This is not supported by KACE Technical Support and this solution is reported to resolve PXE booting in an environment involving IBM iSeries DHCP servers.
Summary: I have set Option 66 to the IP Address of the K2000 and Option 67 to k2000.0. Despite this, the target machines will not pxe boot to the K2000.
Solution: Bootstrap Server Setting needs to be specified.
1. Go to DHCP Server Configuration and click "Global"
2. Go to Other tab and input the IP address of your K2000 appliance
3. Click Okay