Are you passing through the internet, or is this internal? Its likely that there is a bandwidth management device in between if you dont have control of the entire path. Our ET/BWMGR (which runs on LINUX btw) for example, uses TCP window manipulation to shape traffic. FYI, both windows are likely reduced..you just cant see it on your end because it doesnt happen until it reaches the shaping device. The idea is the "trick" the receiver into thinking that the window is smaller than it is. One way around it is to encrypt your data in a vpn. Of course if they are limiting your IP address (or globally) it wont help, but your window wont be affected! dennis baasch Emerging Technologies, Inc. ------------------------------------------------------------------------------------- http://www.etinc.com ISA and PCI T1/T3/V35/HSSI Cards for FreeBSD and LINUX Multiport T1 and HSSI/T3 UNIX-based Routers Bandwidth Management Appliances Bandwidth Management software for LINUX and FreeBSD - : 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