OSPF Challenge #2: Mixing Numbered and Unnumbered Interfaces
This challenge is closed, see the final results (November 4th 2008).
Assuming you have the following configurations on R1 and R2:
R1 configuration
hostname R1
!
interface Loopback 0
ip address 10.0.0.1 255.255.255.255
!
interface Serial 0
encapsulation ppp
ip unnumbered Loopback0
ip ospf 1 area 1
!
router ospf 1
R2 configuration
hostname R2
!
interface Serial 0
encapsulation ppp
ip address 10.1.2.3 255.255.255.248
ip ospf 1 area 1
!
router ospf 1
What IP address can you use on the loopback interface of R1 to establish adjacency between R1 and R2? Can you use more than one IP address?