speedo driver problems

I try to install speedo ethernet driver on a STPC target with a 82559ER:
Installation is OK,
Link indicator is OK,
Speed detection is OK (10 or 100 Mb/s) depending of the host speed.
but ping utility doesn’t work (message : Host is down ).
Nicinfo utility indicates :
“Total Packet Txd OK = 5” and anything else (no error).

I have same problem with QNX 6.1 and QNX 6.2 (tiny and full stack TCP/IP).