QNX下是pfctl，linux下是iptables

        http://www.qnx.com/developers/docs/7.0.0/#com.qnx.doc.neutrino.utilities/topic/p/pfctl.htmlhttp://www.qnx.com/developers/docs/7.0.0/#com.qnx.doc.neutrino.utilities/topic/p/pfctl.html