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<TITLE>Re: [e2e] Are we doing sliding window in the Internet?</TITLE>
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<DIV id=idOWAReplyText20462 dir=ltr>
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<DIV dir=ltr><FONT face="Courier New" size=2>Joe Touch wrote -</FONT></DIV>
<DIV dir=ltr><FONT size=2><FONT face="Courier New">>>> FYI,Internet
MSS's are usually in the 500-byte range in general. A<BR>>>> 5KB file
would take 10 packets and be over by the 4th round.<BR>>><BR>>> Um,
the Internet MSS is usually 1460 bytes, except where it is hacked<BR>>> to
between 1300 and 1400 bytes to avoid issues with broken Path MTU<BR>>>
Detection in the presence of links with an MTU slightly smaller than<BR>>>
1500 (mostly ADSL links).<BR>>><BR>>> Packets around 500 bytes have
become quite rare on the Internet today.<BR><BR></FONT>> <A
href="http://netweb.usc.edu/~rsinha/pkt-sizes/"><FONT
face="Courier New">http://netweb.usc.edu/~rsinha/pkt-sizes/</FONT></A><BR>>
<A
href="http://tracer.csl.sony.co.jp/mawi/samplepoint-C/2005/200510250900.html"><FONT
face="Courier New">http://tracer.csl.sony.co.jp/mawi/samplepoint-C/2005/200510250900.html</FONT></A><BR><BR><FONT
face="Courier New">> 'better connected' sites show larger packet sizes (show
in the USC<BR>> traces), but that smaller packets are still used, and that
the average<BR>> size depends on the protocol (CSL
traces).<BR></FONT></FONT></DIV>
<DIV dir=ltr><FONT size=2><FONT face="Courier New">Even though smaller packet
sizes are observed on the net,</FONT></FONT></DIV>
<DIV dir=ltr><FONT size=2><FONT face="Courier New">depending on
</FONT></FONT><FONT size=2><FONT face="Courier New">protocol and application,
that does not imply</FONT></FONT></DIV>
<DIV dir=ltr><FONT size=2><FONT face="Courier New">that the
MSS </FONT></FONT><FONT size=2><FONT face="Courier New">or path MTU
</FONT></FONT><FONT size=2><FONT face="Courier New">is small. Some applications
simply send small</FONT></FONT></DIV>
<DIV dir=ltr><FONT size=2><FONT face="Courier New">amounts </FONT></FONT><FONT
size=2><FONT face="Courier New">of data, at a time (telnet, http GETs,
etc).</FONT></FONT></DIV>
<DIV dir=ltr><FONT size=2><FONT face="Courier New">I suspect, MSS is of the
order of </FONT></FONT><FONT size=2><FONT face="Courier New">1300-1460
bytes,</FONT></FONT></DIV>
<DIV dir=ltr><FONT size=2><FONT face="Courier New">e</FONT></FONT><FONT
size=2><FONT face="Courier New">ven </FONT></FONT><FONT size=2><FONT
face="Courier New">in these </FONT></FONT><FONT face="Courier New"
size=2>traces.</FONT></DIV>
<DIV dir=ltr><FONT size=2><FONT face="Courier New"></FONT></FONT> </DIV>
<DIV dir=ltr><FONT size=2><FONT face="Courier New">Regards,</FONT></FONT></DIV>
<DIV dir=ltr><FONT size=2><FONT face="Courier New">Anil</FONT></FONT></DIV>
<DIV dir=ltr><FONT size=2><FONT
face="Courier New"> </DIV></FONT></FONT>
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