How to find out the ip of the router sitting behind WDS?

Question

Computer networks

There are 2 routers on dd-wrt. Router1 has an Internet connection, distributes DHCP, several computers are locally connected to it. Router2 has a connection to router1 via WDS, DHCP is disabled, several computers are locally connected to it. How to find out the ip address of router2 from the local network of router1. There is access to the settings of router1, but there is no information about the ip issued to router2, but you really need to go into its settings.

Answer 1

It cannot be that the router does not have information about the issued addresses.
Look for a dhcp client list, arp table or network map.
What is Router 1?
Well, in general, you can scan the grid from a computer.

Answer 2

About arp -a is correct, only the arp table needs to be filled, and for this, ping the subnet with a broadcast as in this article