Yes but if the firewall or router is simply dropping the packets (common
with filter-based rules) then all UDP ports will show up as open, when in
fact they are not.
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On Wed, 9 Feb 2000, Darren Reed wrote:
It maybe worthwhile putting in a note when doing UDP scan that the
"open ports" are generated when no packets are received back. Too
many lay people seem to assume that "all UDP ports open" as reported
by nmap is a `bad thing' when in fact it's a good thing(tm).