Problem with multicast in 6.2.0

Hello,
Could anybody help me with this.My QNX machine has RealTek
ethernet card and driver installed.(The version is Qnx Neutrino 6.2…
The QNX document says that all multicast packets can be received by
default.
But iam not able to recieve multicast packets.We are able to receive other
packets.

An explicit devctl() for setting all multicast option on the interface
returns
failure.

In Qnx Version 6.1.0 we were able to receive all multicast packets by
default.Can anybody help me

regards,
deepak