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+ <TITLE> [Nel] TCP vs. UDP</TITLE>
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+ <H1>[Nel] TCP vs. UDP</H1>
+ <B>alfred</B>
+ <A HREF="mailto:alfred%40mazuma.net.au"
+ TITLE="[Nel] TCP vs. UDP">alfred@mazuma.net.au</A><BR>
+ <I>Fri, 6 Jul 2001 19:41:50 +1000</I>
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+<!--beginarticle-->
+<PRE>You *must* replace your transport mechanism with UDP :)
+
+TCP provides (nah, ensures) reliable delivery of data, but it can spend a
+long time transmitting (especially on clogged up links). Between packet
+errors and backoffs due to packet drops it can easily take 2seconds plus to
+get data down the &quot;tcp pipe&quot;. And seeing its a pipe, everything behind it is
+&quot;backed&quot; up. So, time critical data can't just jump past useless data (like
+MOTD's,etc).
+
+With UDP on the otherhand, you lose the reliable data, but you get your
+timeliness. Because of the datagram nature of transmission, you can also
+implement independant &quot;streams&quot;, with reliablity on some streams (via extra
+software layers) and timeliness on others (auto drop of old data for eg).
+
+Btw, you cannot &quot;design your own layer&quot;, because you need to use the
+existing internet to send your data (which will only accept UDP and TCP).
+However, they probably did add to UDP, by adding an extra software layer to
+provide &quot;reliable udp&quot; (its almost trivial to do).
+
+Any, UDP is the only option that is sensible for anything that has time
+critical performance or for things with mutliple &quot;data channels&quot;.
+
+BTW, I do stuff like this for a living (I am a network researched for
+www.dsto.defence.gov.au), with a fair bit of work in the voice arena, so I
+have some experience backing me up here :)
+
+
+----- Original Message -----
+From: &quot;Vianney Lecroart&quot; &lt;<A HREF="mailto:lecroart@nevrax.com">lecroart@nevrax.com</A>&gt;
+To: &lt;<A HREF="mailto:nel@nevrax.org">nel@nevrax.org</A>&gt;
+Sent: Friday, July 06, 2001 12:36 AM
+Subject: [Nel] TCP vs. UDP
+
+
+&gt;<i> Hi everybody!
+</I>&gt;<i>
+</I>&gt;<i> Let's talk a little bit about this great subject: TCP vs. UDP
+</I>&gt;<i>
+</I>&gt;<i> Thanks to Valerio Santinelli and Olivier Lejade, there's some cool
+</I>&gt;<i> discussion about this subject on the web and I would like to have your
+</I>&gt;<i> thought and discuss about this.
+</I>&gt;<i>
+</I>&gt;<i> On Anarchy Online game, they only use TCP protocol between client and
+</I>server
+&gt;<i> (other commercial online game use UDP) and it seems that it causes lot of
+</I>&gt;<i> problem like horrible ping or connection lost:
+</I>&gt;<i> <A HREF="http://aoforums.funcom.com/showthread.php?threadid=26297">http://aoforums.funcom.com/showthread.php?threadid=26297</A>
+</I>&gt;<i>
+</I>&gt;<i> There's also a mail on the MUD-Dev mailing list talking about these
+</I>problems
+&gt;<i> here:
+</I>&gt;<i> <A HREF="https://www.kanga.nu/archives/MUD-Dev-L/2001Q3/msg00009.php">https://www.kanga.nu/archives/MUD-Dev-L/2001Q3/msg00009.php</A>
+</I>&gt;<i>
+</I>&gt;<i> As you perhaps know, we only use TCP/IP (for server-server communication,
+</I>&gt;<i> but also for the client-server connection) and we currently think more and
+</I>&gt;<i> more about replacing the TCP client-server connection with a UDP one.
+</I>&gt;<i>
+</I>&gt;<i> In a first step, we would like to know your opinion about this choice. And
+</I>&gt;<i> in a next step, we'll do some test about ping/packet lost and so on to
+</I>&gt;<i> compare TCP and UDP, and we'll need your help to do that.
+</I>&gt;<i>
+</I>&gt;<i> Vianney Lecroart
+</I>&gt;<i> ---
+</I>&gt;<i> lead network programmer / nevrax.com
+</I>&gt;<i> icq#: 6870415
+</I>&gt;<i> homepage: <A HREF="http://ace.planet-d.net">http://ace.planet-d.net</A>
+</I>&gt;<i> www.geekcode.com: GCS/E d- s+++: a-- C+++$ UL++ P- L+++&gt;+$ E+&gt;- W++ N+ o?
+</I>K-
+&gt;<i> w++$ O- M- V- PS- PE? Y PGP t 5? X+ R- tv++ b- DI D+ G e++ h+ r-- y?
+</I>&gt;<i>
+</I>&gt;<i>
+</I>&gt;<i> _______________________________________________
+</I>&gt;<i> Nel mailing list
+</I>&gt;<i> <A HREF="mailto:Nel@nevrax.org">Nel@nevrax.org</A>
+</I>&gt;<i> <A HREF="http://www.nevrax.org/mailman/listinfo.cgi/nel">http://www.nevrax.org/mailman/listinfo.cgi/nel</A>
+</I>&gt;<i>
+</I>
+
+</pre>
+
+
+
+
+
+
+
+
+
+
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