MAC address change

[Sten Carlsen]

You still have the mistake to have a fixed address in a range. Declare
subnet 1.1.1.0 with no range statement. There is a risk that an unknown
client will be given the 1.1.1.2 address when it is defined as a range.

On 25/11/11 16:17, Jan Markus wrote:
> Dne 11/24/2011 05:10 PM, Simon Hobson napsal(a):
>> Jan Markus wrote:
>>
>>> host customer101public {
>>> hardware ethernet 00:11:22:33:44:55;
>>> fixed-address 1.1.1.2;
>>> }
>>>
>>> shared-network vlan101 {
>>> subnet 10.0.0.0 netmask 255.255.255.248 {
>>> range 10.0.0.2 10.0.0.6;
>>> option routers 10.0.0.1;
>>> }
>>>
>>> subnet 1.1.1.0 netmask 255.255.255.252 {
>>> range 1.1.1.2;
>>> option routers 1.1.1.1;
>>> }
>>> }
>>>
>>> Everything works all right. Now the customer wants to purchase a new
>>> server and he wants me to
>>> remove public IP from his old server, until he will send me MAC
>>> address of the new one. So I just
>>> changed MAC in the "host" declaration, restarted DHCP daemon (even
>>> removed leases file).
>>>
>>> But the old server is still "getting" the public IP address, or it
>>> is "keeping" it. How can I
>>> specify in the dhcpd.conf, that this IP is no more for him, so he
>>> will lease address from the
>>> 10.0.0.0/29 pool?
>>
>> Your config is wrong - you have made a VERY common mistake. You
>> should NEVER have an address which
>> is both in a pool and in a fixed address statement. Because the
>> address is included in a pool it can
>> be leased to any device - including the one you want to exclude.
>>
>> First step would be to remove the range statement as it isn't needed
>> and is more likely to cause you
>> problems.
>>
>> Doing that will be sufficient to prevent the server leasing that
>> address.
>>
>> If you need to specifically prevent a device getting an address from
>> a pool, you can add "deny
>> booting" :
>>
>> host old-customer101public {
>> hardware ethernet 00:11:22:33:44:55;
>> deny booting;
>> }
>>
>
> Thank you very much! That was it. I have finaly changed configuration
> to this:
>
> host customer101public {
>   hardware ethernet 00:11:22:33:44:55;
>   fixed-address 1.1.1.2;
> }
>
> shared-network vlan101 {
>   subnet 10.0.0.0 netmask 255.255.255.248 {
>     option routers 10.0.0.1;
>     pool {
>       range 10.0.0.2 10.0.0.6;
>       deny known-clients;
>     }
>   }
>
>   subnet 1.1.1.0 netmask 255.255.255.252 {
>     option routers 1.1.1.1;
>   }
> }
>
>
> -Jan
> _______________________________________________
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-- 
Best regards

Sten Carlsen

No improvements come from shouting:

       "MALE BOVINE MANURE!!!" 

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