D-Link DFL-800-AV-12 User Manual - Page 307
TCP Level Settings, ValidateLogBad, bytes, DropLog, Adjust, Enabled
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13.2. TCP Level Settings Chapter 13. Advanced Settings 13.2. TCP Level Settings TCPOptionSizes Verifies the size of TCP options. This function acts in the same way as IPOptionSizes described above. Default: ValidateLogBad TCPMSSMin Determines the minimum permissible size of the TCP MSS. Packets containing maximum segment sizes below this limit are handled according to the next setting. Default: 100 bytes TCPMSSOnLow Determines the action taken on packets whose TCP MSS option falls below the stipulated TCPMSSMin value. Values that are too low could cause problems in poorly written TCP stacks. Default: DropLog TCPMSSMax Determines the maximum permissible TCP MSS size. Packets containing maximum segment sizes exceeding this limit are handled according to the next setting. Default: 1460 bytes TCPMSSVPNMax As is the case with TCPMSSMax, this is the highest Maximum Segment Size allowed. However, this setting only controls MSS in VPN connections. This way, NetDefendOS can reduce the effective segment size used by TCP in all VPN connections. This reduces TCP fragmentation in the VPN connection even if hosts do not know how to perform MTU discovery. Default: 1400 bytes TCPMSSOnHigh Determines the action taken on packets whose TCP MSS option exceeds the stipulated TCPMSSMax value. Values that are too high could cause problems in poorly written TCP stacks or give rise to large quantities of fragmented packets, which will adversely affect performance. Default: Adjust TCPMSSAutoClamping Automatically clamp TCP MSS according to MTU of involved intafaces, in addition to TCPMSSMax. Default: Enabled TCPMSSLogLevel Determines when to log regarding too high TCP MSS, if not logged by TCPMSSOnHigh. 307