D-Link DFL-260E User Manual for DFL-260E - Page 550
TCP Level Settings
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13.2. TCP Level Settings Chapter 13. Advanced Settings 13.2. TCP Level Settings TCP Option Sizes Verifies the size of TCP options. This function acts in the same way as IPOptionSizes described above. Default: ValidateLogBad TCP MSS Min 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 TCP MSS on Low 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 TCP MSS Max 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 TCP MSS VPN Max 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. This setting must be less than the maximum IPsec MTU size and the maximum IPsec MTU size must be less than the maximum packet size handled by the physical interface. Default: 1400 bytes TCP MSS On High 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 TCP MSS Log Level Determines when to log regarding too high TCP MSS, if not logged by TCPMSSOnHigh. 550