How to Force Client's DHCP Renew on Mobility Event?

Hi All,
I have a (single) client (it is a cisco IOS router) behind a wireless workgroup bridge (cisco1242).
The client's IP address is obtained via DHCP from the wired network.
Now, when roaming occurs, the Client will never have knowledge about this event,
and hence will not renew its IP address until lease expiers.
This is not a problem of course when Layer 2 roam occurs, but with Layer 3
roam it will interrupt the traffic.
The cisco's IP Mobile implementation does have this issue addressed in DCCoA
scenario: the WGB is configured to send an SNMP trap on its dotradio state change;
the cisco mobile router is configured with snmp-server manager to process this trap
and start DHCP renew on the Down/Up event. Unfortunately, this works in Mobile IP
scenario only because I cannot make it work without the mobile router registered
with a home agent.
I wonder if someone could come up with an idea on how to force DHCP renew
on a client (cisco IOS router) in such a situation - event scripting, SLA, or ...?
alex
============================

Yes, George, I've looked at this.
The problem with dynamic anchoring with static IP address is how
the (new) WLC detects the IP address of the client. Remember that
my client is cisco router with network(s) behind it. Snooping the
ARP request will not work since ARP timeout in IOS is 4 hours.
Orphan packet handling (I understand it is intercepting the IP
packet from client without reply(?)) will most probably give erroneous
result as this packet can be a packet from a network behind the router.
alex
====================================

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Please remember to mark the replies as answers if they help and un-mark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
[email protected]

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Thanks.

Thank you Tariq for your prompt reply.
I'm don't understand how CoA fix the problem of the workstation. CoA tells the swtich to assign a new VLAN, but it's not CoA per se that tells the workstation to reset the IP address, since CoA is between ISE and the switch only. It must be ISE then that send a DHCP release / renew command to the workstation. I presume that for a Guest user that is done in the browser by Activex. So maybe the problem is that the web browser is not accepting ActiveX coding? If you have any other information on the DHCP release / renew process wiith CWA, it would be appreciated.
Thank you again for all the great posts you are contributing to this forum.
Catherine

How to Force Client's DHCP Renew on Mobility Event?

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