Aman
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.
Fa0/1 10.192.48.35 Null 10.192.48.255 11 0089 0089 3
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.
So this is normal behavior and not a problem.
HTH
Rick
HTH
Rick