I would hope most of the people here are interested in more than ripping off their neighbor's wireless. I hope this is your own router you are trying to exploit. Possibly if you rephrase your question...
nmap -v -A <router ip>
The above command will show you what common ports are open on your router and possibly what kind of router it is.
You could google for the type of router plus exploit.
You could possibly create a denial of service and steal the login credentials with a **** attack when the owner logs in to see what's going on.
Stealing your neighbor's bandwidth can have unexpected results. An email "from you" to everyone in your address book concerning your new sexual orientation comes to mind.