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

[girish gupta <[e-mail]>]

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
<[e-mail]> wrote:
> Girish,
> Check RFC 3203 for DHCP FORCERENEW message which you can use for the below scenario.
>
> Thanks,
> Pavan
>
>> -----Original Message-----
>> From: [e-mail] [mailto:[e-mail]] On Behalf
>> Of girish gupta
>> Sent: Friday, October 09, 2009 10:35 AM
>> To: [e-mail]; 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
>> <[e-mail]> 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 <[e-mail]>
>> > To: [e-mail]
>> > 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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>> > https://www.ietf.org/mailman/listinfo/dhcwg
>> >
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>
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