Is Windows see device identifying information from ISF router?

[Reptix]

Let's assume that we have computer, which connects to internet by cable. The cable is first connected to wi-fi router (wi-fi is used for other computer, not this one). Than, cable is connected to ISP home router via cable. So wi-fi router is between computer and ISP router.

My question: Is Windows see any information which can identify ISP router or only information which can identify wi-fi router.
Or neither?

 

[voyagerfan99]

You're going to be double-NAT'd so unless you have the devices on the same subnet or you turn DHCP off on the 2nd router they aren't going to be able to communicate.

 

[johnb35]

Depends on how you have second router configured. In order for all computers to see and share information, share printers, see all connected routers then you must assign the second router an IP in the same ip subnet as the first router. So if router 1 has internal IP of 192.168.1.1 then you must assign router 2 IP as 192.168.1.2. You also must disable DHCP on the second router, disabling NAT may also be required. Also, you have to connect cable from lan from router 1 to lan on router 2 not the internet port. If you connect to the internet port, then anything connected to the second router will have a different IP address and can't share to other pcs.

 

[beers]

If you're double NATting then you're no longer directly in the broadcast domain of the ISP router. Usually you can collect some information via ARP/MAC and discovery protocols like LLDP or CDP, but those are all broadcast domain limited.

The advantage of which would be that your ISP doesn't directly have reach into your other internal segment from their managed device, although the disadvantage is that double NAT is generally undesirable for most home users. I use a double router setup, although the one on the backend is simply facilitating an IPSec VPN out to a colocation server.

It's possible if your system was compromised you could theoretically run a traceroute and log into the ISP device if it's using default creds as it would simply be the second hop in the path, but that's pretty uncommon. Also most ISP devices use a randomly generated user password that they print on the unit.