Multi IP assign for single MAC-Urgent

[Rudy Zijlstra]

Hi Arun,

the documentation of ISCP documents this very well.

I would suggest by starting to read "man dhcpd.conf". You will find 
referrals to other good pages in there as well

Cheers,


Rudy

On 01/03/2011 01:36 PM, arun.sasi1 at wipro.com wrote:
> Ho to implement below in my Ubuntu server.
>
> if { substring (client-id,1,4)="RAS "
>      ignore booting ;
> }
>
>
> -----Original Message-----
> From: dhcp-users-bounces+arun.sasi1=wipro.com at lists.isc.org
> [mailto:dhcp-users-bounces+arun.sasi1=wipro.com at lists.isc.org] On Behalf
> Of Simon Hobson
> Sent: Monday, January 03, 2011 6:02 PM
> To: Users of ISC DHCP
> Subject: Re: Multi IP assign for single MAC-Urgent
> Importance: High
>
> arun.sasi1 at wipro.com wrote:
>
>    
>> This is a multi IP assignment for single host with DHCP server.
>>
>> I have dhcp server running in Ubuntu platform. I have configured
>> DHCP with "range". There is no MAC binding or reserve concept.
>>
>> Here I can see in my Webmin and dhcpd.lease database multiple active
>> IP for single host.
>>
>> I compared the two active lease and found that client are populating
>> and registered with two different UID for single MAC.
>>
>> Please help me to resolve this issue.
>>      
> Did you try searching the archives at all - it's a common and well
> known problem.
>
>    
>> Logs
>> lease 163.183.39.238 {
>>    starts 3 2010/12/29 06:01:26;
>>    ends 4 2010/12/30 06:01:26;
>>    tstp 4 2010/12/30 06:01:26;
>>    cltt 3 2010/12/29 06:01:26;
>>    binding state active;
>>    next binding state free;
>>    hardware ethernet e0:cb:4e:24:8c:27;
>>    uid "\001\340\313N$\214'";
>>    client-hostname "MHAMZEHNAZ-IR16";
>> ------------------------
>>
>> lease 163.183.39.247 {
>>    starts 2 2010/12/28 04:32:34;
>>    ends 5 2010/12/31 04:32:34;
>>    tstp 5 2010/12/31 04:32:34;
>>    cltt 2 2010/12/28 04:32:34;
>>    binding state active;
>>    next binding state free;
>>    hardware ethernet e0:cb:4e:24:8c:27;
>>    uid "\001RAS \340\313N$\214'\000\000\000\000\000\000";
>>    client-hostname "MHAMZEHNAZ-IR16";
>>      
> The key bit here is the uid starting with ""\001RAS ", which suggests
> this is a Windows server with RAS (Remote Access Service) enabled.
> These servers will automatically obtain (IIRC) 10 addresses just in
> case a client should ever connect to it. If you aren't using RAS,
> then the easiest thing to do is to ignore such requests like this :
>
> if { substring (client-id,1,4)="RAS "
>      ignore booting ;
> }
>
> See also :
> https://lists.isc.org/mailman/htdig/dhcp-users/2006-March/000273.html
>