D-Link DFL-CPG310 Product Manual - Page 246
Table 39: Packet Sanity Fields, Block., None., True., False.
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Using SmartDefense Table 39: Packet Sanity Fields In this field... Do this... Action Track Disable relaxed UDP length verification Specify what action to take when a packet fails a sanity test, by selecting one of the following: • Block. Block the packet. This is the default. • None. No action. Specify whether to issue logs for packets that fail the packet sanity tests, by selecting one of the following: • Log. Issue logs. This is the default. • None. Do not issue logs. The UDP length verification sanity check measures the UDP header length and compares it to the UDP header length specified in the UDP header. If the two values differ, the packet may be corrupted. However, since different applications may measure UDP header length differently, the NetDefend firewall relaxes the UDP length verification sanity check by default, performing the check but not dropping offending packets. This is called relaxed UDP length verification. Specify whether the NetDefend firewall should relax the UDP length verification sanity check or not, by selecting one of the following: • True. Disable relaxed UDP length verification. The NetDefend firewall will drop packets that fail the UDP length verification check. • False. Do not disable relaxed UDP length verification. The NetDefend firewall will not drop packets that fail the UDP length verification check. This is the default. 230 D-Link NetDefend firewall User Guide
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