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UDP test problem

hi all:
       I write a driver for a network adapter , and I used netdemo to test
the driver. It can ping , telnet and transmit TCP packets successfully,but I
met
a problem when I used it to transmit UDP packets.
       When I first typed the 'u' command in the console after netdemo got
run, it can only transmit *one* UDP packet( after it transmit 5 UDP
broadcast packets and an ARP packet ), and then I typed the 'u' command
again, now it can transmit the UDP packets successfully.
       So, any one can give some advices ?Thanks a lot.
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