IP forward-protocol...like a layer 3 and above relay. If it is a layer 3 engine (routing), you have created separate broadcast domains, and therefore need to forward the broadcasts by means of the ip forward-address/protocol command...something like that. That's my guess without knowing how things are configured...
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tim@tim-laptop ~ $ sudo apt-get install windows
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package windows...Thank Goodness!