The following is an example of the udpstat.d script, Here we run udpstat for a few seconds. Firstly, we run a "spray" command outbound, followed by a spray inbound. Both can be identified in the output below, # udpstat.d UDP_out UDP_outErr UDP_in UDP_inErr UDP_noPort 0 0 0 0 1 0 0 0 0 2 0 0 0 0 0 1165 0 2 0 0 0 0 0 0 0 0 0 0 0 2 3 0 1166 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ^C Here we run udpstat.d while an outbound DNS lookup is performed using "nslookup", # udpstat.d UDP_out UDP_outErr UDP_in UDP_inErr UDP_noPort 0 0 0 0 1 0 0 0 0 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 3 ^C Little output is observed as this tracks datagrams not bytes. There is one outbound and one inbound datagram.