ZyXEL Communications P-334WT Support Notes page 136

Rule 2-Source port number 137, Destination port number 53 with protocol number 17 (UDP)
After the first filter set is finished, you will get the complete rules summary as below.
TCP Estab= No
More= No
Action Matched= Drop
Action Not Matched= Check Next Rule
Press ENTER to Confirm or ESC to Cancel:
Menu 21.2.2 - TCP/IP Filter Rule
Filter #: 2,2
Filter Type= TCP/IP Filter Rule
Active= Yes
IP Protocol= 17
Destination: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 53
Port # Comp= Equal
Source: IP Addr= 0.0.0.0
IP Mask= 0.0.0.0
Port #= 137
Port # Comp= Equal
TCP Estab= N/A
More= No
Action Matched= Drop
Action Not Matched= Forward
Press ENTER to Confirm or ESC to Cancel:
Log= None
IP Source Route= No
Log= None