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--Case A--

1.Create one vpc network(net-10-232-0-0) with two subnetworks(10.232.20.0/24 and 10.232.30.0/24)

2.Create two VM instances with internal IPs(10.232.20.21 and 10.232.30.31)

3.Create ingress/engress firewall rules

both vm instances can access(ping) each other.

.

--Case B--

1.Create two vpc network(net-10-232-20-0 and net-10-232-30-0) with two subnetworks(10.232.20.0/24 and 10.232.30.0/24)

2.Create two VM instances with internal IPs(10.232.20.21 and 10.232.30.31)

3.Create ingress/engress firewall rules

both vm instances can not access(ping) each other.

.

is there something missed?!

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No, this is an expected behavior.

Two VPCs are different networks and isolates their resources, that's the point of a VPC.

If you need to connect resources from different VPCs, you may need a VPC peering.

In addition, your question is well explained in the documentation.

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