Use this procedure to set the maximum IPv6 ICMP length that DAPP uses.
From the navigation tree, double-click QoS.
From the QoS tree, double-click QoS Agent.
Select the Configuration tab.
Under the DoS Attack Prevention Package section, enter a value in the range 0 to 16383 in the DappIpv6IcmpMaxLength text box.
Click Apply.