Sergey Dorofeev -> August Abolins said..

 AA>> Therefore, I configure Router-2 with IP address
 SD> 192.168.10.1. I use the AA> WAN port of Router-2 and connect
 SD> it to any free port of Router-1. I AA> configure Router-2 with
 SD> WAN IP 192.168.1.3 (the same WAN IP that Router-1 AA> uses).
 SD> I leave DHCP enabled.

 SD> If you configure two routers with same IP 192.168.1.3 you will
 SD> get the IP address conflict.

192.168.3.1 is the WAN IP that points to the modem.   Don't both routers
have to have that as well as the same gateway IP?

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