packet does not get to tcp ip

Hi,

I have this strange problem:

I am trying to do a ping through the NIC connected to my ethernet
miniport driver.
With a sniffer (ethereal) on the NIC I can see the icmp request and
also the icmp reply packets both seems correct as far as I can see, yet
the ping application failed with timeout.
This happen also when I try tcp application like ftp.

It seems like the packets the driver indicate to NDIS does not reach
the tcp ip protocol driver (or maybe they do and the protocol driver
drop them for some reason) so the the application at the end point does
not receives them.

The firewall rule on the interface are permit all.

Where should I look for the trouble?

How can I gather more information - for example how can I know if the
tcp ip gets the packet after I indicate it to ndis? how can I know if
it drop it?

Thanks
Miki

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