Hi, When I was monitoring TCP congestion window size on a FreeBSD machine, I always found TCP cuts the window size to 1 by TCP quence message although there is no packet missing(from tcpdump trace). My configuration is two machine on the same Lan but the BSD machine with dummyNet restrict it BW, I am so anoyed by this quench thing... Can anybody kindly give some suggestion on what it is and how the cause of it. Thanks, -Haijin - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html