kalyan Alle kalyan.alle at gmail.com
Thu Mar 18 14:39:47 UTC 2010

thanks for the reply simon. Can u point me to the location of the
documentation where it is given in the ISC dhcp package.

kalyan alle

On Thu, Mar 18, 2010 at 7:04 PM, Simon Hobson <dhcp1 at thehobsons.co.uk>wrote:

> kalyan Alle wrote:
>  I was investigating a bug in dhcp 4.1.0 on my setup where the DHCP client
>> on the windows machine does not receive the DHCPNAK from the server
>  I have set some start and end range of ipaddresses for the dhcp client to
>> get the ip address. After the client got the ipaddress successfully i have
>> changed the start and end range of ipaddresses to some thing new. I did not
>> receive any DHCPNAK after half of the lease time is over since these pool or
>> range of ip's are different to the previous pool the ISC DHCP server should
>> send DHCPNAK to the client.
> It's not a bug, it's documented (I think) operation.
> Just because you've taken that address out of a range does not make the IP
> address itself invalid for the subnet - therefore the server will simply
> ignore the client and will NOT send a DHCP NAK. As long as the client asks
> to renew an IP address the server cannot hand out, the server will ignore
> it. There may well be another server handing out those addresses - which is
> valid.
> The server will however send a DHCP NAK if the IP address is not valid for
> the network.
> If you want the server to explicitly DHCP-NAK an address then you need to
> tell it to do so :
> pool {
>  range a.b.c.d a.b.c.e ;
>  deny booting ;
> }
> --
> Simon Hobson
> WANTED: "Software CD ROM Kit" for Canon CLBP 360-PS printer (Canon part no
> RH6-3612, or possibly RH6-3810, or RH6-3610 might do). I've a dead HD and
> need this CD so I can replace the disk and re-install the printer OS on it.
> This is NOT the same thing as the printer drivers to load on the computer -
> there's no problem there.
> If anyone knows where I might get hold of one I'd be grateful - requests to
> Canon drew a blank, it's been out of support for years.
> Alternatively, if anyone has one of these and would let me image their hard
> disk ...
> Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
> author Gladys Hobson. Novels - poetry - short stories - ideal as
> Christmas stocking fillers. Some available as e-books.
> _______________________________________________
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