Hi Juan, Can you send me a rundown on your setup (card type, ifconfig, switch type). I've not seen this problem with my setup and I know that others have run large sessions between machines. It could be a combination of driver and app interaction or it could be the switch. Do you have a cross-over cable you could use? Did the jitter build up in a linear manner or was there a sudden jump. Cheers Phil On Sunday, August 15, 2004, at 10:52 pm, Juan Linietsky wrote: