OSPF Simulator Lab Setup

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I have an example simulator problem with the following setup.

DEVICE INTERFACE IP ADDRESS SUBNET
---------------------------------------------------------------------------------------------------------------------------
Router 1 F0/0 24.17.2.1 255.255.255.240
S0/0 24.17.2.17 255.255.255.240

Router 2 F0/0 24.17.2.2 255.255.255.240

Router 4 S0/0 24.17.2.18 255.255.255.240

Now this lab was originally stated to set these interfaces with RIPv2 (to practice writing ACL later on). However, I wanted to use OSPF since I need to practice OSPF setup. However, I ran into problems.

I setup Router1 in global configuration mode with the following commands:
router ospf 100
router-id 1.1.1.1
network 24.17.2.0 0.0.0.15 area 0
end

I setup Router2 in global configuration mode with the following commands:
router ospf 100
router-id 2.2.2.2
network 24.17.2.0 0.0.0.15 area 0
end

I setup Router4 in global configuration mode with the following commands:
router ospf 100
router-id 4.4.4.4
network 24.17.2.0 0.0.0.15 area 0
end

The problem is that this configuration spews out errors from Router1 and Router2
Router1 error message:
OSPF: Detected router with duplicate router ID 2.2.2.2 in area 0

Router2 error message:
OSPF: Detected router with duplicate router ID 1.1.1.1 in area 0

Note: There are no error messages from Router4

I strongly suspect that it has to do with the IP addresses having the same class network. How do I work around this to complete an OSPF configuration? Again, this came from a question that originally posed these IP addresses to be used for RIP. Why can't I use this for OSPF?

Thanks,
hjimenez

 

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Sounds like best if you cleared all ospf config first and started afresh

If you type 'show ip ospf' on router 1 + 2, what appears?