So Jim, you'd use TCP for streaming video? I'd call that time sensitive, and if the packet is out of sequence, it's useless. No need for TCP there. How about online gaming? WoW, M59, etc, they all use UDP for data transmission. Time sensitive. Didn't get it soon enough? Why bother processing something that you don't even need to know about. Why use TCP to reconstruct the packet sequence when it's pointless. It wastes CPU cycles and network card buffers to hold out of sequence packets. PCAnywhere uses UDP for data stream for the remote desktop. Time sensitive? Yes. Why in the hell would I want to see my mouse jump around the screen doing things that I did a few seconds ago? If you even bothered to understand what I wrote, you'd see that you even agreed with me that it's non-guaranteed delivery. Data that either is there or useless to me IS time sensitive. Just because your definition of time sensitive is different than mine does not make my fist post any less valid that your post. -----Original Message----- From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx] Sent: Thursday, February 10, 2005 4:11 PM To: [ISAserver.org Discussion List] Subject: [isalist] RE: UDP Question Some reading on basic TCP/IP is clearly in order... "UDP is normally used for time sensitive information"?!? Where did you get this? UDP in and of itself provides no delivery guarantees whatsoever. -----Original Message----- From: TRadtke@xxxxxxxxxxxx [mailto:TRadtke@xxxxxxxxxxxx] Sent: Thursday, February 10, 2005 1:41 PM To: [ISAserver.org Discussion List] Subject: [isalist] RE: UDP Question http://www.ISAserver.org Well, UDP is normally used for time sensitive information. UDP delivery is not guarantied at all. Most of the time it's used both ways if it's being used since if I'm not getting your traffic, it really won't matter if your not getting mine. For example, live video streams.