On my site we have multiple subnets. One DHCP and TFTP smarthost with multiple NICs serves on all subnets. In this setup there is a problem with getting the right tftp host for pxe boot.
I have setup my dhcpd.conf with next-server directives for each subnet. The problem is that foreman adds a superseed server.next-server statement to each DHCP host entry.
In my opinion the dhcp smart proxy could detect the correctly setup next-server directive in the config file and not include the superseed.
As a workaround I commented out the nextServer line in addRecord in foreman-proxy/modules/dhcp/providers/server/isc.rb