Unable to enable "Directed broadcast" on router in packet tracer?

Question

I have a topology like below, wherein 2 subnets with address 192.168.0.0/24 and 192.168.1.0/24 are connected to a single router, Router0.

Now i want to send a directed broadcast from PC0 on subnet 192.168.0.0/24 to subnet 192.168.1.0/24. When i try doing it, it does not work as expected.

When i ping 192.168.1.255 from PC0, below is reply i get. The packet is not going past Router0's interface gigabitethernet0/0 at all!

C:>ping 192.168.1.255

Pinging 192.168.1.255 with 32 bytes of data:

Reply from 192.168.0.1: bytes=32 time=1ms TTL=255
Reply from 192.168.0.1: bytes=32 time<1ms TTL=255
Reply from 192.168.0.1: bytes=32 time<1ms TTL=255
Reply from 192.168.0.1: bytes=32 time=1ms TTL=255

Ping statistics for 192.168.1.255: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 1ms, Average = 0ms

I understand that by default directed broadcast is disable on most of the routers. I could confirm the same by executing the below command-

Router#show ip interface gigabitethernet0/0 | include broadcast
Directed broadcast forwarding is disabled

So it needs to be enabled.

I followed few links and understood that i need to execute the command

ip directed-broadcast

So i tried as below-

Router#config terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface gigabitethernet0/0
Router(config-if)#ip directed-broadcast

                 ^ % Invalid input detected at '^' marker.  

Router(config-if)#

Looks like the router is not recognizing the command itself.

If I execute the command ip ? to see the supported arguments for ip command, it lists as below-

Router(config-if)#ip ?
  access-group     Specify access control for packets
  address          Set the IP address of an interface
  authentication   authentication subcommands
  flow             NetFlow Related commands
  hello-interval   Configures IP-EIGRP hello interval
  helper-address   Specify a destination address for UDP broadcasts
  mtu              Set IP Maximum Transmission Unit
  nat              NAT interface commands
  ospf             OSPF interface commands
  proxy-arp        Enable proxy ARP
  split-horizon    Perform split horizon
  summary-address  Perform address summarization

And looks like there is no directed-broadcast argument support!

Could someone please help me, how should I go ahead in enabling directed broadcast feature in the router?

Answer 1

The command you mentioned above it is not supported by Packet Tracer. Packet Tracer will not provide you all the features of a Router. For Routing you can use GNS3 which is the best software for routing and you can download it, as freeware.

In real equipment, it enables a port to send traffic to a host address with all ones. This reaches all hosts on that subnet. For example we could have an interface with address 192.168.1.1/24. If we enable directed-broadcast and sent a packet to 192.168.1.255, it will be broadcasted to all hosts on that interface. It will use a destination Mac address of FF-FF-FF-FF-FF-FF.