different devices getting the same ip address

[dorian]

Hi all.
I have same problem and static leases are not a solution for me since
the dhcp server is used in hot-spot installation.

I have only 1 dhcp server offering IPs from 172.16.0.0/14 class (which
gives 262142 hosts/net)

Since I am registering (with another tools) all the IPs in the network I
know that there number of different IPs assigned (whenever) by DHCP
server is only 30924 which is significantly less than theoretically
possible 262142.

I have around 1000 users per day at the hotspot system. Some of them are
the same users some are 'accidental' ones.

The config lease times are following:
default-lease-time 86400;
max-lease-time 86400;
which means 24h

Since working hours of the hostpot are 8:00 - 22:00 and lease time is
24h and the number of users is ~1000/day  I do not understand why
sometimes a host obtains IP address being in use.

Any ideas?

BTW: the current dhcpd.leases file contains 503007 entries  (entries not
lines)!
Does it mean the file contains whole 'history' of the leases whenever
given? What for?


Full dhcpd.conf is following:

---------------------------------------------------------
ddns-update-style none;
log-facility local7;
lease-file-name "/var/log/dhcpd/dhcpd.leases";

#--------- 172.16.0.0/14----------------------------
subnet 172.16.0.0 netmask 255.252.0.0 {
   authoritative;
   option subnet-mask   255.252.0.0;
   option routers 172.16.0.1;
   option domain-name-servers 10.2.0.1;
   option interface-mtu 1450;

#   lease time = 24h
   default-lease-time 86400;
   max-lease-time 86400;
   range 172.16.8.0  172.19.255.254;
##-- 172.16.8.0     - all below are reserved for static addresses
}

host aaaaaaa1 {
      hardware ethernet XX:XX:XX:XX:XX:XX;
      fixed-address 172.16.0.2;
   }
host aaaaaaa2 {
      hardware ethernet XX:XX:XX:XX:XX:XX;
      fixed-address 172.16.0.3;
   }
host aaaaaaa3 {
      hardware ethernet XX:XX:XX:XX:XX:XX;
      fixed-address 172.16.0.4;
   }
host aaaaaaa4 {
      hardware ethernet XX:XX:XX:XX:XX:XX;
      fixed-address 172.16.0.5;
   }
host aaaaaaa5 {
      hardware ethernet XX:XX:XX:XX:XX:XX;
      fixed-address 172.16.0.6;
   }
host aaaaaaa6 {
      hardware ethernet XX:XX:XX:XX:XX:XX;
      fixed-address 172.16.0.7;
   }
host aaaaaaa7 {
      hardware ethernet XX:XX:XX:XX:XX:XX;
      fixed-address 172.16.0.8;
   }
host aaaaaaa8 {
      hardware ethernet XX:XX:XX:XX:XX:XX;
      fixed-address 172.16.0.9;
   }
host aaaaaaa9 {
      hardware ethernet XX:XX:XX:XX:XX:XX;
      fixed-address 172.16.0.10;
   }
host aaaaaaa10 {
      hardware ethernet XX:XX:XX:XX:XX:XX;
      fixed-address 172.16.0.11;
   }


Rgds,
Dorian.


Brad Bendily wrote:
> You could try to assign them static IPs via their MAC address.
> Hopefully you don't have too many of them.
>
> bb
>  
>
>   
>> -----Original Message-----
>> From: dhcp-users-bounces+brad.bendily=la.gov at lists.isc.org 
>> [mailto:dhcp-users-bounces+brad.bendily=la.gov at lists.isc.org] 
>> On Behalf Of Tom De Moor (VCLB Gent)
>> Sent: Wednesday, November 30, 2011 2:52 AM
>> To: dhcp-users at lists.isc.org
>> Subject: different devices getting the same ip address
>>
>>   Hi,
>> i m having the following problem:
>> multiple Samsung Galaxy* *Gio get the same ip from our dhcp-server.
>> How can i resolve this?
>>
>> Tom
>>
>> My dhcpd.conf is
>>
>> subnet 10.10.0.0 netmask 255.255.0.0 {
>> range 10.10.2.1 10.10.5.254;
>> option domain-name-servers 10.10.1.2;
>> option domain-name "vclbgent.be";
>> option routers 10.10.1.2;
>> default-lease-time 7200;
>> max-lease-time 7200;
>> deny duplicates;
>> }
>>
>>
>> In the leases file is see
>> lease 10.10.2.182 {
>>    starts 3 2011/11/30 08:02:04;
>>    ends 3 2011/11/30 08:36:54;
>>    tstp 3 2011/11/30 08:36:54;
>>    cltt 3 2011/11/30 08:02:04;
>>    binding state free;
>>    hardware ethernet 18:46:17:6d:dd:be;
>>    uid "\000K";
>> }
>>
>> lease 10.10.2.182 {
>>    starts 3 2011/11/30 08:41:04;
>>    ends 3 2011/11/30 10:41:04;
>>    cltt 3 2011/11/30 08:41:04;
>>    binding state active;
>>    next binding state free;
>>    hardware ethernet 18:46:17:6d:dd:3e;
>>    uid "\000K";
>> }
>>
>> In the logfiles i get
>> Nov 30 07:59:25 the-oracle dhcpd: client 18:46:17:6d:dd:52 
>> has duplicate leases on 10.10.0.0/16 Nov 30 08:53:21 
>> the-oracle dhcpd: client cc:f9:e8:12:76:50 has duplicate 
>> leases on 10.10.0.0/16 Nov 30 09:02:04 the-oracle dhcpd: uid 
>> lease 10.10.2.242 for client 18:46:17:6d:dd:be is duplicate 
>> on 10.10.0.0/16 Nov 30 09:36:54 the-oracle dhcpd: client 
>> cc:f9:e8:12:76:50 has duplicate leases on 10.10.0.0/16
>>
>>
>>
>>
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>> dhcp-users at lists.isc.org
>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>
>>     
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