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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>15.6. Using Multiple Guest 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="networks.html" title="Chapter 15. Managing Networks and Traffic" /><link rel="prev" href="advanced-zone-physical-network-configuration.html" title="15.5. Advanced Zone Physical Network Configuration" /><link rel="next" href="security-groups.html" title="15.7. Security Groups" /></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="advanced-zone-physical-network-configuration.html"><strong>Prev</strong></a></li><li class="next"><a accesskey="n" href="security-groups.html"><strong>Next</strong></a></li></ul><div xml:lang="en-US" class="section" id="using-multiple-guest-networks" lang="en-US"><div class="titlepage"><div><div><h2 class="title" id="using-multiple-guest-networks">15.6. Using Multiple Guest Networks</h2></div></div></div><div class="para">
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In zones that use advanced networking, additional networks for guest traffic may be added at any time after the initial installation. You can also customize the domain name associated with the network by specifying a DNS suffix for each network.
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</div><div class="para">
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A VM's networks are defined at VM creation time. A VM cannot add or remove networks after it has been created, although the user can go into the guest and remove the IP address from the NIC on a particular network.
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</div><div class="para">
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Each VM has just one default network. The virtual router's DHCP reply will set the guest's default gateway as that for the default network. Multiple non-default networks may be added to a guest in addition to the single, required default network. The administrator can control which networks are available as the default network.
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</div><div class="para">
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Additional networks can either be available to all accounts or be assigned to a specific account. Networks that are available to all accounts are zone-wide. Any user with access to the zone can create a VM with access to that network. These zone-wide networks provide little or no isolation between guests.Networks that are assigned to a specific account provide strong isolation.
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</div><div xml:lang="en-US" class="section" id="add-additional-guest-network" lang="en-US"><div class="titlepage"><div><div><h3 class="title" id="add-additional-guest-network">15.6.1. Adding an Additional Guest Network</h3></div></div></div><div class="orderedlist"><ol><li class="listitem"><div class="para">
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Log in to the CloudStack UI as an administrator or end user.
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</div></li><li class="listitem"><div class="para">
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In the left navigation, choose Network.
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</div></li><li class="listitem"><div class="para">
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Click Add guest network. Provide the following information:
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</div><div class="itemizedlist"><ul><li class="listitem"><div class="para">
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<span class="bold bold"><strong>Name</strong></span>: The name of the network. This will be user-visible.
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</div></li><li class="listitem"><div class="para">
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<span class="bold bold"><strong>Display Text</strong></span>: The description of the network. This will be user-visible.
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</div></li><li class="listitem"><div class="para">
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<span class="bold bold"><strong>Zone</strong></span>. The name of the zone this network applies to. Each zone is a broadcast domain, and therefore each zone has a different IP range for the guest network. The administrator must configure the IP range for each zone.
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</div></li><li class="listitem"><div class="para">
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<span class="bold bold"><strong>Network offering</strong></span>: If the administrator has configured multiple network offerings, select the one you want to use for this network.
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</div></li><li class="listitem"><div class="para">
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<span class="bold bold"><strong>Guest Gateway</strong></span>: The gateway that the guests should use.
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</div></li><li class="listitem"><div class="para">
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<span class="bold bold"><strong>Guest Netmask</strong></span>: The netmask in use on the subnet the guests will use.
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</div></li></ul></div></li><li class="listitem"><div class="para">
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Click Create.
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</div></li></ol></div></div><div xml:lang="en-US" class="section" id="change-network-offering-on-guest-network" lang="en-US"><div class="titlepage"><div><div><h3 class="title" id="change-network-offering-on-guest-network">15.6.2. Changing the Network Offering on a Guest Network</h3></div></div></div><div class="para">
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A user or administrator can change the network offering that is associated with an existing guest network.
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</div><div class="itemizedlist"><ul><li class="listitem"><div class="para">
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Log in to the CloudStack UI as an administrator or end user.
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</div></li><li class="listitem"><div class="para">
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If you are changing from a network offering that uses the CloudStack virtual router to one that uses external devices as network service providers, you must first stop all the VMs on the network. See Stopping and Starting VMs. Then return here and continue to the next step
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</div></li><li class="listitem"><div class="para">
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In the left navigation, choose Network
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</div></li><li class="listitem"><div class="para">
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Click the name of the network you want to modify
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<span class="inlinemediaobject"><img src="./images/edit-icon.png" alt="AttachDiskButton.png: button to attach a volume" /></span>
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.
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</div></li><li class="listitem"><div class="para">
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In Network Offering, choose the new network offering, then click Apply.
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</div></li><li class="listitem"><div class="para">
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A prompt appears asking whether you want to keep the existing CIDR. This is to let you know that if you change the network offering, the CIDR will be affected. Choose No to proceed with the change.
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</div></li><li class="listitem"><div class="para">
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Wait for the update to complete. Don’t try to restart VMs until after the network change is complete.
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</div></li><li class="listitem"><div class="para">
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If you stopped any VMs in step 2, restart them.
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</div></li></ul></div></div></div><ul class="docnav"><li class="previous"><a accesskey="p" href="advanced-zone-physical-network-configuration.html"><strong>Prev</strong>15.5. Advanced Zone Physical Network Configuration</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="security-groups.html"><strong>Next</strong>15.7. Security Groups</a></li></ul></body></html>
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