PXE only with dhcpd

yaplej · 01-23-2011, 01:56 AM

Hi there,

I am trying to setup a PXE server so it will only respond to PXE requests for the bootfile and tftp server. I really dont even care about the subnet it replies to because I have another dhcp server that provides the IP addresses. I tried the following but it does not work.

Will dhcpd do this? If not what other option is there that will only reply to the PXE request with the filename and server?

Code:

# global settings
## POF allow booting;
allow bootp;
default-lease-time 600;
max-lease-time 7200;

subnet 192.168.1.0 netmask 255.255.255.0 {
  next-server 192.168.1.126;
  filename "pxelinux.0";
  #option subnet-mask 255.255.255.0;
  #range 192.168.1.21 192.168.1.26;
  #option domain-name-servers  192.168.1.1;
  #option routers 192.168.1.1;
}

rayfordj · 01-23-2011, 09:03 AM

If you have to dhcp servers servicing the same network segment you'll need to ensure that the non-PXE one does not service PXEClient requests. And possibly a few other things to have them play nice together...

You'll probably want to configure a class and then a pool to respond to PXEClient requests and deny/ignore all other requests.

Code:

...
allow booting;
allow bootp;
class "pxeclients" {
   match if substring(option vendor-class-identifier, 0, 9) = "PXEClient";
   next-server 192.168.1.126;
   filename "pxelinux.0";
}

...

pool {
   allow members of "pxeclients";
   range 192.168.1.100 192.168.1.125;
   }

...

Easier might be to use the already existing DHCP server and add the above in some variation that works within your environment.