Fix the static routes
Someone set up static routes across the three sites, but PC1 can't reach PC3 and it can't reach the 172.16.2.1 loopback on R2 either. Find and fix every fault. Keep the design: default routes on R1 and R3, one route per LAN on R2.
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Solution explanation
Three faults. R1's default route pointed to 10.0.12.6, which isn't on R1's 10.0.12.0/30 link, so the route was never installed (show ip route static showed nothing). R2's route for PC3's LAN had a typo: 192.168.30.0 instead of 192.168.3.0. And R3 had no route at all, so PC3 couldn't reply: the ping to PC3 failed even after R1 and R2 were fixed.
Show solution
[PC1]
tracert 172.16.2.1
[R1]
enable
show ip route static
show ip route 172.16.2.1
configure terminal
no ip route 0.0.0.0 0.0.0.0 10.0.12.6
ip route 0.0.0.0 0.0.0.0 10.0.12.2
end
[PC1]
ping 172.16.2.1
ping 192.168.3.10
[R2]
enable
show ip route static
configure terminal
no ip route 192.168.30.0 255.255.255.0 10.0.23.2
ip route 192.168.3.0 255.255.255.0 10.0.23.2
end
[R3]
enable
show ip route
configure terminal
ip route 0.0.0.0 0.0.0.0 10.0.23.1
end
[PC1]
ping 192.168.3.10