Please Urgent: Failover problem

[Abu Abdulla alhanbali]

I tried this option but it didn't seem to work correctly.
the dhcpd.conf now is (server IP 194.180.195.10):

$more /etc/dhcpd.conf
allow booting;
allow bootp;

ddns-update-style none;
authoritative;
log-facility local2;

subnet 194.180.195.0 netmask 255.255.255.224
{
}

subnet 172.18.140.0 netmask 255.255.255.0
{
  option routers 172.18.140.1;
  option subnet-mask 255.255.255.0;
  option broadcast-address 172.18.140.255;
  max-lease-time 10;
  default-lease-time 15;
  next-server 194.180.195.10;
  server-name "194.180.195.10";
  option root-path "194.180.195.10:/tftpboot";
  option tftp-server-name "194.180.195.10";
  filename "/tftpboot/pppoe.tlv";
  option bootfile-name "/tftpboot/pppoe.tlv";
  range 172.18.140.100 172.18.140.105;
}

On the other hand, I sniffed the traffic using ethereal and the DHCPOFFER
was:
.
.
Your (client) IP address: 172.18.140.100 (172.18.140.100)
Next server IP address: 194.180.194.10 (194.180.194.10)
Relay agent IP address: 172.18.140.2 (172.18.140.2)
Client MAC address:Integrit_09:ee:3f (00:10:6d:09:ee:3f)
server host name: 194.180.195.10
Boot file name /tftpboot/pppoe.tlv
Magic cookie: (OK)
Option 53: DHCP Message Type = DHCP offer
Option 54: Server Identifier = 194.180.195.10
Option 51: IP Address Lease Time = 10 seconds
Option 1: Subnet Mask = 255.255.255.0
Option 28: Broadcast Address = 172.18.140.255
Option 3: Router = 172.18.140.1
End Option
Padding


To know exactly what the output should be I have run Solaris DHCP and it
works fine and the output was the same with these additional options:

.
.
Option 17: Root Path = "/tftpboot"
Option 67: Bootfile name = "pppoe.vlt"
Option 66: TFTP Server Name = "194.180.195.10"
Option 31: Perform Router Discover = Enabled


So how can I add these options in ISC DHCP. The previous dhcpd.conf didn't
work with me. In addition where can I know the option number if I know the
option name.
Morever I want to use failover server, will this work since in failover I
should add "deny dynamic bootp clients".

Thanks in advance.