packet tracer no ip routing command

in CCNA & CCENT
Hello,
I'm studying for CCNA. I'm working through an INE lab that wants me to put in no ip routing but none of the routers I have in packet tracer work so I don't understand what to do next. I tried it on a 3560 switch that is in packet tracer and it worked there, but it wont work on any of the routers. Thanks.
From the lab:
Set the default-gateway on R2, R3, and R4. Because we are using routers as the hosts, we must disable "ip routing" first and set the default gateway accordingly.
R2:
no ip routing
!
ip default-gateway 100.1.1.1
R3:
no ip routing
!
ip default-gateway 200.1.1.1
R4:
no ip routing
!
ip default-gateway 200.1.1.1
I'm studying for CCNA. I'm working through an INE lab that wants me to put in no ip routing but none of the routers I have in packet tracer work so I don't understand what to do next. I tried it on a 3560 switch that is in packet tracer and it worked there, but it wont work on any of the routers. Thanks.
From the lab:
Set the default-gateway on R2, R3, and R4. Because we are using routers as the hosts, we must disable "ip routing" first and set the default gateway accordingly.
R2:
no ip routing
!
ip default-gateway 100.1.1.1
R3:
no ip routing
!
ip default-gateway 200.1.1.1
R4:
no ip routing
!
ip default-gateway 200.1.1.1
Comments
hth
The command works in Packet Tracer 6.2, but does not seem to work in a Cisco 2620 router with a simulated Version 12.2(2