I am trying to make a perl script for Rose expolit. In that I need to set frag_off. The problem is this, other than when set to 0, the packet is actually never sent off the NIC when frag_off is set to other value.

  $packet_generic = new Net::RawIP({
                            ip   => {
                                     saddr => $src_address,
                                     daddr => $target_address,
                                     id => 0x455,
                                     ttl => 255,
                                     tos => 0,
                                     frag_off => 0x67FF
                                         },
                                generic => {
                                        data => "asdasdasdasdasdasd"
                                        }
                          });
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I am able to send this above packet only when frag_off value is 0. I checked many other scripts on net and tried putting frag_off to non-zero, but of no help. Please help