Hi all, Please find the below sh run of three router. ROUTER R1 connect to R3 & R3 connect R2 -- but i can't ping to 20.20.20.1 from R1 using source 10.10.10.1 vice versa for R2. R1:interface FastEthernet0/0 ip address 192.168.1.1 255.255.255.252 du...