I have a problem with routers Cisco IOS 2600 on simulator Routersim. I have connected 2 routers with serial interface and configured IP but when I ping from the first router to the second the response is 100% lost packets. What should I do? Why my routing table must by? I have 192.168.20.1/24 on the first router and 192.168.20.2/24 on the second router.