I used two QNX632 machines(192.168.1.1 and 192.168.1.2) and one XP(192.168.1.10), all installed with the Orinoco 802.11b
 PCcard. i started the driver on qnx with "mount -o network=work,mode=adhoc,channel=11 -T io-net devn-orinoco.so".
The problem now is: ping pkts go thru btw 1.10 and 1.1, also ok btw 1.10 and 1.2, but failed when ping btw 1.1 and 1.2. 
And got the following errors:
i got the following errors when trying to ping from 1.1 to 1.2:
devn-orinoco: CFG_CNF_PORT_TYPE failed.
devn-orinoco: CFG_CNF_OWN_CHANNEL failed.
devn-orinoco: CFG_RTS_THRH failed.
devn-orinoco: CFG_CNF_DESIRED_SSID failed.
devn-orinoco: CFG_CNF_OWN_MAC_ADDR failed.
devn-orinoco: CFG_CNF_OWN_NAME failed.
devn-orinoco: CFG_IBSS_MODE failed.
devn-orinoco: CFG_CNF_ENCRYPTION failed.
devn-orinoco: CFG_CNF_MCAST_RX failed.
devn-orinoco: Unable to enable hcf.
ping: sendto: No buffer space available
ping: sendto: No buffer space available
ping: sendto: No buffer space available
ping: sendto: No buffer space available

Do appreciate comments. Thx.

Eric