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-.. _wan-load-balancing:
-
-WAN Load Balancer examples
-==========================
-
-
-Example 1: Distributing load evenly
------------------------------------
-
-The setup used in this example is shown in the following diagram:
-
-.. image:: /_static/images/Wan_load_balancing1.png
-   :width: 80%
-   :align: center
-   :alt: Network Topology Diagram
-
-
-Overview
-^^^^^^^^
- * All traffic coming in trough eth2 is balanced between eth0 and eth1
-   on the router.
- * Pings will be sent to four targets for health testing (33.44.55.66,
-   44.55.66.77, 55.66.77.88 and 66.77.88.99).
- * All outgoing packets are assigned the source address of the assigned
-   interface (SNAT).
- * eth0 is set to be removed from the load balancer's interface pool
-   after 5 ping failures, eth1 will be removed after 4 ping failures.
-
-Create static routes to ping targets
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-Create static routes through the two ISPs towards the ping targets and
-commit the changes:
-
-.. code-block:: none
-
-   set protocols static route 33.44.55.66/32 next-hop 11.22.33.1
-   set protocols static route 44.55.66.77/32 next-hop 11.22.33.1 
-   set protocols static route 55.66.77.88/32 next-hop 22.33.44.1
-   set protocols static route 66.77.88.99/32 next-hop 22.33.44.1
-
-Configure the load balancer
-^^^^^^^^^^^^^^^^^^^^^^^^^^^
-Configure the WAN load balancer with the parameters described above:
-
-.. code-block:: none
-
-   set load-balancing wan interface-health eth0 failure-count 5
-   set load-balancing wan interface-health eth0 nexthop 11.22.33.1
-   set load-balancing wan interface-health eth0 test 10 type ping
-   set load-balancing wan interface-health eth0 test 10 target 33.44.55.66
-   set load-balancing wan interface-health eth0 test 20 type ping
-   set load-balancing wan interface-health eth0 test 20 target 44.55.66.77
-   set load-balancing wan interface-health eth1 failure-count 4
-   set load-balancing wan interface-health eth1 nexthop 22.33.44.1
-   set load-balancing wan interface-health eth1 test 10 type ping
-   set load-balancing wan interface-health eth1 test 10 target 55.66.77.88
-   set load-balancing wan interface-health eth1 test 20 type ping
-   set load-balancing wan interface-health eth1 test 20 target 66.77.88.99
-   set load-balancing wan rule 10 inbound-interface eth2
-   set load-balancing wan rule 10 interface eth0
-   set load-balancing wan rule 10 interface eth1
-
-Example 2: Failover based on interface weights
-----------------------------------------------
-
-This examples uses the failover mode.
-
-Overview
-^^^^^^^^
-In this example eth0 is the primary interface and eth1 is the secondary
-interface to provide simple failover functionality. If eth0 fails, eth1
-takes over.
-
-Create interface weight based configuration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-The configuration steps are the same as in the previous example, except
-rule 10 so we keep the configuration, remove rule 10 and add a new rule
-for the failover mode:
-
-.. code-block:: none
-
-   delete load-balancing wan rule 10
-   set load-balancing wan rule 10 failover
-   set load-balancing wan rule 10 inbound-interface eth2
-   set load-balancing wan rule 10 interface eth0 weight 10
-   set load-balancing wan rule 10 interface eth1 weight 1
-
-Example 3: Failover based on rule order
----------------------------------------
-
-The previous example used the failover command to send traffic thorugh
-eth1 if eth0 fails. In this example failover functionality is provided
-by rule order.
-
-Overview
-^^^^^^^^
-Two rules will be created, the first rule directs traffic coming in
-from eth2 to eth0 and the second rule directs the traffic to eth1. If
-eth0 fails the first rule is bypassed and the second rule matches,
-directing traffic to eth1.
-
-Create rule order based configuration
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-We keep the configurtation from the previous example, delete rule 10
-and create the two new rules as described:
-
-.. code-block:: none
-
-   delete load-balancing wan rule 10
-   set load-balancing wan rule 10 inbound-interface eth2
-   set load-balancing wan rule 10 interface eth0
-   set load-balancing wan rule 20 inbound-interface eth2
-   set load-balancing wan rule 20 interface eth1
-
-Example 4: Failover based on rule order - priority traffic
-----------------------------------------------------------
-
-A rule order for prioritising traffic is useful in scenarios where the
-secondary link has a lower speed and should only carry high priority
-traffic. It is assumed for this example that eth1 is connected to a
-slower connection than eth0 and should prioritise VoIP traffic.
-
-Overview
-^^^^^^^^
-A rule order for prioritising traffic is useful in scenarios where the
-secondary link has a lower speed and should only carry high priority
-traffic. It is assumed for this example that eth1 is connected to a
-slower connection than eth0 and should prioritise VoIP traffic. 
-
-Create rule order based configuration with low speed secondary link
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-We keep the configuration from the previous example, delete rule 20 and
-create a new rule as described: 
-
-.. code-block:: none
-
-   delete load-balancing wan rule 20
-   set load-balancing wan rule 20 inbound-interface eth2
-   set load-balancing wan rule 20 interface eth1
-   set load-balancing wan rule 20 destination port sip
-   set load-balancing wan rule 20 protocol tcp
-   set protocols static route 0.0.0.0/0 next-hop 11.22.33.1
-
-Example 5: Exclude traffic from load balancing
-----------------------------------------------
-
-In this example two LAN interfaces exist in different subnets instead
-of one like in the previous examples:
-
-.. image:: /_static/images/Wan_load_balancing_exclude1.png                      
-   :width: 80%                                                          
-   :align: center                                                       
-   :alt: Network Topology Diagram 
-
-Adding a rule for the second interface
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-Based on the previous example, another rule for traffic from the second
-interface eth3 can be added to the load balancer. However, traffic meant
-to flow between the LAN subnets will be sent to eth0 and eth1 as well.
-To prevent this, another rule is required. This rule excludes traffic
-between the local subnets from the load balancer. It also excludes
-locally-sources packets (required for web caching with load balancing).
-eth+ is used as an alias that refers to all ethernet interfaces:
-
-.. code-block:: none
-
-   set load-balancing wan rule 5 exclude
-   set load-balancing wan rule 5 inbound-interface eth+
-   set load-balancing wan rule 5 destination address 10.0.0.0/8