[Winpcap-users] WinPcap, VMWare and Packet Loss

[Gianluca Varenni]

Why are you still using WinPcap 3.1 beta? That's OLD!
What is the bandwidth that we are talking about?
What VM technology are you using?

Have a nice day
GV

----- Original Message ----- 
From: "Max WhoTheHellCares" <krakazzyabra at gmail.com>
To: <winpcap-users at winpcap.org>
Sent: Monday, March 02, 2009 11:59 AM
Subject: [Winpcap-users] WinPcap, VMWare and Packet Loss


> Hi everybody!
> 
> I have recently stumbled upon a problem, which renders my project
> nearly useless....
> 
> I have 2 VMs on two physical servers, each one runs Win2k3 Server. My
> server-side program sends packets using WinPcap, the client-side gets
> them using WinPcap (lets call them Tx and Rx respectively).
> Up till now i worked without VMs - Win2k3 Server was installed on both
> physical servers. My project worked like it should - without losses
> during packet transfer from server to client.
> 
> Now, as i started using VMs (Virtual NIC is BRIDGED to physical), i
> get packet loss ~11% in case Tx AND Rx are installed on VMs.
> If i install only one side (Tx OR Rx) on VM and the other one on
> physical disk(on another server), packet loss is still present, but
> varies depending on which side (Tx or Rx) is installed on VM. It goes
> like this:
> 
> Transmitter      Receiver      %packet loss
> -------------------------------------------------------------
> TX                  RX               0%
> TX                  VM_RX        10%
> VM_TX            RX              0.1%
> VM_TX            VM_RX        11%
> 
> where TX, RX - installed on physical machines
>         VM_TX, VM_RX - installed on virtual machines.
> 
> How it works: having done extensive debug on the Tx side,
> pcap_sendpacket(...) sends everything without errors. However the Rx
> side still registers packet loss. BTW, WinPcap version is 3.1beta.
> 
> Please, if someone has a clue of why this happens, share your
> thoughts, my project is on-hold ATM.
> 
> Thanks in advance.
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