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if dhcpd.conf contain if statement for pxe then subnets are not detected
eg.:

option arch code 93 = unsigned integer 16;

if option arch = 00:06 {
    filename "pxelinux/bootia32.efi";
} else if option arch = 00:07 {
    filename "efi64/bootx64.efi";
} else {
    filename "pxelinux.0";
}

SUBNET_BLOCK_REGEX in modules/dhcp_isc/dhcp_isc_main.rb doesn't properly deal with {}