:204:23ff:fe5f:163e
fe80::202:2dff:fe07:9948 ICMPv6 Neighbor
advertisement
2248 114.369291 2001:106:1200::1
2001:106:1100:0:204:23ff:fe5f:163e MIPv6 Binding
Acknowledgement (BA sent by HA to MN)
---------------------------------------------------------------------------------------
2249 114.395042 fe80::202:2dff:fe07:9948 ff02::1
ICMPv6 Router advertisement
2250 114.451152 fe80::202:2dff:fe07:9948 ff02::1
ICMPv6 Router advertisement
2251 114.503107 fe80::202:2dff:fe07:9948 ff02::1
ICMPv6 Router advertisement
2252 114.556071 fe80::202:2dff:fe07:9948 ff02::1
ICMPv6 Router advertisement
2253 114.623126 fe80::202:2dff:fe07:9948 ff02::1
ICMPv6 Router advertisement
2254 114.667084 fe80::202:2dff:fe07:9948 ff02::1
ICMPv6 Router advertisement
2255 114.677178 2001:106:1200::2
2001:106:2600::2 ICMPv6 Echo request
2256 114.680095 2001:106:2600::2
2001:106:1200::2 ICMPv6 Echo reply
----------------------------------------------------------------------------------------
2257 114.681259 2001:106:1200::2
2001:106:2600::2 MIPv6 Home Test Init(RRP
start)
2258 114.681454 2001:106:1100:0:204:23ff:fe5f:163e
2001:106:2600::2 MIPv6 Care-of Test Init
2259 114.684111 2001:106:2600::2
2001:106:1200::2 MIPv6 Home Test
2260 114.686225 2001:106:2600::2
2001:106:1100:0:204:23ff:fe5f:163e MIPv6 Care-of
Test
2261 114.686647 2001:106:1100:0:204:23ff:fe5f:163e
2001:106:2600::2 MIPv6 Binding Update
2262 114.689347 2001:106:2600::2
2001:106:1100:0:204:23ff:fe5f:163e MIPv6 Binding
Acknowledgement (Handover completed)
============================================================================================
As shown in the above table, a delay of 0.32s is
caused by the blue colored RAs sent by the AR and also
ICMPv6 Echo request and reply between the BA sent by
the HA and the start of RRP. And some other tests even
got a worse delay time than this.
What is this delay? Which fators are possible to cause
this delay? Anyone has idea about it?
Any suggestion will be very appreciated!
Tian
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