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neutron connectivity between private networks

I am trying to setup neutron network as follows.

Admin project: net1 - shared (used host route to go to net2) router1 - connected to external network and gateway of net1 vm1 - connected to net1

user_poeject1: net2 - private router2 - connected to gateway of net2 and second IP on net1 vm2 - connected to net2

I can ping all the IPs in net2 from vm1.

but from vm2, I can ping only vm1 IP, not the gateway of net1 or external network IPs.

can you please let me know what is missing in this setup. why can't I go to external network from net2 via router2 -> router1 -> external network?

neutron connectivity between private networks

I am trying to setup neutron network using vlan as follows.

Admin project: net1 - shared (used host route to go to net2) router1 - connected to external network and gateway of net1 vm1 - connected to net1

user_poeject1: net2 - private router2 - connected to gateway of net2 and second IP on net1 vm2 - connected to net2

I can ping all the IPs in net2 from vm1.

but from vm2, I can ping only vm1 IP, not the gateway of net1 or external network IPs.

can you please let me know what is missing in this setup. why can't I go to external network from net2 via router2 -> router1 -> external network?