RE: UDP Question
- From: "Jim Harrison" <Jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Thu, 10 Feb 2005 14:11:06 -0800
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.
TCP == "stateful" at the IP layer. The client / server pair have a
defined "connection" between them. This protocol provides for IP-level
error handling and traffic control.
UDP == "stateless" at the IP layer. The client / server pair have no
connection "state" and merely barf packets at each other. It's up to
the applications running on each host to provide error handling and
handle traffic control.
Simplex traffic (one direction per port):
1 - Send = only outbound traffic
2 - Receive = only inbound traffic
Duplex traffics (bi-directional per port):
3 - Send-Receive = traffic is received on this port, but ONLY if traffic
is sent first
1 - Receive-Send = traffic is sent on this port, but ONLY if traffic is
received first
In all cases, "send" refers to traffic that comes from an ISA-protected
network, while "receive" means traffic that travels in the opposite
direction.
Hope that's a bit clearer...
-----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.
-----Original Message-----
From: Andrew English [mailto:andrew@xxxxxxxxxxxxxxxxxxxxxx]
Sent: Thursday, February 10, 2005 3:37 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: UDP Question
http://www.ISAserver.org
Hey Steve,
Actually its not a silly question Cable/DSL routers use a default UDP
setting, when you look at companies port settings for VPN say, or a
online game, or whatever you want, they don't specific UDP Send, or any
of the other variables.
Andrew
-----Original Message-----
From: Steve Moffat [mailto:steve@xxxxxxxxxx]
Sent: Thursday, February 10, 2005 3:50 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: UDP Question
http://www.ISAserver.org
Very silly question...:))
All of the above, depends if it's coming or going, going or coming,
coming and going or going and coming.
S
-----Original Message-----
From: Andrew English [mailto:andrew@xxxxxxxxxxxxxxxxxxxxxx]
Sent: Thursday, February 10, 2005 4:40 PM
To: ISA Mailing List
Subject: [isalist] UDP Question
http://www.ISAserver.org
What is the normal for UDP? Send, Send Receive, Receive, Receive Send,
etc.. ?
Every time I see port information for UDP I don't know which variables I
should be using.
Andrew
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