Zenmap on my Windows 7 laptop. I ran an intense scan with UDP targeting my router
I realize that I'm probing into the back end of the router from the inside and that any open ports are nothing to be concerned about.
At the time, my iPod (on standby/not turned on) and my laptop were the only connected devices.
In the left-hand window under HOSTS (OS / Host) I have two entries:
- host 2-96--.as13285.net(2.96.*.""") - (I've hidden some numbers as *)
2-96.... highlighted, and the Ports/Hosts tab in the right window selected, I see
443 all filtered and
631 (IPP) open.
However, if instead I now highlight
192.168.1.1, I see two more services listed, both UDP, and both open:
My questions are:
Given that my external IP address
192.168.1.1are exactly the same device (the router), why do I see 2 extra services (granted they are UDP) if I look at the
I envisage the NAT and firewall systems as sitting in the middle of the router, between the front end and the back end.
And thinking that the back end of my router is waiting to receive any traffic from any possible port inside my network, I would not have been surprised if the scan had said all
65000ports are open or at least listening/filtered (I know that
"listening"is not a state NMAP recognises).
So what's so special about the 6/8 ports/services that are detected and why aren't all
65000found in one way or another?