Re: doubt about lease...

[Rajesh Saluja <[e-mail]>]

> 
> >I have a small doubt about the lease given by the DHCP server. Suppose
> > initially 
> >a client gets a lease of 10 hours ( lease requested by the client ) from a 
> >DHCP server. Now if the client again sends a DHCPDISCOVER (to the same server)
> >before the lease expires ( say after 2 hours ), what lease will be offered by 
> >the server? Will it be the remaining lease (in this case, 8 hours) for the 
> >same address ot it will again be 10 hours from the current time? 
> 
> It depends on the server implementation.  I think most servers will grant
> a full ten hour lease, but they're under no obligation to do so.  Some
> may provide an eight hour lease; others may allow some more sophisticated
> means of setting policy, so that it's up to the administrator configuring
> the server to decide how to handle this case (i.e., is it a "one-shot"
> lease, or one that can be extended at any time?).
> 
> The amount of lease time a server provides is a policy issue, not a
> protocol one, and as such is not covered by the DHCP spec.
> 
> -Shawn Mamros

With reference to my question above, Can you please explain the following
lines taken from the page number 27 (section 4.3.1) of dhcp draft 06.txt :

   The server must also choose an expiration time for the lease, as
              ^^^^
   follows:

   o IF the client has not requested a specific lease in the
     DHCPDISCOVER message and the client already has an assigned network
     address, the server returns the lease expiration time previously
                                                           ^^^^^^^^^^
     assigned to that address (note that the client must explicitly
     ^^^^^^^^^^^^^^^^^^^^^^^^
     request a specific lease to extend the expiration time on a
     previously assigned address), ELSE
     ...........
     ........... 

            From this text, it appears that the server must return the
     remaining lease for the assigned IP address. 
     Please correct me if I am wrong. Thanks!! 

Best Regards
Rajesh Saluja