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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 Settings icon.</para>
<para>The following options are displayed.</para>
<itemizedlist>
<listitem>
<para>IP Addresses</para>
</listitem>
<listitem>
<para>Gateways</para>
</listitem>
<listitem>
<para>Site-to-Site VPN</para>
</listitem>
<listitem>
<para>Network ACLs</para>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>Select Network ACLs.</para>
<para>The Network ACLs page is displayed.</para>
</listitem>
<listitem>
<para>Click Add Network ACLs.</para>
<para>To add an ACL rule, fill in the following fields to specify what kind of network traffic
is allowed in this tier. </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.</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">Select Tier</emphasis>: Select the tier for which you want to
add this ACL rule.</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">Traffic Type</emphasis>: Select the traffic type you want to
apply. </para>
<itemizedlist>
<listitem>
<para><emphasis role="bold">Egress</emphasis>: To add an egress rule, select Egress
from the Traffic type drop-down box and click Add. This specifies what type of
traffic is allowed to be sent out of VM instances in this tier. If no egress rules
are specified, all traffic from the tier is allowed out at the VPC virtual router.
Once egress rules are specified, only the traffic specified in egress rules and the
responses to any traffic that has been allowed in through an ingress rule are
allowed out. No egress rule is required for the VMs in a tier to communicate with
each other.</para>
</listitem>
<listitem>
<para><emphasis role="bold">Ingress</emphasis>: To add an ingress rule, select Ingress
from the Traffic type drop-down box and click Add. This specifies what network
traffic is allowed into the VM instances in this tier. If no ingress rules are
specified, then no traffic will be allowed in, except for responses to any traffic
that has been allowed out through an egress rule.</para>
</listitem>
</itemizedlist>
<note>
<para>By default, all incoming and outgoing traffic to the guest networks is blocked. To
open the ports, create a new network ACL.</para>
</note>
</listitem>
</itemizedlist>
</listitem>
<listitem>
<para>Click Add. The ACL rule is added.</para>
<para>To view the list of ACL rules you have added, click the desired tier from the Network
ACLs page, then select the Network ACL tab.</para>
<mediaobject>
<imageobject>
<imagedata fileref="./images/network-acl.png"/>
</imageobject>
<textobject>
<phrase>network-acl.png: adding, editing, deleting an ACL rule.</phrase>
</textobject>
</mediaobject>
<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 Actions column.</para>
</listitem>
</orderedlist>
</section>