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What do we mean by public and private ips?

asked 2014-01-30 09:52:06 -0500

John Smith gravatar image

Currently my network is at the office is setup with private ips of 10.0.0.xxx IPs.

I installed devstack on a 32 core server machine for testing. That machine is 10.0.0.123 all the openstack service are bound to that I.P

My network admin has alowed me to run instances on 10.0.0.22.xxx ranges. How do I change that? Right now I have instances create don 10.0.0.2 and 10.0.0.3 and can't access them....

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answered 2014-01-30 11:07:53 -0500

dheeru gravatar image

First this questions and ans is not related to OpenStack. This is purely networking fundamentals. Private network is subnet created for vms to communicate each other in that subnet. E.g 10.0.0.x is your internal IP address.

Public IP address is for IP address assigned to vm which is accessible from out side the vm network. E.g you may have external network with 192.168.0.x as network for your desktops. This IP can be assigned to your vms. In this case vm is also accessible from outside. This is public network. It is as good as your vm having two interfaces with two different IP addresss. One IP address is internal network. Other one is external network.

Hope this clarifies.

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Asked: 2014-01-30 09:52:06 -0500

Seen: 109 times

Last updated: Jan 30 '14