topic dhcpd.conf in IP Telephony and Phones

dhcpd.conf

premavardhan — Sat, 16 Mar 2019 14:05:35 GMT

Hi Friends,

I have a problem in dhcpd.conf file. If i enable the option for TFTP server as 150. The dhcp server is not starting and showing [FAILED].

But if i remove or comment that line then it will work goog, showing [OK].

Actually my work is to configure Cisco IP Phone 7960. When the phone powered on it will ask DHCP server to assign an IP address. As a result the DHCP server assigns an ip address let it be 192.168.1.4. The DHCP servers ip address is 192.168.1.162.

Now i am trying to run tftp server in the same machine 192.168.1.162. But i am unable to enable this tftpserver address in dhcpd.conf file.

Can any on help me to solve this problem.

Regards,

PVR.

dhcpd.conf

Aaron Harrison — Tue, 20 Sep 2011 13:40:23 GMT

Two things:

- You only need to post your question once

- If you have a problem with the config file, maybe post up the config file that stops your server from working

Aaron

dhcpd.conf

premavardhan — Tue, 20 Sep 2011 14:02:38 GMT

Hi Aaron,

I have updated my discussion. Please find the attachment, it contains the config file that i am using.

Regards,

PVR

dhcpd.conf

Aaron Harrison — Tue, 20 Sep 2011 15:27:54 GMT

I'm no expert on linux/dhcpd but a quick google suggests it is failing because you have your custom option defined {inside} a subnet declaration, like so:

DHCPARGS=eth0;
subnet 192.168.1.0 netmask 255.255.255.0 {

range 192.168.1.2 192.168.1.10;

default-lease-time 86400;
max-lease-time 86400;

option ip-forwarding off;

  option broadcast-address 192.168.1.255;
  option subnet-mask 255.255.255.0;
 
option voip-tftp-server code 150 = ip-address;
option voip-tftp-server 192.168.1.162;
}

I suspect you should have the line shown in bold outside the subnet definition:

option voip-tftp-server code 150 = ip-address;

DHCPARGS=eth0;
subnet 192.168.1.0 netmask 255.255.255.0 {
  range 192.168.1.2 192.168.1.10;

    default-lease-time 86400;
    max-lease-time 86400;

  option ip-forwarding off; 
  option broadcast-address 192.168.1.255;
  option subnet-mask 255.255.255.0;
 
option voip-tftp-server 192.168.1.162;
}

If that doesn't work, maybe try defining the option as a String:

option voip-tftp-server code 150 = string;

DHCPARGS=eth0;
subnet 192.168.1.0 netmask 255.255.255.0 {
  range 192.168.1.2 192.168.1.10;

    default-lease-time 86400;
    max-lease-time 86400;

  option ip-forwarding off; 
  option broadcast-address 192.168.1.255;
  option subnet-mask 255.255.255.0;
option voip-tftp-server "192.168.1.162";
}

Regards

Aaron

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