Настройка DHCP - option 66

option 66 tftpboot VoIP Phone

 yum install dhcp

DHCP использует файл конфигурации /etc/dhcp/dhcpd.conf

option tftp120 code 120 = string;
option tftp66 code 66 = string;
DHCPARGS=eth0;
subnet 192.168.1.0 netmask 255.255.255.0
{
option routers                  192.168.1.1;
option subnet-mask              255.255.255.0;
option domain-name-servers      192.168.3.237;
option tftp120                  "192.168.1.253";
option tftp66                   "192.168.1.253";
range 192.168.1.50 192.168.1.150;
}

DHCP также использует файл /var/lib/dhcpd/dhcpd.leases для хранения аренды клиентов.

lease 192.168.1.54 {
  starts 1 2015/07/06 08:21:57;
  ends 1 2015/07/06 20:21:57;
  cltt 1 2015/07/06 08:21:57;
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 00:26:8b:04:9b:8c;
  uid "\001\000&\213\003\233\214";
}
lease 192.168.1.55 {
  starts 1 2015/07/06 08:44:48;
  ends 1 2015/07/06 20:22:48;
  cltt 1 2015/07/06 08:22:48;
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 00:26:8b:01:97:0b;
  uid "\001\000&\213\001\227\013";

cat /var/lib/dhcpd/dhcpd.leases | grep -B 7 -C 1 ac:70

# cat /var/lib/dhcpd/dhcpd.leases | grep -B 7 -C 1  ac:70
lease 192.168.102.142 {
  starts 2 2015/07/14 11:09:30;
  ends 2 2015/07/14 23:09:30;
  cltt 2 2015/07/14 11:09:30;
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 00:26:8b:02:ac:70;
  uid "\001\000&\213\002\254p"

<spoiler>

option tftp66 code 66 = string;
subnet 192.168.1.0 netmask 255.255.255.0 {
        option tftp66 "192.168.1.11"
        option routers                  192.168.1.253;
        option subnet-mask              255.255.255.0;

        option domain-name              "example.com";
        option domain-name-servers       192.168.1.1;

        option time-offset               ;

	range 192.168.1.10 192.168.1.100;
        next-server 192.168.1.11
}

</spoiler>

delete the temporary file dhcpd.leases~:

 rm dhcpd.leases~

flush the lease cache dhcpd.leases:

 echo "" > dhcpd.leases

Система