<!-- MHonArc v2.4.4 --> <!--X-Subject: Re: [MUD-Dev] Transport layer (UDP vs TCP) --> <!--X-From-R13: Xba Zrbaneq <wyrbaneqNqvipbz.hzbc-nc.pbz> --> <!--X-Date: Tue, 17 Mar 1998 19:22:28 +0000 --> <!--X-Message-Id: 19980317111840.55762#divcom,umop-ap.com --> <!--X-Content-Type: text/plain --> <!--X-Reference: Pine.LNX.3.96.980316230342.719A-100000#shamen,cyberhighway.net --> <!--X-Reference: Pine.SOL.3.96.980317193359.8501A-100000#licia,dtek.chalmers.se --> <!--X-Head-End--> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <html> <head> <title>MUD-Dev message, Re: [MUD-Dev] Transport layer (UDP vs TCP)</title> <!-- meta name="robots" content="noindex,nofollow" --> <link rev="made" href="mailto:jleonard#divcom,umop-ap.com"> </head> <body background="/backgrounds/paperback.gif" bgcolor="#ffffff" text="#000000" link="#0000FF" alink="#FF0000" vlink="#006000"> <font size="+4" color="#804040"> <strong><em>MUD-Dev<br>mailing list archive</em></strong> </font> <br> [ <a href="../">Other Periods</a> | <a href="../../">Other mailing lists</a> | <a href="/search.php3">Search</a> ] <br clear=all><hr> <!--X-Body-Begin--> <!--X-User-Header--> <!--X-User-Header-End--> <!--X-TopPNI--> Date: [ <a href="msg00738.html">Previous</a> | <a href="msg00741.html">Next</a> ] Thread: [ <a href="msg00737.html">Previous</a> | <a href="msg00745.html">Next</a> ] Index: [ <A HREF="author.html#00739">Author</A> | <A HREF="#00739">Date</A> | <A HREF="thread.html#00739">Thread</A> ] <!--X-TopPNI-End--> <!--X-MsgBody--> <!--X-Subject-Header-Begin--> <H1>Re: [MUD-Dev] Transport layer (UDP vs TCP)</H1> <HR> <!--X-Subject-Header-End--> <!--X-Head-of-Message--> <UL> <LI><em>To</em>: <A HREF="mailto:mud-dev#null,net">mud-dev#null,net</A></LI> <LI><em>Subject</em>: Re: [MUD-Dev] Transport layer (UDP vs TCP)</LI> <LI><em>From</em>: Jon Leonard <<A HREF="mailto:jleonard#divcom,umop-ap.com">jleonard#divcom,umop-ap.com</A>></LI> <LI><em>Date</em>: Tue, 17 Mar 1998 11:18:40 -0800</LI> <LI><em>Cc</em>: Jon Leonard <<A HREF="mailto:jleonard#divcom,umop-ap.com">jleonard#divcom,umop-ap.com</A>></LI> </UL> <!--X-Head-of-Message-End--> <!--X-Head-Body-Sep-Begin--> <HR> <!--X-Head-Body-Sep-End--> <!--X-Body-of-Message--> <PRE> On Tue, Mar 17, 1998 at 10:58:58AM +0000, Niklas Elmqvist wrote: > On Tue, 17 Mar 1998, Ben Greear wrote: > > > > I'm pondering a multi level transport stream. The important stuff > > would go over tcp/ip, and the client-side-cache updates would run > > over UDP. > > > > The question is, what is the packet size (max) that UDP can handle? > > A good place to find information about anything that even remotely > pertains to networks and the Internet are the RFC docs. A bit technical > (but that's how we like them) but usually of good standard. You can find a > directory containing ASCII-text versions of all the RFCs at > <URL:<A HREF="http://ftp.sunet.se/pub/Internet-documents/rfc/">http://ftp.sunet.se/pub/Internet-documents/rfc/</A>> (the index is called > rfc-index.txt). > > RFC 1180 is a TCP/IP tutorial, and a good one at that, but only brushes > through UDP. RFC 768 concerns itself solely with UDP, the answer to your > question might be found there. It's likely more complicated than that. The maximum size of a UDP packet is about the maximum size of an IP datagram (quite large). Realisticly, though, you want largest packet that won't get broken up into fragments. The largest non-fragmenting packet (MTU = Maximum Transfer Unit) depends on the networks involved. For Ethernet, it's about 1500 bytes. Most high speed networks have larger maxima, but you could see almost anything. A search for "MTU discovery" should probably find something on how some TCP implementations figure out what the optimal packet size is. Anyone seriously considering a UDP tranport protocol should write something similar. The basic idea is set the "don't fragment" bit, and play with packet size until you find out what works. Jon Leonard </PRE> <!