cloudstack/docs/en-US/configure-acl.xml

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<section id="configure-acl">
  <title>Configuring Access Control List</title>
  <para>Define Network Access Control List (ACL) on the VPC virtual router to control incoming
    (ingress) and outgoing (egress) traffic between the VPC tiers, and the tiers and Internet. By
    default, all incoming and outgoing traffic to the guest networks is blocked. To open the ports,
    you must create a new network ACL. The network ACLs can be created for the tiers only if the
    NetworkACL service is supported.</para>
  <orderedlist>
    <listitem>
      <para>Log in to the &PRODUCT; UI as an administrator or end user.</para>
    </listitem>
    <listitem>
      <para>In the left navigation, choose Network.</para>
    </listitem>
    <listitem>
      <para>In the Select view, select VPC.</para>
      <para>All the VPCs that you have created for the account is listed in the page.</para>
    </listitem>
    <listitem>
      <para>Click the Configure button of the VPC, for which you want to configure load balancing
        rules.</para>
      <para>For each tier, the following options are displayed:</para>
      <itemizedlist>
        <listitem>
          <para>Internal LB</para>
        </listitem>
        <listitem>
          <para>Public LB IP</para>
        </listitem>
        <listitem>
          <para>Static NAT</para>
        </listitem>
        <listitem>
          <para>Virtual Machines</para>
        </listitem>
        <listitem>
          <para>CIDR</para>
        </listitem>
      </itemizedlist>
      <para>The following router information is displayed:</para>
      <itemizedlist>
        <listitem>
          <para>Private Gateways</para>
        </listitem>
        <listitem>
          <para>Public IP Addresses</para>
        </listitem>
        <listitem>
          <para>Site-to-Site VPNs</para>
        </listitem>
        <listitem>
          <para>Network ACL Lists</para>
        </listitem>
      </itemizedlist>
    </listitem>
    <listitem>
      <para>Select Network ACL Lists.</para>
      <para>The following default rules are displayed in the Network ACLs page: default_allow,
        default_deny.</para>
    </listitem>
    <listitem>
      <para>Click Add ACL Lists, and specify the following:</para>
      <itemizedlist>
        <listitem>
          <para><emphasis role="bold">ACL List Name</emphasis>: A name for the ACL list.</para>
        </listitem>
        <listitem>
          <para><emphasis role="bold">Description</emphasis>: A short description of the ACL list
            that can be displayed to users.</para>
        </listitem>
      </itemizedlist>
    </listitem>
    <listitem>
      <para>Select the ACL list.</para>
    </listitem>
    <listitem>
      <para>Select the ACL List Rules tab.</para>
      <para>To add an ACL rule, fill in the following fields to specify what kind of network traffic
        is allowed in the VPC. </para>
      <itemizedlist>
        <listitem>
          <para><emphasis role="bold">CIDR</emphasis>: The CIDR acts as the Source CIDR for the
            Ingress rules, and Destination CIDR for the Egress rules. To accept traffic only from or
            to the IP addresses within a particular address block, enter a CIDR or a comma-separated
            list of CIDRs. The CIDR is the base IP address of the incoming traffic. For example,
            192.168.0.0/22. To allow all CIDRs, set to 0.0.0.0/0.</para>
        </listitem>
        <listitem>
          <para><emphasis role="bold">Protocol</emphasis>: The networking protocol that sources use
            to send traffic to the tier. The TCP and UDP protocols are typically used for data
            exchange and end-user communications. The ICMP protocol is typically used to send error
            messages or network monitoring data. All supports all the traffic. Other option is
            Protocol Number.</para>
        </listitem>
        <listitem>
          <para><emphasis role="bold">Start Port</emphasis>, <emphasis role="bold">End
              Port</emphasis> (TCP, UDP only): A range of listening ports that are the destination
            for the incoming traffic. If you are opening a single port, use the same number in both
            fields.</para>
        </listitem>
        <listitem>
          <para><emphasis role="bold">Protocol Number</emphasis>: The protocol number associated
            with IPv4 or IPv6. For more information, see <ulink
              url="http://www.iana.org/assignments/protocol-numbers/protocol-numbers.xml">Protocol
              Numbers</ulink>.</para>
        </listitem>
        <listitem>
          <para><emphasis role="bold">ICMP Type</emphasis>, <emphasis role="bold">ICMP
              Code</emphasis> (ICMP only): The type of message and error code that will be
            sent.</para>
        </listitem>
        <listitem>
          <para><emphasis role="bold">Action</emphasis>: What action to be taken. </para>
        </listitem>
      </itemizedlist>
    </listitem>
    <listitem>
      <para>Click Add. The ACL rule is added.</para>
      <para>You can edit the tags assigned to the ACL rules and delete the ACL rules you have
        created. Click the appropriate button in the Details tab.</para>
    </listitem>
  </orderedlist>
</section>