You seem to think that this is a problem, but it is in fact a normal behavior. We can explain the cause and there is no need for any remedy.
I have included one line from your output as an example. What this shows is that some device at address 10.192.48.35 on interface FastEthernet0/1 send a broadcast packet which was received by the router. Since routers do not forward broadcasts the router will discard this packet which is indicated by the destination of null.
It might help if we recognize that the source port and destination port are given in hex. The hex value of 89 is a decimal value of 137. So we can see that the packets here were broadcast NetBIOS packets which the router does not forward.
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