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Of course, there are tools out there to crack router admin passwords - then you could see every machine on the network, and set up port-forwarding to try whatever exploits you want...
Most home routers [linksys, belkin, netgear etc] that I have seen have a default setting that only allows you to access the web interface internally, so you mileage with this one may vary. But if you are able to access the config page, you can search for 'default router passwords', and have a decent chance of getting in.