one ethernet get more than one ip address

[Julie Xu]

Simon
 
Great thanks for the reply. 
 
The problem is on wireless, there is no server or some special machine involved. most are apple or window laptop.
 
Below machine on leases entries are only one ip, but actually it hold three ips, and all them actived at the time I check. I do not have history record of dhcpd.leases, I guess, current lease is 10.1.111.138, the rest two are from previous dhcp lease. for I understand, the machine should give away the rest two addresses when it get 10.1.111.138, but the machne keep three of them, and all of them actived. 
 
current three ip online stil, this is information on routerl:
   
Internet  10.1.111.138         0   0021.e98a.777b  ARPA   V111
Internet  10.1.111.83         16   0021.e98a.777b  ARPA   V111
Internet  10.1.111.64          1   0021.e98a.777b  ARPA   V111
 
 
the related dhcpd.leases records are:
 
   3878 lease 10.1.111.83 {
   3879   starts 5 2012/05/11 00:10:11;
   3880   ends 5 2012/05/11 00:12:11;
   3881   tstp 4 2012/05/10 06:38:45;
   3882   tsfp 4 2012/05/10 06:43:45;
   3883   atsfp 4 2012/05/10 06:43:45;
   3884   cltt 5 2012/05/11 00:10:11;
   3885   binding state free;
   3886   hardware ethernet 00:21:e9:8a:77:7b;
   3887   uid "\001\000!\351\212w{";
   3888   client-hostname "host";
   3889 }
   8404 lease 10.1.111.138 {
   8405   starts 5 2012/05/11 00:10:13;
   8406   ends 5 2012/05/11 00:20:13;
   8407   tstp 4 2012/05/10 07:47:41;
   8408   tsfp 5 2012/05/11 00:25:13;
   8409   atsfp 5 2012/05/11 00:25:13;
   8410   cltt 5 2012/05/11 00:10:13;
   8411   binding state active;
   8412   next binding state expired;
   8413   hardware ethernet 00:21:e9:8a:77:7b;
   8414   uid "\001\000!\351\212w{";
 
           ....... a lot of semilar record there
 
 
Please advcie
 
 
xll 
 
> Message: 4
> Date: Thu, 10 May 2012 17:07:19 +0100
> From: Simon Hobson <dhcp1 at thehobsons.co.uk>
> To: Users of ISC DHCP <dhcp-users at lists.isc.org>
> Subject: Re: one ethernet get more than one ip address
> Message-ID: <p0624082acbd196380b4e at simon.thehobsons.co.uk>
> Content-Type: text/plain; charset="us-ascii" ; format="flowed"
> 
> >I have found for some reason, one ethernet address may get more than
> >one ip address in my dynomic range, something like 2-6 ip addresses.
> 
> Can you show us a couple of lease file entries showing this ?
> 
> The usual reason is that the client, or multiple clients on one
> device, have used different Client IDs.
> 
> As an example of different clients, consider a machine that boots
> different OSs. It may boot with PXE (no client ID) and then into
> Windows (uses MAC address as Client ID). Or it may boot sometimes
> into Linux (no Client ID) and sometimes into Windows.
> 
> As an example of "same client", some versions of Windows
> automatically obtain themselves several addresses (used to be 10 in
> NT which was the last time I had to deal with it) "just in case" a
> remote access client should dial in. In the majority of cases there
> is no RAS being used, but the service used to be installed and
> started automatically. The machine would get an address for itself
> (using MAC address for Client ID), and several for clients (using
> multiple Client IDs starting with "RAS ").
> 
> The standards require that the Client ID be used as the primary key
> if one is supplied, and the MAC (Hardware) address is only used if no
> Client ID is present. This means that requests using different Client
> IDs are considered as different clients and so will obtain different
> addresses.
> 
> --
> Simon Hobson
> 
> 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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