[Winpcap-users] winpcap 4.0.2 possible packet loss?

[Tony Ballardie]

No multiple threads being used.

 

What size of packet would be "too big"?

 

Thanks

 

Tony

 

From: winpcap-users-bounces at winpcap.org
[mailto:winpcap-users-bounces at winpcap.org] On Behalf Of Gianluca Varenni
Sent: 17 October 2008 22:11
To: winpcap-users at winpcap.org
Subject: Re: [Winpcap-users] winpcap 4.0.2 possible packet loss?

 

The only thing I can think of is that you were trying to transmit
packets that were too big. Otherwise I don't know exactly why it might
be failing. Are you sending the packets from multiple threads on the
same pcap_t handle?

 

Have a nice day

GV

	----- Original Message ----- 

	From: Tony Ballardie <mailto:Tony.Ballardie at global-mix.com>  

	To: winpcap-users at winpcap.org 

	Sent: Monday, October 13, 2008 1:48 PM

	Subject: RE: [Winpcap-users] winpcap 4.0.2 possible packet loss?

	 

	Well the issue *may* be a red-herring. I was using a Microsoft
Remote Desktop connection and monitoring packet receive statistics in
the Windows media player. Apparently WM player stats viewed over RDP can
be misleading.

	 

	Although the problem seemed to manifest itself on Win Server
2003 and Server 2008 Enterprise Edition, on both occasions the issue was
only seen over Remote Desktop connections. So far nobody was able to
test it on the respective consoles. The network card on both machines is
a Broadcom NetXtreme Gigabit Ethernet.

	 

	Today I ran the same app on my local XP PC and experienced zero
packet loss. 

	 

	So perhaps this wasn't an issue after all? I will continue
testing on XP and move onto other Microsoft platforms in due course,
when the issue *may* re-appear. Until then I'm parking the issue, unless
someone knows that it is a problem and can suggest a fix?

	 

	Thanks

	 

	Tony

	 

	Ps.which version of winpcap should I use on Vista? I downloaded
4.0.2 and installed it but the app that's using it "failed to initialize
pcap".

	 

	 

	 

	From: winpcap-users-bounces at winpcap.org
[mailto:winpcap-users-bounces at winpcap.org] On Behalf Of Gianluca Varenni
	Sent: 13 October 2008 21:20
	To: winpcap-users at winpcap.org
	Subject: Re: [Winpcap-users] winpcap 4.0.2 possible packet loss?

	 

	Do you have more details on the network card you are using
(brand and model)?

	 

	Have a nice day

	GV

		----- Original Message ----- 

		From: Tony Ballardie
<mailto:Tony.Ballardie at global-mix.com>  

		To: winpcap-users at winpcap.org 

		Sent: Friday, October 10, 2008 1:43 PM

		Subject: RE: [Winpcap-users] winpcap 4.0.2 possible
packet loss?

		 

		Some more information on this issue...

		 

		The function 'pcap_sendpacket' is failing up to 40% of
the time when sending the streaming multicast packets to the kernel.

		 

		Is this a known issue, and is there a fix??

		 

		Tony

		 

		 

		From: winpcap-users-bounces at winpcap.org
[mailto:winpcap-users-bounces at winpcap.org] On Behalf Of Tony Ballardie
		Sent: 10 October 2008 12:21
		To: winpcap-users at winpcap.org
		Subject: [Winpcap-users] winpcap 4.0.2 possible packet
loss?

		 

		Hi,

		 

		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. 

		 

		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. 

		 

		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.

		 

		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.

		 

		Or perhaps certain parameters need setting accordingly?

		 

		The network adapter is a Broadcom NetXtreme Gigabit
Ethernet adapter.

		 

		Any suggestions would be greatly appreciated.

		 

		Thanks

		 

		Tony

		 

		
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