block ip fragmented packet

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We have iptables v1.4.21 running and i am trying to stop all
fragmented packet but following rules doesn't working what is wrong
here?



iptables -t raw -A PREROUTING -m u32 ! --u32 "0x4&0x3fff=0x0" -m
comment --comment "Fragmented" -j DROP

To test rules i am doing following:

ping -M want -s 3000 192.168.1.1
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