Hello
What are you trying to achieve, It looks like your advertising the internal network 10.1.0.0/24 from rtr0 via ospf so why do you want to NAT that subnet, I would say if you want to use nat then this subnet should be advertised externally
However saying with NAT enabled on RTR0 I cannot reach the networks residing in RTR2 sourced from the the egress interface of RTR1 and you should be able to even with NAT applied, so I would say this is a quirk in the PT software which is not good at the best of times to simulate networks.
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Kind Regards
Paul
