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diff --git a/docs/appendix/examples/ha.rst b/docs/appendix/examples/ha.rst deleted file mode 100644 index 702cb2b2..00000000 --- a/docs/appendix/examples/ha.rst +++ /dev/null @@ -1,580 +0,0 @@ -############################# -High Availability Walkthrough -############################# - -This document walks you through a complete HA setup of two VyOS machines. This -design is based on a VM as the primary router, and a physical machine as a -backup, using VRRP, BGP, OSPF and conntrack sharing. - -The aim of this document is to walk you through setting everything up so you -and up at a point where you can reboot any machine and not lose more than a few -seconds worth of connectivity. - -Design -====== - -This is based on a real life, in production design. One of the complex issues -is ensuring you have redundant data INTO your network. We do this with a pair -of Cisco Nexus switches, and using Virtual PortChannels that are spanned across -them. This as an added bonus, also allows for complete switch failure without -an outage. How you achieve this yourself is left as an exercise to the reader -but our setup is documented here. - -Walkthrough suggestion ----------------------- - -The ``commit`` command is implied after every section. If you make an error, -``commit`` will warn you and you can fix it before getting too far into things. -Please ensure you commit early and commit often. - -If you are following through this document, it is strongly suggested you -complete the entire document, ONLY doing the virtual router1 steps, and then -come back and walk through it AGAIN on the backup hardware router. - -This ensures you don't go to fast, or miss a step. However, it will make your -life easier to configure the fixed IP address and default route now on the -hardware router. - -Example Network ---------------- - -In this document, we have been allocated 203.0.113.0/24 by our upstream -provider, which we are publishing on VLAN100. - -They want us to establish a BGP session to their routers on 192.0.2.11 and -192.0.2.12 from our routers 192.0.2.21 and 192.0.2.22. They are AS 65550 and -we are AS65551. - -Our routers are going to have a floating IP address of 203.0.113.1, and use -.2 and .3 as their fixed IPs. - -We are going to use 10.200.201.0/24 for an 'internal' network on VLAN201. - -When traffic is originated from the 10.200.201.0/24 network, it will be -masqueraded to 203.0.113.1 - -For connection between sites, we are running a WireGuard link to two REMOTE -routers, and using OSPF over those links to distribute routes. That remote -site is expected to send traffic from anything in 10.201.0.0/16 - -VLANs ------ - -These are the vlans we wll be using: - -* 50: Upstream, using the 192.0.2.0/24 network allocated by them. -* 100: 'Public' network, using our 203.0.113.0/24 network. -* 201: 'Internal' network, using 10.200.201.0/24 - -Hardware --------- - -* switch1 (Nexus 10gb Switch) -* switch2 (Nexus 10gb Switch) -* compute1 (VMware ESXi 6.5) -* compute2 (VMware ESXi 6.5) -* compute3 (VMware ESXi 6.5) -* router2 (Random 1RU machine with 4 NICs) - -Note that router1 is a VM that runs on one of the compute nodes. - -Network Cabling ---------------- - -* From Datacenter - This connects into port 1 on both switches, and is tagged - as VLAN 50 -* Cisco VPC Crossconnect - Ports 39 and 40 bonded between each switch -* Hardware Router - Port 8 of each switch -* compute1 - Port 9 of each switch -* compute2 - Port 10 of each switch -* compute3 - Port 11 of each switch - -This is ignoring the extra Out-of-band management networking, which should be -on totally different switches, and a different feed into the rack, and is out -of scope of this. - -.. note:: Our implementation uses VMware's Distributed Port Groups, which allows - VMware to use LACP. This is a part of the ENTERPRISE licence, and is not - available on a Free licence. If you are implementing this and do not have - access to DPGs, you should not use VMware, and use some other virtualization - platform instead. - - -Basic Setup (via console) -========================= - -Create your router1 VM so it is able to withstand a VM Host failing, or a -network link failing. Using VMware, this is achieved by enabling vSphere DRS, -vSphere Availability, and creating a Distributed Port Group that uses LACP. - -Many other Hypervisors do this, and I'm hoping that this document will be -expanded to document how to do this for others. - -Create an 'All VLANs' network group, that passes all trunked traffic through -to the VM. Attach this network group to router1 