How can I ping the default gateway from PC2?
I have tried
IP <address> [/<mask>] [<gateway>] command for R1, but is says "not in subnet".
And when I tried the same command for R3, it works but I still can't ping R1 and I don't know why.
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Check the routing tables on these devices to confirm these routes exist.
Configure a host route on your PC telling it that the PC's default gateway is R3.