D-Link DFL-CPG310 Product Manual - Page 248
IP Fragments, e handled.
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Using SmartDefense In this field... Do this... Max Ping Size Specify the maximum data size for ICMP echo response. The default value is 1500. IP Fragments When an IP packet is too big to be transported by a network link, it is split into several smaller IP packets and transmitted in fragments. To conceal a known attack or exploit, an attacker might imitate this common behavior and break the data section of a single packet into several fragmented packets. Without reassembling the fragments, it is not always possible to detect such an attack. Therefore, the NetDefend firewall always reassembles all the fragments of a given IP packet, before inspecting it to make sure there are no attacks or exploits in the packet. You can configure how fragmented packets should be handled. 232 D-Link NetDefend firewall User Guide
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