@george1421 @jloke

Here’s a DHCP class example I just made up to match the example I posted below.

class "Legacy-Specific" { match if substring(option vendor-class-identifier, 0, 32) = "PXEClient:Arch:00000:UNDI:002001"; filename "undionly.kkpxe"; }

Of course, the ending bits will be different for others, and you’d want to set this class above the other legacy class so that this matches first and the more generic one matches second, then you’d set the filename you want.