how can i reach R1? I can see the route in the table routing but i can't access by telnet and not respond to ping from R2 and R3.I think i don't understand the secondary address feature. Someonte to help me?
This is mi configuration on R2:
ip address 192.168.0.2 255.255.255.128 secondary
ip address 192.168.1.30 255.255.255.0
ip address 126.96.36.199 255.255.255.0
no ip classless
ip route 192.168.0.0 255.255.255.128 FastEthernet0/0
in addition to good note from Reza I would suggest to use extended ping in order to be able to specify the source address for the ping attempts.
When you ping an ip address on a LAN interface on local router the packet doesn't go out on the wire.
When you attempt to ping R1 ip address R2 should use its secondary address as source but to be sure it is better to use the extended ping
Hope to help
I do not understand what the secondary interface is for. You have 3 routers. Router 1 physically connects to router 2 and also router 3 physically connects to router 2.
Can you post the interface config from all 3 routers for all the interfaces. To be able to ping end-to-end, you need a static route from router 1 pointing to router 2 interface and also a static route from router 3 pointing to router 2 interface.