ncat v7.6 UDP -k and -w not working as expected

At work ( BSD nc version ) and on many internet examples ncat can listen to udp and be used with the following options : 1. -k which allows multiple connections 2. -w 0 which terminates the current connection when the client disconnects At home I have the following Command : Ncat: Version 7.60 ( https://nmap.org/ncat ) OS : Fedora 27 I am unable to use either -k or -w 0. ncat -klu localhost 8000 Ncat: UDP mode does not support the -k or --keep-open options, except with --exec or --sh-exec. QUITTING. nc -luw 0 localhost 8000 Ncat: Invalid -w timeout (must be greater than 0). QUITTING. How do I do the keep alive and the instant timeout in my version of ncat? ( man page does not help ) Thanks