Oleg Gopov wrote:
  IRQ

   0:    IO-APIC-*edge*   timer
   1:    IO-APIC-*edge*   i8042
Hello Armin. Please say, where you get this. In /proc ????????? 

These are the interrupts of my host OS (Suse 12.1/ 32bit) mapped to the interrupts of QNX 6.5) (-> virtualized version 6.5SP1 as provided by QSS !!

What host OS are you using ?
Could it be that the UDP packets are lost by the host OS ? ( Windows ?)
Are you using NAT or bridging with your guest OS (QNX) ?

Here are my results after a ftp transfer from the host to the guest:

# nicinfo
en0:
  AMD PCNET-32 Ethernet Controller

  Physical Node ID ........................... 000C29 794934
  Current Physical Node ID ................... 000C29 794934
  Current Operation Rate ..................... 10.00 Mb/s
  Active Interface Type ...................... UTP
  Maximum Transmittable data Unit ............ 1514
  Maximum Receivable data Unit ............... 1514
  Hardware Interrupt ......................... 0xa
  I/O Aperture ............................... 0x2000 - 0x207f
  Memory Aperture ............................ 0x0
  Promiscuous Mode ........................... Off
  Multicast Support .......................... Enabled

  Packets Transmitted OK ..................... 99
  Bytes Transmitted OK ....................... 8003
  Memory Allocation Failures on Transmit ..... 0

  Packets Received OK ........................ 603
  Bytes Received OK .......................... 251077
  Memory Allocation Failures on Receive ...... 0

  Single Collisions on Transmit .............. 0
  Deferred Transmits ......................... 0
  Late Collision on Transmit errors .......... 0
  Transmits aborted (excessive collisions) ... 0
  Transmit Underruns ......................... 0
  No Carrier on Transmit ..................... 0
  Receive Alignment errors ................... 0
  Received packets with CRC errors ........... 0
  Packets Dropped on receive ................. 0

No errors at all ...