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Thank you very much for the reply. Your tip helped me find out that I simply forgot to process non-IP packets (see line 17 in the code…).

I guess that at some point, lack of ARP/RARP functionality hanged up the LAN.

Regarding MTU: As far as I know, windows default MTU for ethernet adapters is 1500. I always attach a 20 bytes key to outgoing UDP packets.
Can I conclude from this that I might have a problem only with packets whose total length is 1480 bytes or more ?

Another question:
Can I catch packets that are directed either to or to the local IP ? are those packets passed down the TCP stack or are they redirected by Windows back to the application at higher levels ?

Thanks again,