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16 lines
1.6 KiB
XML
16 lines
1.6 KiB
XML
<?xml version='1.0' encoding='utf-8' ?>
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<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "file:///C:/Program%20Files%20(x86)/Publican/DocBook_DTD/docbookx.dtd" [
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<!ENTITY % BOOK_ENTITIES SYSTEM "cloudstack.ent">
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%BOOK_ENTITIES;
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]>
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<section id="ongoing-configuration-of-external-firewalls-loadbalancer">
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<title>Ongoing Configuration of External Firewalls and Load Balancers</title>
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<para>Additional user actions (e.g. setting a port forward) will cause further programming of the firewall and load balancer. A user may request additional public IP addresses and forward traffic received at these IPs to specific VMs. This is accomplished by enabling static NAT for a public IP address, assigning the IP to a VM, and specifying a set of protocols and port ranges to open. When a static NAT rule is created, CloudPlatform programs the zone's external firewall with the following objects:</para>
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<itemizedlist>
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<listitem><para>A static NAT rule that maps the public IP address to the private IP address of a VM.</para></listitem>
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<listitem><para>A security policy that allows traffic within the set of protocols and port ranges that are specified.</para></listitem>
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<listitem><para>A firewall filter counter that measures the number of bytes of incoming traffic to the public IP.</para></listitem>
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</itemizedlist>
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<para>The number of incoming and outgoing bytes through source NAT, static NAT, and load balancing rules is measured and saved on each external element. This data is collected on a regular basis and stored in the CloudPlatform database.</para>
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</section>
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