isc-dhcp server

Samuel Motta samuel at apoiotatico.com.br
Fri Apr 24 20:52:00 UTC 2015


Hi everybody!

I´m using isc-dhcp-server version 4.2.2 on two servers (same version on
both servers and fail-over peers)
But , I´m having problems with the address that changes before expiration
time of the lease.
For example an android cell phone with the MAC Address f8:f1:b6:92:3d:e8
was with the IP 192.168.0.103 with the initial lease time 2015/03/23 and
end lease time 2015/04/22.

At 2015/03/25 the IP changed to 192.168.0.105  at both servers with initial
lease time 2015/03/25 and end lease time 2015/04/24.

It don´t happens everytime, but sometimes it happens and with different
clients.
My /mnt/dhcp/subnet file and /mnt/dhcp/hosts are available on both servers.
What´s wrong on my configuration files?

Follow my primary server dhcpd.conf

ddns-update-style none;
interfaces="eth0";
authoritative;
log-facility local7;
failover peer "dhcp-failover" {
        primary;
        address 192.168.0.3;
        port 647;
        peer address 192.168.0.2;
        peer port 648;
        max-response-delay 60;
        max-unacked-updates 10;
        load balance max seconds 3;
        mclt 3600;
        split 128;
}
include "/mnt/dhcp/subnet";
include "/mnt/dhcp/hosts";



and my secondary server dhcpd.conf

ddns-update-style none;
authoritative;
log-facility local7;
failover peer "dhcp-failover" {
        secondary;
        address 192.168.0.2;
        port 648;
        peer address 192.168.0.3;
        peer port 647;
        max-response-delay 60;
        max-unacked-updates 10;
        load balance max seconds 3;
}
include "/mnt/dhcp/subnet";
include "/mnt/dhcp/hosts";



here my /mnt/dhcp/subnet   file

subnet 192.168.0.0 netmask 255.255.255.0 {
  option domain-name-servers 192.168.0.4, 192.168.0.254, 192.168.0.253;
  option netbios-name-servers 192.168.0.4 ;
  option routers 192.168.0.254;
  option broadcast-address 192.168.0.255;
  pool {
        failover peer "dhcp-failover";
        default-lease-time 3888000;
        max-lease-time 3888000;
        range 192.168.0.11 192.168.0.200;
  }
}


here my /mnt/dhcp/hosts   file

host plasma-eth {
        hardware ethernet 00:e0:4b:24:e8:02;
        fixed-address 192.168.0.235;
}


My best regards,

Samuel Motta.
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