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

[girish gupta <girishkg at gmail.com>]

Hi Pavan,

Thanks. Thats what I was looking for.
It would be good if it can be explicitly mentioned in section  - "2.3
Example usage" of the RFC 3203.

Yves, Christian, Is it possible to add another subsection 2.3.4 under
Example section 2.3, mentioning that the FORCERENEW message should be
generated when the administrator deletes the IP-MAC binding entry from
the DHCP server which will help DHCP clients/DHCP Snooping switches to
quickly re-initialize their state machines and can be in sync with
DHCP server database without any delay.

Thanks,
Girish



On Fri, Oct 9, 2009 at 10:40 AM, pavan_kurapati
<pavan_kurapati at infosys.com> wrote:
> 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
>> > _______________________________________________
>> > dhcwg mailing list
>> > dhcwg at ietf.org
>> > https://www.ietf.org/mailman/listinfo/dhcwg
>> >
>> > ________________________________
>> > Keep up with people you care about with Yahoo! India Mail. Learn how.
>> _______________________________________________
>> dhcwg mailing list
>> dhcwg at ietf.org
>> https://www.ietf.org/mailman/listinfo/dhcwg
>
> **************** CAUTION - Disclaimer *****************
> This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely
> for the use of the addressee(s). If you are not the intended recipient, please
> notify the sender by e-mail and delete the original message. Further, you are not
> to copy, disclose, or distribute this e-mail or its contents to any other person and
> any such actions are unlawful. This e-mail may contain viruses. Infosys has taken
> every reasonable precaution to minimize this risk, but is not liable for any damage
> you may sustain as a result of any virus in this e-mail. You should carry out your
> own virus checks before opening the e-mail or attachment. Infosys reserves the
> right to monitor and review the content of all messages sent to or from this e-mail
> address. Messages sent to or from this e-mail address may be stored on the
> Infosys e-mail system.
> ***INFOSYS******** End of Disclaimer ********INFOSYS***
>