PPTP Commands

pptp	debug			PPTP debug is Off
pptp	dial		<rn-name>
pptp	drop		<rn-name>
pptp	tunnel		<tunnel id>
pptp	window			PPTP data rx-window-size = 16
pptp	rxTimeout			PPTP data rx-timeout = 200(ms)
pptp	queue			PPTP data tx-queue-size = 8

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