Gateway Hacking

Hi, i'm currently pentesting a network, i hacked into some cisco devices (switches, phones...), and the gateway specified in them is 192.168.1.254, i tried hacking it, started nmap'ing, using different scan types and commands, most of them said that all 1000 ports (which are the most important though) are filtered, and some said open|filtered, i couldn't even find what OS it uses (nmap -O ...)! i don't know anything about it! I don't know what type of devices is this, i couldn't access it using a browser (port 80, or 8080), i tried netcat, and telnet, nothing worked! I think it is behind a firewall or something!

So what do hackers normally do in those situations ?! Note that i don't know where it is located in the building!