Change dhcp server IP address

[- Kone Bakenon -]

>
>>Date: Mon, 19 Feb 2007 08:53:49 +0000
>>To: dhcp-users at isc.org
>>From: Simon Hobson <dhcp1 at thehobsons.co.uk>
>>Subject: Re: Change dhcp server IP address
>>
>>Kone Bakenon - wrote:
>>>  > Kone Bakenon - wrote:
>>>>
>>>>>   > Can you post your config and a description of the network ?
>>>>
>>>>>Here you have my dhcpd.conf
>>>>>subnet 172.16.0.0 netmask 255.255.240.0
>>>>>{
>>>>>	range 172.16.1.1 172.16.15.254;
>>>>>	option subnet-mask 255.255.240.0;
>>>>>	option routers 172.16.0.1;
>>>>>	option broadcast-address 172.16.15.255;
>>>>>	option domaine-name "mydomain.bf";
>>>>>	option domaine-name-servers 206.82.130.195;
>>>>>	default lease-time 3600;
>>>>>	max-lease-time 7200;
>>>>>}
>>>>>
>>>>>subnet 172.16.16.0 netmask 255.255.240.0
>>>>>{
>>>>>	range 172.16.16.2 172.16.31.254;
>>>>>	option subnet-mask 255.255.240.0;
>>>>>	option routers 172.16.16.1;
>>>>>	option broadcast-address 172.16.31.255;
>>>>>	option domaine-name "mydomain.bf";
>>>>>	option domaine-name-servers 206.82.130.195;
>>>>>	default lease-time 3600;
>>>>>	max-lease-time 7200;
>>>>>}
>>>>
>>>>  That looks fairly normal, but you still haven't described the
>>>>  network, or explained what exactly isn't working.
>>>>
>>>>
>>>
>>>My network is subnetted in Vlan 3 and Vlan 4. The first time when a
>>>computer is on Vlan 3 or 4, it takes a good parameters but if the same
>>>computer is moved to another Vlan, all the parameters changes but only
>>> the
>>>IP address of dhcp server is the same.
>>>The IP address for dhcp server should be 172.16.0.1 on Vlan 3 and
>>>172.16.16.1 on Vlan 4.
>>>From Vlan 3 to Vlan 4, the IP address and the dhcp server address for
>>> the
>>>host computer should change but they don't.
>>>I think to be clear now.
>>
>>No - it's still not clear as you have not adequately described your
>> network.
>>
>>I'm *guessing* that you don't have any routing between the VLANs, so
>>a client with (say) 172.16.16.123 can't communicate with the DHCP
>>server at 172.16.0.1.
>>
>>If that is the case, then your network is broken and you should
>>really be looking at fixing that.
>>
>>I'm also *guessing* that the server is connected to both VLANs (is it
>>the router ?). If so then you can probably work around the problem by
>>setting the server-identifier option to give out the required server
>>IP address in each subnet.
>>
>> From man dhcpd.conf :
>>
>>           The server-identifier statement
>>
>>             server-identifier hostname;
>>
>
> Maybe also need to add authoritative; to the global scope. See the
> dhcpd.conf man page for why you might want to do this.

My problem seems to be resolved. I comment line shared-network in dhcp
config file and everything run as I expected.
Thanks very much for your helps.
--------------
Kone Bakenon
>
> regards,
> -glenn
>