DHCP force renew

Simon Hobson dhcp1 at thehobsons.co.uk
Tue Aug 14 09:49:12 UTC 2012

Vijayakumar T. T. wrote:

>We have a specific project requirement in which the client system 
>needs to register the credentials on a portal. Registration purpose, 
>the client will get a quarantined IP (Restricted IP) from DHCP 
>server to access the portal. Once user register the credentials, the 
>client should get an IP from a different pool, which will have 
>complete access to network.
>Is there any mechanism by which I can ask a client system to renew 
>the DHCP setting ...

There isn't any way to force (from the server) the client to renew. I 
believe the 'standard' way to deal with it is to set a short maximum 
lease time on the quarantine pool so that the client will naturally 
renew in a short space of time. If you combine this with setting 
suitable expectations from the user - eg make it well known that 
policy is that access will be granted within 5 minutes, not instantly 
- then this should work.

Simon Hobson

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