DHCP Server

endfx · 06-16-2008, 04:35 PM

I need to setup my dhcp server to respond to clients that have dhcp option 43 suboption 15 set to something particular (let's say "abcd").

Basically, the server gets a request from a client specifying "abcd" as option 43 sub-option 15, then I need to specify a particular tftp server in the response (or file)

Does anyone have experience with setting up dhcp server took look for this option? (vendor specific options is what they are referred to).

I'm using a standard ISC dhcp server.

Thanks.

vortmax · 06-17-2008, 01:57 PM

I'm not sure 100%, but I can at least point you in the right direction.

You can do it with classes. Define a class like:

Code:

class "SomeClass" {
        match if substring(option vendor-class-identifier,0,6) = "ABCD";
        option tftp-server-name "172.16.16.7";
        next-server 172.16.16.7;

}

that will tag all of those clients as being a particular class. I use classes to allow or disallow access to subnets. I've never assigned options based on class. You may be able to add the tftp options into the class definition, or you may have to build a group. I'm sure there is a simple way of doing it though.

edit: Just looked it up and you should be able to append normal options into the class statement. So that code above would take all computer matching ABCD as their vendor string and give assign 172.16.16.7 as the tftp address.