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.. _routing-pbr:
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PBR
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---
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:abbr:`PBR (Policy-Based Routing)` allowing traffic to be assigned to different
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routing tables. Traffic can be matched using standard 5-tuple matching (source
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address, destination address, protocol, source port, destination port).
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Transparent Proxy
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^^^^^^^^^^^^^^^^^
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The following example will show how VyOS can be used to redirect web traffic to
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an external transparent proxy:
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.. code-block:: console
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set policy route FILTER-WEB rule 1000 destination port 80
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set policy route FILTER-WEB rule 1000 protocol tcp
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set policy route FILTER-WEB rule 1000 set table 100
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This creates a route policy called FILTER-WEB with one rule to set the routing
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table for matching traffic (TCP port 80) to table ID 100 instead of the
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default routing table.
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To create routing table 100 and add a new default gateway to be used by
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traffic matching our route policy:
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.. code-block:: console
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set protocols static table 100 route 0.0.0.0/0 next-hop 10.255.0.2
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This can be confirmed using the show ip route table 100 operational command.
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Finally, to apply the policy route to ingress traffic on our LAN interface,
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we use:
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.. code-block:: console
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set interfaces ethernet eth1 policy route FILTER-WEB
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Multiple Uplinks
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^^^^^^^^^^^^^^^^
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VyOS Policy-Based Routing (PBR) works by matching source IP address ranges and
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forwarding the traffic using different routing tables.
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Routing tables that will be used in this example are:
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* ``table 10`` Routing tabled used for VLAN 10 (192.168.188.0/24)
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* ``table 11`` Routing tabled used for VLAN 11 (192.168.189.0/24)
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* ``main`` Routing table used by VyOS and other interfaces not paritipating in
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PBR
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.. figure:: ../_static/images/pbr_example_1.png
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:scale: 80 %
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:alt: PBR multiple uplinks
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Policy-Based Routing with multiple ISP uplinks
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(source ./draw.io/pbr_example_1.drawio)
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Add default routes for routing ``table 10`` and ``table 11``
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.. code-block:: console
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set protocols static table 10 route 0.0.0.0/0 next-hop 192.0.1.1
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set protocols static table 11 route 0.0.0.0/0 next-hop 192.0.2.2
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Add policy route matching VLAN source addresses
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.. code-block:: console
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set policy route PBR rule 20 set table '10'
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set policy route PBR rule 20 description 'Route VLAN10 traffic to table 10'
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set policy route PBR rule 20 source address '192.168.188.0/24'
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set policy route PBR rule 30 set table '11'
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set policy route PBR rule 30 description 'Route VLAN11 traffic to table 11'
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set policy route PBR rule 30 source address '192.168.189.0/24'
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Apply routing policy to **inbound** direction of out VLAN interfaces
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.. code-block:: console
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set interfaces ethernet eth0 vif 10 policy route 'PBR'
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set interfaces ethernet eth0 vif 11 policy route 'PBR'
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**OPTIONAL:** Exclude Inter-VLAN traffic (between VLAN10 and VLAN11) from PBR
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.. code-block:: console
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set policy route PBR rule 10 description 'VLAN10 <-> VLAN11 shortcut'
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set policy route PBR rule 10 destination address '192.168.188.0/24'
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set policy route PBR rule 10 destination address '192.168.189.0/24'
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set policy route PBR rule 10 set table 'main'
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.. note:: Allows the VLAN10 and VLAN20 hosts to communicate with each other
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using the main routing table. |