Stackoverflow is about code development, not IT management. serverfault.com would be a more appropriate forum, or perhaps superuser.com.
microstack "fakes" the external network. It's not really external, but only exists on br-ex
, the external bridge. It doesn't look like you can create a microstack cloud with a different external network CIDR, but you can try adding a subnet to the external network, inserting ens33
in br-ex
and adding IP address 172.21.10.13 to br-ex
. I have not tried this.
However, if your only requirement is to access the instance from the PC, you can create a tunnel or add a route. What makes sense in your case depends on the virtual machine hypervisor you are using (yours seems to be VMware - I can't comment on that) and the operating system on which this hypervisor runs.
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