On 10/07/14 16:43, Angelo Moreschini wrote:
> I made it.
> The optut was:
>   option dhcp-server-identifier 10.0.0.138;
>   option dhcp-server-identifier 10.0.0.138;
>   option dhcp-server-identifier 10.0.0.138;
>   option dhcp-server-identifier 10.0.0.138;
>   option dhcp-server-identifier 10.0.0.138;
>   option dhcp-server-identifier 10.0.0.138;
>   option dhcp-server-identifier 10.0.0.138;
>   option dhcp-server-identifier 10.0.0.138;
>   option dhcp-server-identifier 10.0.0.138;
>   option dhcp-server-identifier 10.0.0.138;
>
> they look to be the same...
> however, are not able to interpret this value ...

10.0.0.138 is the IP address of the server providing your system with configuration information.

Dave Ihnat had brought up the prospect that there could have been 2 DHCP servers to explain the changes in your system's address.  But, as you can see, there is only one....

And......

>
> ------------------------
> here I write two complete records (the last two):
>
> lease {
>   interface "em0";
>   fixed-address 10.0.0.1;
>   option subnet-mask 255.255.255.0;
>   option routers 10.0.0.138;
>   option dhcp-lease-time 3600;
>   option dhcp-message-type 5;
>   option domain-name-servers 10.0.0.138;
>   option dhcp-server-identifier 10.0.0.138;
>   option domain-name "Home";
>   renew 2 2014/10/07 08:05:32;
>   rebind 2 2014/10/07 08:29:41;
>   expire 2 2014/10/07 08:37:11;
> }
> lease {
>   interface "em0";
>   fixed-address 10.0.0.3;
>   option subnet-mask 255.255.255.0;
>   option routers 10.0.0.138;
>   option dhcp-lease-time 3600;
>   option dhcp-message-type 5;
>   option domain-name-servers 10.0.0.138;
>   option dhcp-server-identifier 10.0.0.138;
>   option domain-name "Home";
>   renew 2 2014/10/07 08:34:07;
>   rebind 2 2014/10/07 08:58:03;
>   expire 2 2014/10/07 09:05:33;
> }
>
>
> what it mean ?
>

You can see that the server at 10.0.0.138 has provided you with 2 different IP addresses a different times.  10.0.0.1 and 10.0.0.3 (fixed-address).

There is no problem with your system.  And, there is no problem with the DHCP server.  It just seems to be the policy of the entity responsible for the DHCP server not to maintain the same IP address.

You can contact the person responsible for the DHCP server to see if they can, or will, assign you a fixed IP address.  If that is not possible, you may have to use a Dynamic DNS service.

--
If you can't laugh at yourself, others will gladly oblige.

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