Re: [dhcwg] DHCP server deleting the IP-MAC binding entry

[pavan_kurapati <pavan_kurapati at infosys.com>]

Girish,
Check RFC 3203 for DHCP FORCERENEW message which you can use for the below scenario.

Thanks,
Pavan

> -----Original Message-----
> From: dhcwg-bounces at ietf.org [mailto:dhcwg-bounces at ietf.org] On Behalf
> Of girish gupta
> Sent: Friday, October 09, 2009 10:35 AM
> To: dhcwg at ietf.org; GAURAV HALWASIA
> Subject: Re: [dhcwg] DHCP server deleting the IP-MAC binding entry
> 
> Hi Gaurav,
> 
> What I proposed is the quick convergence of DHCP database on Clients
> and DHCP Snooping switches to be consistence with DHCP Server
> database.
> Existing mechanism do not provide any such mechanisms. Another point
> is that since the binding entry is being deleted from DHCP server,
> DHCP server can offer the same IP address to some other new clients
> and client SHOULD have been implemented for sending ARP request for
> detecting the already assigned IP addresses else it will add to more
> confusion....
> 
> Thanks,
> Girish
> 
> 
> 
> On Thu, Oct 8, 2009 at 2:32 PM, GAURAV HALWASIA
> <gauravh278 at yahoo.co.in> wrote:
> > Hi Girish,
> >
> > As per protocol DHCP Server will not send any DHCP message to client
> in case
> > adminitrator manually clears the DHCP bindings.
> >
> > DHCP clients will get re-initialized automatically after it's renew
> requests
> > will not get responded. It might not be great idea to force the
> client to
> > release the IP address before the lease time gets expired.
> >
> >
> > Regards,
> > Gaurav Halwasia
> >
> > ________________________________
> > From: girish gupta <girishkg at gmail.com>
> > To: dhcwg at ietf.org
> > Sent: Thu, 8 October, 2009 2:16:28 PM
> > Subject: [dhcwg] DHCP server deleting the IP-MAC binding entry
> >
> > Hello Experts,
> >
> > I read RFC 2131 and have the following query -
> >
> > If the administrator manually deletes the dhcp IP-MAC binding entry
> > from the DHCP server database, is there any DHCP message generated
> for
> > it? I think it is not generated. Please let me know if we are missing
> > anything. Will it not be a good idea to generate a new DHCP message
> > which can flush the state of DHCP clients/DHCP Snooping switches and
> > re-initialize their state machines?
> >
> > Please let me know your thoughts.
> >
> > Thanks,
> > Girish
> > _______________________________________________
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> >
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