en
conf t
hostname r1
no service call-home
no call-home
no ip http server
no ip http authentication local
no ip http secure-server
!
int g1
ip add 12.0.0.1 255.255.255.0
no shut
exit
!
int lo0
ip add 1.1.1.1 255.255.255.255
exit
!
line con 0
logg syn
exec-timeout 0 0
width 512
history size 256
exit
do wr

en
conf t
hostname r2
no service call-home
no call-home
no ip http server
no ip http authentication local
no ip http secure-server
!
int g1
ip add 12.0.0.2 255.255.255.0
no shut
exit
!
int lo0
ip add 2.2.2.2 255.255.255.0
exit
!
line con 0
logg syn
exec-timeout 0 0
width 512
history size 256
exit
do wr

r1#ping 12.0.0.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 12.0.0.2, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 1/1/3 ms

r1#ping 2.2.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

This will be fixed on Lab 00100.