traceroute trenger litt hjelp, men bruker fast formel:
# allow out the default range for traceroute(8): # "base+nhops*nqueries-1" (33434+64*3-1) pass out on $ext_if inet proto udp from any to any port 33433 >< 33626 keep state
Slike nyttige ting finner du i listearkiver- openbsd-misc (f. eks. http://marc.theaimsgroup.com/)
Note: Unix traceroute bruker normalt UDP; Microsoft bruker ICMP ECHO (som unix med -I)