In my current network I have a pre-existing ISC-DHCP server running on an Ubuntu server. I chose to install FOG without DHCP enabled with the assumption that I would integrate it with my existing DHCP server. I couldn’t find specific information in regards to making the actual configuration changes to make this work. After searching through the documentation here and elsewhere I eventually came across the config file entries that made this possible in the man pages of dhcp.conf. This post is just a reference for others that might need the same information and are having a tough time locating it.

The two lines you need to add to your /etc/dhcp/dhcpd.conf file are as follows:

    next-server                 10.10.1.13; #Fog Server IP Address
    option bootfile-name        "undioonly.kpxe";

Example of a configuration file with these options added:

#internal LAN (eth2)
subnet 10.10.0.0 netmask 255.255.0.0 {
    range               10.10.224.0 10.10.255.254;
    option routers          10.10.0.10;
    option subnet-mask      255.255.0.0;
    option broadcast-address    10.10.255.255;
    option domain-name-servers  10.10.1.11, 10.10.1.12;
    option domain-name          "example.com";
    option tftp-server-name     "10.10.0.10";
    next-server                  10.10.1.13; #Fog Server IP Address
    option bootfile-name        "undioonly.kpxe";

    include "/etc/dhcp/lan.conf";
}

I eventually dug through the man pages of dhcp.conf and found the information I was needing. The redirect links to Red Hat’s documentation on DHCP from the FOG Wiki do not make any mentions of the next-server option. Hopefully this post will save others seeking the same information in the future a little time.

REFERENCES

DHCP.conf man page: http://linux.die.net/man/5/dhcpd.conf (do a quick search for “next-server” and it will take you directly to the relevant section of the document)