D-Link DFL-860E CLI Guide for DFL-260E - Page 189
TCP NULL packets without SYN, ACK, FIN or
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3.52.23. VLANSettings Chapter 3. Configuration Reference TCPSynFin TCPFinUrg TCPUrg TCPECN TCPRF TCPNULL TCPSequenceNumbers TCPAllowReopen valid (strip=strip RST). (Default: DropLog) The TCP FIN flag together with SYN; normally invalid (strip=strip FIN). (Default: DropLog) The TCP URG flag together with FIN; normally invalid (strip=strip URG). (Default: DropLog) The TCP URG flag; many operating systems cannot handle this correctly. (Default: StripLog) The Explicit Congestion Notification (ECN) flags. Previously known as "XMAS"/"YMAS" flags. Also used in OS fingerprinting. (Default: StripLog) The TCP Reserved field: should be zero. Used in OS fingerprinting. Also part of ECN extension. (Default: StripLog) TCP "NULL" packets without SYN, ACK, FIN or RST; normally invalid, used by scanners. (Default: DropLog) Validation of TCP sequence numbers. (Default: ValidateLogBad) Allow clients to re-open TCP connections that are in the closed state. (Default: No) Note This object type does not have an identifier and is identified by the name of the type only. There can only be one instance of this type. 3.52.23. VLANSettings Description Settings for IEEE 802.1Q based Virtual LAN interfaces. Properties UnknownVLANTags VLAN packets tagged with an unknown ID. (Default: DropLog) Note This object type does not have an identifier and is identified by the name of the type only. There can only be one instance of this type. 189