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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>9.2. About Virtual Networks</title><link rel="stylesheet" type="text/css" href="Common_Content/css/default.css" /><link rel="stylesheet" media="print" href="Common_Content/css/print.css" type="text/css" /><meta name="generator" content="publican 2.8" /><meta name="package" content="Apache_CloudStack-Admin_Guide-4.0.0-incubating-en-US-1-" /><link rel="home" href="index.html" title="CloudStack Administrator's Guide" /><link rel="up" href="set-up-network-for-users.html" title="Chapter 9. Setting Up Networking for Users" /><link rel="prev" href="networks-for-users-overview.html" title="9.1. Overview of Setting Up Networking for Users" /><link rel="next" href="network-service-providers.html" title="9.3. Network Service Providers" /></head><body><p id="title"><a class="left" href="http://cloudstack.org"><img src="Common_Content/images/image_left.png" alt="Product Site" /></a><a class="right" href="http://docs.cloudstack.org"><img src="Common_Content/images/image_right.png" alt="Documentation Site" /></a></p><ul class="docnav"><li class="previous"><a accesskey="p" href="networks-for-users-overview.html"><strong>Prev</strong></a></li><li class="next"><a accesskey="n" href="network-service-providers.html"><strong>Next</strong></a></li></ul><div xml:lang="en-US" class="section" id="about-virtual-networks" lang="en-US"><div class="titlepage"><div><div><h2 class="title" id="about-virtual-networks">9.2. About Virtual Networks</h2></div></div></div><div class="para">
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A virtual network is a logical construct that enables multi-tenancy on a single physical network. In CloudStack a virtual network can be shared or isolated.
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</div><div xml:lang="en-US" class="section" id="isolated-networks" lang="en-US"><div class="titlepage"><div><div><h3 class="title" id="isolated-networks">9.2.1. Isolated Networks</h3></div></div></div><div class="para">
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An isolated network can be accessed only by virtual machines of a single account. Isolated networks have the following properties.
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Resources such as VLAN are allocated and garbage collected dynamically
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</div></li><li class="listitem"><div class="para">
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There is one network offering for the entire network
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</div></li><li class="listitem"><div class="para">
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The network offering can be upgraded or downgraded but it is for the entire network
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</div></li></ul></div></div><div xml:lang="en-US" class="section" id="shared-networks" lang="en-US"><div class="titlepage"><div><div><h3 class="title" id="shared-networks">9.2.2. Shared Networks</h3></div></div></div><div class="para">
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A shared network can be accessed by virtual machines that belong to many different accounts. Network Isolation on shared networks is accomplished using techniques such as security groups (supported only in basic zones in CloudStack 3.0.3).
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</div><div class="itemizedlist"><ul><li class="listitem"><div class="para">
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Shared Networks are created by the administrator
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</div></li><li class="listitem"><div class="para">
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Shared Networks can be designated to a certain domain
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</div></li><li class="listitem"><div class="para">
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Shared Network resources such as VLAN and physical network that it maps to are designated by the administrator
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</div></li><li class="listitem"><div class="para">
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Shared Networks are isolated by security groups
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</div></li><li class="listitem"><div class="para">
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Public Network is a shared network that is not shown to the end users
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</div></li></ul></div></div><div xml:lang="en-US" class="section" id="runtime-allocation-virtual-network-resources" lang="en-US"><div class="titlepage"><div><div><h3 class="title" id="runtime-allocation-virtual-network-resources">9.2.3. Runtime Allocation of Virtual Network Resources</h3></div></div></div><div class="para">
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When you define a new virtual network, all your settings for that network are stored in CloudStack. The actual network resources are activated only when the first virtual machine starts in the network. When all virtual machines have left the virtual network, the network resources are garbage collected so they can be allocated again. This helps to conserve network resources..
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</div></div></div><ul class="docnav"><li class="previous"><a accesskey="p" href="networks-for-users-overview.html"><strong>Prev</strong>9.1. Overview of Setting Up Networking for Users</a></li><li class="up"><a accesskey="u" href="#"><strong>Up</strong></a></li><li class="home"><a accesskey="h" href="index.html"><strong>Home</strong></a></li><li class="next"><a accesskey="n" href="network-service-providers.html"><strong>Next</strong>9.3. Network Service Providers</a></li></ul></body></html>
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