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

[girish gupta <girishkg at gmail.com>]

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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