PROLiNK MH8241 - Manual (Page 61)

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ROUNTING TABLE – STATIC ROUTING
Router Mode
Basic NAT mode:
Similar to Gateway mode, the difference is that Basic NAT mode only has
Basic NAT function. Once you select Basic NAT mode, all the additional
function such as DoD (Dial on Demand), IP Filter, DoS and so on will be
disabled. You may select Basic NAT mode to obtain higher speed otherwise
you have to select Gateway mode to enable these functions.