Packet Tracer 5.0

Unanswered Question
Sep 18th, 2008

When using Packet Tracer 5.0 configured with IOS 12.2 From the global interface [Router#(config-if)] I use command [ip subnet-zero] - return >

Berlin(config-if)#ip subnet-zero

% Invalid input detected at '^' marker.

question - What is the correct format for this command to work using Packet Tracer 5.0?

Note: the '^' is under the "b" in "subnet" in the CLI

I have this problem too.
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Hi There

This is exactly the problem with using simulators to get hands on practice, you will find lots of commands just don't work they they do a real hardware. This is why so many folks set up a proper home lab using second hand equipment from the likes of Ebay.

If you don't have the budget for real equipment and you have access to real IOS images, then check out Dynamips/Dynagen.

Otherwise you will just have to put up with these simulator problems.

Best Regards,


jcrussell Sun, 09/21/2008 - 17:18

ip subnet-zero is a global configuration command, not an interface command. On a real device, you can type it while in interface configuration mode and it will just pop you back to global mode. It might be a limitation of the simulator, as keeleym mentioned.

Router(config)#int f0/0

Router(config-if)#ip su?



Router(config)#ip su?


Router(config)#ip subnet-zero



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