I was playing around with NMap and found some hots in my private IP range that I don't recognize. I use 192.168.1.* and I found some 192.168.2.* hosts, one of which has port 23 open for SSH (tried to login using my known credentials, access denied). The OS detection on that host says it's reasonably sure it's running IOS, but I have no Cisco hardware (I have a Linksys WRT54G but it's running HyperWRT). One of the other hosts has a port open for H.323 which as far as I can tell is a VoIP protocol...I have no VoIP on my network, not even Vonage. What the hell is going on here? Have I been pwned?