Issue regarding nmap-payloads - UDP services still showing as "open|filtered" when a payload is added to evoke a reply

Hi,

I've seen a few threads/bits of info regarding the nmap-payloads file but I
am having issues with adding custom payloads. I know that the open|filtered
outcome is given when no response (ICMP or UDP) has been received.

I added a custom payload within this file and using a network sniffer - I
can see that Nmap correctly sends the payload and also that, I get a
response back - yet Nmap still determines that it is "open|filtered.

I was wondering what modification I would need to make to ensure that Nmap
reports the status of the service as "open" - I have tried using Nmap with
the --datadir option but this has made no difference.

Does Nmap need to be re-compiled with the new payload? Or something else?

Thanks for your time,

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