Draytek Vigor2110 Series User Manual page 141

please open Syslog. From Codepage Information of Setup
dialog, you will see the recommended codepage listed on the
dialog box.
Window size – It determines the size of TCP protocol
(0~65535). The more the value is, the better the performance
will be. However, if the network is not stable, small value
will be proper.
Session timeout – Setting timeout for sessions can make the
best utilization of network resources.
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Vigor2110 Series User's Guide