--X-Body-of-Message-End--> <!--X-MsgBody-End--> <!--X-Follow-Ups--> <HR> <ul compact><li><strong>Follow-Ups</strong>: <ul> <li><strong><A NAME="00745" HREF="msg00745.html">Re: [MUD-Dev] Transport layer (UDP vs TCP)</A></strong> <ul compact><li><em>From:</em> Ben Greear <greear#cyberhighway,net></li></ul> </UL></LI></UL> <!--X-Follow-Ups-End--> <!--X-References--> <UL><LI><STRONG>References</STRONG>: <UL> <LI><STRONG><A NAME="00733" HREF="msg00733.html">Transport layer (UDP vs TCP)</A></STRONG> <UL><LI><EM>From:</EM> Ben Greear <greear#cyberhighway,net></LI></UL></LI> <LI><STRONG><A NAME="00737" HREF="msg00737.html">Transport layer (UDP vs TCP)</A></STRONG> <UL><LI><EM>From:</EM> Niklas Elmqvist <d97elm#dtek,chalmers.se></LI></UL></LI> </UL></LI></UL> <!--X-References-End--> <!--X-BotPNI--> <UL> <LI>Prev by Date: <STRONG><A HREF="msg00738.html">Re: [MUD-Dev] Speaking of Avatars</A></STRONG> </LI> <LI>Next by Date: <STRONG><A HREF="msg00741.html">Re: [MUD-Dev] Balancing Addicts</A></STRONG> </LI> <LI>Prev by thread: <STRONG><A HREF="msg00737.html">Transport layer (UDP vs TCP)</A></STRONG> </LI> <LI>Next by thread: <STRONG><A HREF="msg00745.html">Re: [MUD-Dev] Transport layer (UDP vs TCP)</A></STRONG> </LI> <LI>Index(es): <UL> <LI><A HREF="index.html#00739"><STRONG>Date</STRONG></A></LI> <LI><A HREF="thread.html#00739"><STRONG>Thread</STRONG></A></LI> </UL> </LI> </UL> <!--X-BotPNI-End--> <!--X-User-Footer--> <!--X-User-Footer-End--> <ul><li>Thread context: <BLOCKQUOTE><UL> <LI><STRONG>Re: [MUD-Dev] XShipWars</STRONG>, <EM>(continued)</EM> <ul compact> <ul compact> <LI><strong><A NAME="00848" HREF="msg00848.html">Re: [MUD-Dev] XShipWars</A></strong>, J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Mon 23 Mar 1998, 18:48 GMT </LI> </ul> </ul> </LI> <LI><strong><A NAME="00735" HREF="msg00735.html">Balancing Addicts</A></strong>, Ling <a href="mailto:K.L.Lo-94#student,lboro.ac.uk">K.L.Lo-94#student,lboro.ac.uk</a>, Tue 17 Mar 1998, 14:32 GMT <LI><strong><A NAME="00733" HREF="msg00733.html">Transport layer (UDP vs TCP)</A></strong>, Ben Greear <a href="mailto:greear#cyberhighway,net">greear#cyberhighway,net</a>, Tue 17 Mar 1998, 05:58 GMT <UL> <LI><strong><A NAME="00737" HREF="msg00737.html">Transport layer (UDP vs TCP)</A></strong>, Niklas Elmqvist <a href="mailto:d97elm#dtek,chalmers.se">d97elm#dtek,chalmers.se</a>, Tue 17 Mar 1998, 18:41 GMT <UL> <LI><strong><A NAME="00739" HREF="msg00739.html">Re: [MUD-Dev] Transport layer (UDP vs TCP)</A></strong>, Jon Leonard <a href="mailto:jleonard#divcom,umop-ap.com">jleonard#divcom,umop-ap.com</a>, Tue 17 Mar 1998, 19:22 GMT <UL> <LI><strong><A NAME="00745" HREF="msg00745.html">Re: [MUD-Dev] Transport layer (UDP vs TCP)</A></strong>, Ben Greear <a href="mailto:greear#cyberhighway,net">greear#cyberhighway,net</a>, Wed 18 Mar 1998, 05:05 GMT <UL> <LI><strong><A NAME="00752" HREF="msg00752.html">Re: [MUD-Dev] Transport layer (UDP vs TCP)</A></strong>, Jon Leonard <a href="mailto:jleonard#divcom,umop-ap.com">jleonard#divcom,umop-ap.com</a>, Wed 18 Mar 1998, 17:48 GMT <UL> <LI><strong><A NAME="00758" HREF="msg00758.html">Re: [MUD-Dev] Transport layer (UDP vs TCP)</A></strong>, Ben Greear <a href="mailto:greear#cyberhighway,net">greear#cyberhighway,net</a>, Thu 19 Mar 1998, 00:52 GMT <UL> <LI><strong><A NAME="00763" HREF="msg00763.html">Re: [MUD-Dev] Transport layer (UDP vs TCP)</A></strong>, Niklas Elmqvist <a href="mailto:d97elm#dtek,chalmers.se">d97elm#dtek,chalmers.se</a>, Thu 19 Mar 1998, 08:18 GMT </LI> </UL> </LI> </UL> </LI> </UL> </LI> </UL> </LI> </UL> </LI> </UL> </LI> </UL></BLOCKQUOTE> </ul> <hr> <center> [ <a href="../">Other Periods</a> | <a href="../../">Other mailing lists</a> | <a href="/search.php3">Search</a> ] </center> <hr> </body> </html>