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diff --git a/docs/configuration/policy/index.rst b/docs/configuration/policy/index.rst new file mode 100644 index 00000000..4b7d48ee --- /dev/null +++ b/docs/configuration/policy/index.rst @@ -0,0 +1,205 @@ +.. include:: /_include/need_improvement.txt + +###### +Policy +###### + +Routing Policies could be used to tell the router (self or neighbors) what +routes and their attributes needs to be put into the routing table. + +There could be a wide range of routing policies. Some examples are below: + +* Set some metric to routes learned from a particular neighbor +* Set some attributes (like AS PATH or Community value) to advertised routes to neighbors +* Prefer a specific routing protocol routes over another routing protocol running on the same router + +Example +======= + +**Policy definition:** + +.. code-block:: none + + # Create policy + set policy route-map setmet rule 2 action 'permit' + set policy route-map setmet rule 2 set as-path-prepend '2 2 2' + + # Apply policy to BGP + set protocols bgp 1 neighbor 203.0.113.2 address-family ipv4-unicast route-map import 'setmet' + set protocols bgp 1 neighbor 203.0.113.2 address-family ipv4-unicast soft-reconfiguration 'inbound' + +Using 'soft-reconfiguration' we get the policy update without bouncing the +neighbor. + +**Routes learned before routing policy applied:** + +.. code-block:: none + + vyos@vos1:~$ show ip bgp + BGP table version is 0, local router ID is 192.168.56.101 + Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, + r RIB-failure, S Stale, R Removed + Origin codes: i - IGP, e - EGP, ? - incomplete + + Network Next Hop Metric LocPrf Weight Path + *> 198.51.100.3/32 203.0.113.2 1 0 2 i < Path + + Total number of prefixes 1 + +**Routes learned after routing policy applied:** + +.. code-block:: none + + vyos@vos1:~$ sho ip b + BGP table version is 0, local router ID is 192.168.56.101 + Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, + r RIB-failure, S Stale, R Removed + Origin codes: i - IGP, e - EGP, ? - incomplete + + Network Next Hop Metric LocPrf Weight Path + *> 198.51.100.3/32 203.0.113.2 1 0 2 2 2 2 i + + Total number of prefixes 1 + vyos@vos1:~$ + +You now see the longer AS path. + + +.. include:: /_include/need_improvement.txt + +.. _routing-pbr: + +### +PBR +### + +:abbr:`PBR (Policy-Based Routing)` allowing traffic to be assigned to +different routing tables. Traffic can be matched using standard 5-tuple +matching (source address, destination address, protocol, source port, +destination port). + +Transparent Proxy +================= + +The following example will show how VyOS can be used to redirect web +traffic to an external transparent proxy: + +.. code-block:: none + + set policy route FILTER-WEB rule 1000 destination port 80 + set policy route FILTER-WEB rule 1000 protocol tcp + set policy route FILTER-WEB rule 1000 set table 100 + +This creates a route policy called FILTER-WEB with one rule to set the +routing table for matching traffic (TCP port 80) to table ID 100 +instead of the default routing table. + +To create routing table 100 and add a new default gateway to be used by +traffic matching our route policy: + +.. code-block:: none + + set protocols static table 100 route 0.0.0.0/0 next-hop 10.255.0.2 + +This can be confirmed using the ``show ip route table 100`` operational +command. + +Finally, to apply the policy route to ingress traffic on our LAN +interface, we use: + +.. code-block:: none + + set interfaces ethernet eth1 policy route FILTER-WEB + + +Multiple Uplinks +================ + +VyOS Policy-Based Routing (PBR) works by matching source IP address +ranges and forwarding the traffic using different routing tables. + +Routing tables that will be used in this example are: + +* ``table 10`` Routing table used for VLAN 10 (192.168.188.0/24) +* ``table 11`` Routing table used for VLAN 11 (192.168.189.0/24) +* ``main`` Routing table used by VyOS and other interfaces not + participating in PBR + +.. figure:: /_static/images/pbr_example_1.png + :scale: 80 % + :alt: PBR multiple uplinks + + Policy-Based Routing with multiple ISP uplinks + (source ./draw.io/pbr_example_1.drawio) + +Add default routes for routing ``table 10`` and ``table 11`` + +.. code-block:: none + + set protocols static table 10 route 0.0.0.0/0 next-hop 192.0.1.1 + set protocols static table 11 route 0.0.0.0/0 next-hop 192.0.2.2 + +Add policy route matching VLAN source addresses + +.. code-block:: none + + set policy route PBR rule 20 set table '10' + set policy route PBR rule 20 description 'Route VLAN10 traffic to table 10' + set policy route PBR rule 20 source address '192.168.188.0/24' + + set policy route PBR rule 30 set table '11' + set policy route PBR rule 30 description 'Route VLAN11 traffic to table 11' + set policy route PBR rule 30 source address '192.168.189.0/24' + +Apply routing policy to **inbound** direction of out VLAN interfaces + +.. code-block:: none + + set interfaces ethernet eth0 vif 10 policy route 'PBR' + set interfaces ethernet eth0 vif 11 policy route 'PBR' + + +**OPTIONAL:** Exclude Inter-VLAN traffic (between VLAN10 and VLAN11) +from PBR + +.. code-block:: none + + set policy route PBR rule 10 description 'VLAN10 <-> VLAN11 shortcut' + set policy route PBR rule 10 destination address '192.168.188.0/24' + set policy route PBR rule 10 destination address '192.168.189.0/24' + set policy route PBR rule 10 set table 'main' + +These commands allow the VLAN10 and VLAN20 hosts to communicate with +each other using the main routing table. + +Local route +=========== + +The following example allows VyOS to use :abbr:`PBR (Policy-Based Routing)` for traffic, which originated from the router itself. +That solution for multiple ISP's and VyOS router will respond from the same interface that the packet was received. +Also, it used, if we want that one VPN tunnel to be through one provider, and the second through another. + +* ``192.168.1.254`` IP addreess on VyOS eth1 from ISP1 +* ``192.168.2.254`` IP addreess on VyOS eth2 from ISP2 +* ``table 10`` Routing table used for ISP1 +* ``table 11`` Routing table used for ISP2 + + +.. code-block:: none + + set policy local-route rule 101 set table '10' + set policy local-route rule 101 source '192.0.1.254' + set policy local-route rule 102 set table '11' + set policy local-route rule 102 source '192.0.2.254' + set protocols static table 10 route '0.0.0.0/0' next-hop '192.0.1.1' + set protocols static table 11 route '0.0.0.0/0' next-hop '192.0.2.2' + +Add multiple source IP in one rule with same priority + +.. code-block:: none + + set policy local-route rule 101 set table '10' + set policy local-route rule 101 source '192.0.1.254' + set policy local-route rule 101 source '192.0.1.253' + set policy local-route rule 101 source '203.0.113.0/24' + |