ZyXEL Communications ZYWALL USG ZLD 2.21 Support Notes page 75

Edit the default policy. Limit its bandwidth to 100kbps for both inbound and
outbound traffic. Assign the lowest priority —7 for it.
c. IT staff can log all Thunder traffic by checking the Log check box and
blocking the Thunder packets by selecting Drop Packet in the Action field.
Also remember to check the Active check box to activate the signatures.
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– ZyWALL USG Support Notes
75