<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML xmlns="http://www.w3.org/TR/REC-html40" xmlns:o =
"urn:schemas-microsoft-com:office:office" xmlns:w =
"urn:schemas-microsoft-com:office:word"><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2800.1498" name=GENERATOR>
<STYLE>@page Section1 {size: 8.5in 11.0in; margin: 1.0in 1.25in 1.0in 1.25in; }
P.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman"
}
LI.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman"
}
DIV.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman"
}
A:link {
COLOR: blue; TEXT-DECORATION: underline
}
SPAN.MsoHyperlink {
COLOR: blue; TEXT-DECORATION: underline
}
A:visited {
COLOR: purple; TEXT-DECORATION: underline
}
SPAN.MsoHyperlinkFollowed {
COLOR: purple; TEXT-DECORATION: underline
}
SPAN.EmailStyle17 {
COLOR: windowtext; FONT-FAMILY: Arial; mso-style-type: personal-compose
}
DIV.Section1 {
page: Section1
}
</STYLE>
</HEAD>
<BODY lang=EN-US vLink=purple link=blue bgColor=#ffffff>
<DIV><FONT size=2>UDP sockets may sometimes return error conditions due to the
arrival of ICMP packets. </FONT><FONT size=2><A
href="http://tangentsoft.net/wskfaq/articles/bsd-compatibility.html">http://tangentsoft.net/wskfaq/articles/bsd-compatibility.html</A> says:</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV><!--StartFragment -->According to Ilpo Ruotsalainen, "...most BSD socket
implementations do not pass delayed UDP errors (ICMP port unreachable at
least, maybe others too) to <CODE>recvfrom()</CODE> while Winsock 2 [under
Windows 2000 but not Windows 98] does. Linux [behaves like Windows 2000] too,
but provives SO_BSDCOMPAT <CODE>setsockopt()</CODE> for being compatible with
the BSD style." </DIV></BLOCKQUOTE>
<DIV><FONT size=2>See also the posting at <A
href="http://lists.ximian.com/archives/public/mono-list/2004-February/018162.html">http://lists.ximian.com/archives/public/mono-list/2004-February/018162.html</A> .</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>It all sounds like a typical case of "your mileage may
vary depending on the Windows version"...</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Enzo</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=dbarrett@quinthar.com href="mailto:dbarrett@quinthar.com">David
Barrett</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=p2p-hackers@zgp.org
href="mailto:p2p-hackers@zgp.org">'Peer-to-peer development.'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, May 07, 2005 12:44
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [p2p-hackers] ICMP on
Win32</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Does anyone here have experience
receiving ICMP feedback for UDP packets on Win32?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I don’t know much about the topic
(and am wondering if anyone who does know can tell me whether it’s worth
learning), but I’m interested in learning about UDP delivery failures, network
congestion, timeouts, and so on.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">However, I’ve read it requires the
use of “raw” sockets, which I’ve elsewhere read are being slowly prohibited –
I think started with WinXP SP2.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Anyway, can you recommend any good
resources? My ultimate goal is to weave this into my reliable UDP layer,
but I’d like to hear from those who have gone before to see if it’s worth the
bother.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">-david<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P></DIV>
<P>
<HR>
<P></P>_______________________________________________<BR>p2p-hackers mailing
list<BR>p2p-hackers@zgp.org<BR>http://zgp.org/mailman/listinfo/p2p-hackers<BR>_______________________________________________<BR>Here
is a web page listing P2P
Conferences:<BR>http://www.neurogrid.net/twiki/bin/view/Main/PeerToPeerConferences<BR></BLOCKQUOTE></BODY></HTML>