From that png, it looks like you're attempting to use the network simulator together with a tcl program to create a broadcast message on the simulated network.
If this is the case, provide the following information:
- The version of Ubuntu you're using.
- The version of the network simulator you're using. (The latest version on 12.10 is ns3.)
- The configuration of the simulated network.
- The tcl program you're using. (Click the "Go Advanced" button, and insert the code using the # button above the input box.)
Note: I've never used the ns
, so I won't be able to actually help you solve your problem. But, if you include the necessary information, you're much more likely to find someone that can help. (And, consider editing your thread title to actually ask a question. In the current form, you make people work just to try to find out what question you're really asking.)