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<DIV><FONT size=2>Do you have more details on the network card you are using
(brand and model)?</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Have a nice day</FONT></DIV>
<DIV><FONT size=2>GV</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=Tony.Ballardie@global-mix.com
href="mailto:Tony.Ballardie@global-mix.com">Tony Ballardie</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=winpcap-users@winpcap.org
href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, October 10, 2008 1:43
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: [Winpcap-users] winpcap
4.0.2 possible packet loss?</DIV>
<DIV><FONT size=2></FONT><FONT size=2></FONT><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN style="COLOR: #0070c0">Some more information on this
issue...<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0070c0"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0070c0">The function ‘pcap_sendpacket’
is failing up to 40% of the time when sending the streaming multicast packets
to the kernel.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0070c0"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0070c0">Is this a known issue, and is
there a fix??<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0070c0"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0070c0">Tony<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0070c0"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #0070c0"><o:p> </o:p></SPAN></P>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: medium none; PADDING-LEFT: 4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: blue 1.5pt solid; PADDING-TOP: 0cm; BORDER-BOTTOM: medium none">
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0cm; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
lang=EN-US style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> <A
href="mailto:winpcap-users-bounces@winpcap.org">winpcap-users-bounces@winpcap.org</A>
[mailto:winpcap-users-bounces@winpcap.org] <B>On Behalf Of </B>Tony
Ballardie<BR><B>Sent:</B> 10 October 2008 12:21<BR><B>To:</B>
winpcap-users@winpcap.org<BR><B>Subject:</B> [Winpcap-users] winpcap 4.0.2
possible packet loss?<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Hi,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Winpcap 4.0.2 is being used on a Windows Server 2008 box to
capture UDP-tunnelled streaming media (IP multicast) packets and then present
de-capsulated/original multicasts for playback in windows media player on box.
Depending on the stream, the bitrate may be 500-600kbps. <o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>The underlying multicast packets are being IP fragmented at
source, so each fragment is UDP-tunnelled so arrives as its own UDP packet,
becoming an IP fragment after tunnel decapsulation. <o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I’m not the developer here but I’m presuming once the
tunnelled packets are decapsulated they are written back to NPF for subsequent
presentation to the IP layer and normal IP processing.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>The on-box media player is showing up to 40% packet loss
and wonder if this could be due to the NPF not being capable somehow of
processing packets under these higher bitrate conditions? The path between
source and receiver is just a single-hop LAN and I’m confident the packet loss
is not happening in the network.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Or perhaps certain parameters need setting
accordingly?<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>The network adapter is a Broadcom NetXtreme Gigabit
Ethernet adapter.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Any suggestions would be greatly
appreciated.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Thanks<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Tony<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV></DIV>
<P>
<HR>
<P></P>_______________________________________________<BR>Winpcap-users
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