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47 lines
2.4 KiB
XML
47 lines
2.4 KiB
XML
<?xml version='1.0' encoding='utf-8' ?>
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<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/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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<!-- Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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<section id="ongoing-config-of-external-firewalls-ld">
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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
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firewall and load balancer. A user may request additional public IP addresses and forward
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traffic received at these IPs to specific VMs. This is accomplished by enabling static NAT for a
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public IP address, assigning the IP to a VM, and specifying a set of protocols and port ranges
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to open. When a static NAT rule is created, &PRODUCT; programs the zone's external firewall with
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the following objects:</para>
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<itemizedlist>
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<listitem>
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<para>A static NAT rule that maps the public IP address to the private IP address of a
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VM.</para>
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</listitem>
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<listitem>
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<para>A security policy that allows traffic within the set of protocols and port ranges that
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are specified.</para>
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</listitem>
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<listitem>
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<para>A firewall filter counter that measures the number of bytes of incoming traffic to the
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public IP.</para>
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</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
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rules is measured and saved on each external element. This data is collected on a regular basis
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and stored in the &PRODUCT; database.</para>
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</section>
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