Per doc/pxelinux.txt, the special PXELINUX filename specification of "IP address::filename" allows "IP address" to be a DNS recognizable name. If it contains no dots, the domain name (DHCP option 15) is supposed to be appended to qualify the name. Testing PXELINUX 3.86, this behavior does occur as I can see the DNS request having the specified domain name appended properly. Testing with PXELINUX 4.03, I notice that the domain name is not appended. I'm going to look into why this occurs. -- -Gene