[Settings]
NAKMessage="Info text for DHCPNAK" ; Default: -

Since V2.2.1 NAKMessage allows to specify an info text that is added to DHCPNAK replies as option 56. This info text is visible in some DHCP clients. It is very rarely used and should usually be omitted. Default behavior if NAKMessage is not specified is to not add option 56 in the reply.