Multi IP assign for single MAC-Urgent
Simon Hobson
dhcp1 at thehobsons.co.uk
Mon Jan 3 12:32:08 UTC 2011
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
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
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