Difference between revisions of "Dhcp"

Revision as of 02:03, 2 September 2014

In order to provide option 150 (or other custom options) two configuration entries are required, first, in the top level of the configuration file located at /etc/dhcp/dhcpd.conf you need to define your custom option:

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

Then, in the subnet stanza for where you need to provide the information you'll configure the option with the appropriate value.

subnet 192.168.0.0 netmask 255.255.255.0 {
 [...]
 option voip-tftp-server 10.101.0.10;
}

If you place the option definition in the subnet stanza then dhcpd will not work.
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edited Mar 14 '13 at 18:58

answered Mar 14 '13 at 17:09
johnf
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It can be:

option tftp-servers code 150 = array of ip-address;

option tftp-servers 10.20.10.1, 10.20.11.1;
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http://www.redhat.com/archives/redhat-list/2004-December/msg00272.html

 Since I'm not able to reply to the archived posts from earlier this
year when people were asking how to do this, here is a quick config for
anyone doing a websearch now or in the future. This is an example of how
to use a linux dhcpd DHCP server to hand out ip address leases and
specify the TFTP option 150 for VoIP phones in the dhcpd.conf config
file.

# /etc/dhcpd.conf

ddns-update-style interim;
ignore client-updates;

# Define Custom Options
option option-150 code 150 = ip-address;

# Global Config

option ip-forwarding off;
option nis-domain               "domain.local";
option domain-name              "domain.local";
default-lease-time 21600;
max-lease-time 43200;

subnet 192.168.117.0 netmask 255.255.255.0 {

option routers 192.168.0.1; #

Default Gateway

option subnet-mask 255.255.255.0; option broadcast-address 192.168.0.255; option domain-name-servers 192.168.0.10; option nntp-server 192.168.0.10; option time-offset -18000; #

Eastern Standard Time

option option-150 192.168.200.10;

# TFTP Custom Option

next-server 192.168.200.10;

# TFTP Boot

range dynamic-bootp 192.168.0.200 192.168.0.249;

}