IP addresses on local network change

[Angelo Moreschini]

thank you Ed, I learned many things from you. Actually I am a Linux
beginner   ....

Just another question, if I can, please:
it exists some fix relation between the "port number" of the servers  and
the theirs IP number ?

It is some kind of correlation between them ?

On Tue, Oct 7, 2014 at 1:40 PM, Ed Greshko <ed.greshko at greshko.com> wrote:

> 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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