Re: [dhcwg] DHCP_DECLINE question

[Ralph Droms <[e-mail]>]

I agree with Kim and Ted - DHCPDECLINE is defined in RFC2131 to be used in 
the case of an address conflict, and many DHCP servers will mark the 
address in a DHCPDECLINE so that it is not offered again in the future.

If the client decides that the address or other parameters in a DHCPACK are 
not acceptable, the client should respond with a DHCPRELEASE and then 
restart the address assignment process with a DHCPDISCOVER.

- Ralph

At 12:26 PM 2/28/2002 -0500, Kim Kinnear wrote:
>At 06:04 PM 2/27/2002, Burcak Beser wrote:
> >I have a question regarding the use of DHCP_DECLINE message. If the 
> client is choosing a valid DHCP_OFFER using contents of the returned 
> options, and the DHCP SERVER changes the contents of the options while 
> sending the DHCP_ACK message, is it acceptable for client to use 
> DHCP_DECLINE? (The RFC 2131 states that DHCP_DECLINE is issued when the 
> IP address in use.)
>
>         No, it is not. See below.
>
>
> >In other words when a DHCP_DECLINE is received by the DHCP SERVER does 
> this mean that the client detected that the IP address is already used by 
> another entity?
>
>         Yes, and the implication (as well as the explicit
>         direction) is that the DHCP server should not offer this
>         IP address to this client or any other client for at
>         least some time since it has been shown to be "unusable"
>         for DHCP client allocation (because some client (or
>         machine, maybe not a DHCP client) appears to be using it).
>
>         From RFC2131.txt:
>
>4.3.3 DHCPDECLINE message
>
>    If the server receives a DHCPDECLINE message, the client has
>    discovered through some other means that the suggested network
>    address is already in use.  The server MUST mark the network address
>    as not available and SHOULD notify the local system administrator of
>    a possible configuration problem.
>
>
>         If you don't like the IP address, you could use a
>         DHCPRELEASE to give it back.  Of course, you may in that
>         case be offered it next time, but you don't need to take
>         the offer.
>
>         If you just want to give it back, use DHCPRELEASE.
>
>         If you want to give it back and be offered a different IP
>         address from this server, that's a harder question, since
>         the DHCPDECLINE implies that the address isn't usable.
>
>         Cheers -- Kim
>
>
>
>
>
> >-burcak
> >
> >_______________________________________________
> >dhcwg mailing list
> >[e-mail]
> >https://www1.ietf.org/mailman/listinfo/dhcwg
>
>
>_______________________________________________
>dhcwg mailing list
>[e-mail]
>https://www1.ietf.org/mailman/listinfo/dhcwg


_______________________________________________
dhcwg mailing list
[e-mail]
https://www1.ietf.org/mailman/listinfo/dhcwg