Hello All,

I've encountered an issue attempting to use Foreman 1.13.3 to Chainload pxelinux to iPXE using the undionly.kpxe file.

This is on Foreman 1.13.3 using RHEL 7.2. This means i am using RHEL 7.2's default dhcp (dhcpd-isc?) DHCP provider. I have followed the step(s) here: http://projects.theforeman.org/projects/foreman/wiki/Fetch_boot_files_via_http_instead_of_TFTP

So I pxe boot to pxelinux.0 successfully, and load undionly.kpxe successfully. Whereby I DHCP to foreman again and "should" be presented to connect to my Foreman unattend/IPXE file as the below logic is in my dhcpd.conf file (and I've restarted dhcpd and cleared my leases and regenerated by re-enabling "build" on the host.

1. PXE/iPXE Handoff.
2. The if statement below prevents infinite booting when using undionly.kpxe files
3. Normal PXE boots are unaffected
   next-server <%= @ipaddress_eth0 %>;
   if exists user-class and option user-class = "iPXE" {
   filename "https://obfuscatedURL:443/unattended/iPXE";
   } else {
   filename "pxelinux.0";
   }

This is not what happens, and i am boot looping infinitely.

I "think" the issue comes down to how foreman is creating a lease. Looking at a sample lease for the host in question from dhcpd.leases
Note: FQDN, next-server, and IP changed for privacy

host myhostname.labdomain.com {
dynamic;
hardware ethernet 00:50:56:95:5c:88;
fixed-address 172.111.111.112;
supersede server.filename = "pxelinux.0";
supersede server.next-server = aa:ab:cd:0e;
supersede host-name = "myhostname.labdomain.com";
}

I think the issue lies with the supersede server.filename line. As this will (i believe) override the logic present in the dhcpd.conf file.

Im unsure if this is a bug, or desired behavior, perhaps something with the specific configuration, or a missing line in a .yml file somewhere. I googled around for a bit and found few references to this. Has anyone else had this issue, or knows of a fix? Is this expected behavior in foreman? I feel like it isn't - and the dhcpd.conf should be driving the bootfile name per the Guide: http://projects.theforeman.org/projects/foreman/wiki/Fetch_boot_files_via_http_instead_of_TFTP but i definitely could be wrong.

I can provide additional info if needed - just let me know.!