Hi. I need to install old Centos 5.6 (some testing needed hence the old os). I cannot install the old os via USB (MBR) as I suspect BIOS has issue. The next best thing might be to install over the network. I checked online the os has Netboot iso. I have enabled TFTP server on my Qnap. Other than that, don't know what to do next. I'm not sure if TFTP also requires PXE boot service running to be able to install from network?
Since DHCP server is on my Sophos Firewall, I've found an instruction entitled "Sophos Firewall: Configure DHCP option 150 for VOIP," https://support.sophos.com/support/s/article/KB-000035918?language=en_US , I'm not sure if applicable.
If so, I followed the instructions so far, and hit a snag when it was asking for <dhcp lease scope>, I don't know what to put.
Help needed.
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