as eth0. - -.. note:: VMware: You must DISABLE SECURITY on this Port group. Make sure that - ``Promiscuous Mode``\ , ``MAC address changes`` and ``Forged transmits`` are - enabled. All of these will be done as part of failover. - -Bonding on Hardware Router --------------------------- - -Create a LACP bond on the hardware router. We are assuming that eth0 and eth1 -are connected to port 8 on both switches, and that those ports are configured -as a Port-Channel. - -.. code-block:: none - - set interfaces bonding bond0 description 'Switch Port-Channel' - set interfaces bonding bond0 hash-policy 'layer2' - set interfaces bonding bond0 member interface 'eth0' - set interfaces bonding bond0 member interface 'eth1' - set interfaces bonding bond0 mode '802.3ad' - - -Assign external IP addresses ----------------------------- - -VLAN 100 and 201 will have floating IP addresses, but VLAN50 does not, as this -is talking directly to upstream. Create our IP address on vlan50. - -For the hardware router, replace ``eth0`` with ``bond0``. As (almost) every -command is identical, this will not be specified unless different things need -to be performed on different hosts. - -.. code-block:: none - - set interfaces ethernet eth0 vif 50 address '192.0.2.21/24' - -In this case, the hardware router has a different IP, so it would be - -.. code-block:: none - - set interfaces ethernet bond0 vif 50 address '192.0.2.22/24' - -Add (temporary) default route ------------------------------ - -It is assumed that the routers provided by upstream are capable of acting as a -default router, add that as a static route. - -.. code-block:: none - - set protocols static route 0.0.0.0/0 next-hop 192.0.2.11 - commit - save - - -Enable SSH ----------- - -Enable SSH so you can now SSH into the routers, rather than using the console. - -.. code-block:: none - - set service ssh - commit - save - -At this point you should be able to SSH into both of them, and will no longer -need access to the console (unless you break something!) - - -VRRP Configuration -================== - -We are setting up VRRP so that it does NOT fail back when a machine returns into -service, and it prioritizes router1 over router2. - -Internal Network ----------------- - -This has a floating IP address of 10.200.201.1/24, using virtual router ID 201. -The difference between them is the interface name, hello-source-address, and -peer-address. - -**router1** - -.. code-block:: none - - set interfaces ethernet eth0 vif 201 address 10.200.201.2/24 - set high-availability vrrp group int hello-source-address '10.200.201.2' - set high-availability vrrp group int interface 'eth0.201' - set high-availability vrrp group int peer-address '10.200.201.3' - set high-availability vrrp group int no-preempt - set high-availability vrrp group int priority '200' - set high-availability vrrp group int virtual-address '10.200.201.1/24' - set high-availability vrrp group int vrid '201' - - -**router2** - -.. code-block:: none - - set interfaces ethernet bond0 vif 201 address 10.200.201.3/24 - set high-availability vrrp group int hello-source-address '10.200.201.3' - set high-availability vrrp group int interface 'bond0.201' - set high-availability vrrp group int peer-address '10.200.201.2' - set high-availability vrrp group int no-preempt - set high-availability vrrp group int priority '100' - set high-availability vrrp group int virtual-address '10.200.201.1/24' - set high-availability vrrp group int vrid '201' - - -Public Network --------------- - -This has a floating IP address of 203.0.113.1/24, using virtual router ID 113. -The virtual router ID is just a random number between 1 and 254, and can be set -to whatever you want. Best practices suggest you try to keep them unique -enterprise-wide. - -**router1** - -.. code-block:: none - - set interfaces ethernet eth0 vif 100 address 203.0.113.2/24 - set high-availability vrrp group public hello-source-address '203.0.113.2' - set high-availability vrrp group public interface 'eth0.100' - set high-availability vrrp group public peer-address '203.0.113.3' - set high-availability vrrp group public no-preempt - set high-availability vrrp group public priority '200' - set high-availability vrrp group public virtual-address '203.0.113.1/24' - set high-availability vrrp group public vrid '113' - -**router2** - -.. code-block:: none - - set interfaces ethernet bond0 vif 100 address 203.0.113.3/24 - set high-availability vrrp group public hello-source-address '203.0.113.3' - set high-availability vrrp group public interface 'bond0.100' - set high-availability vrrp group public peer-address '203.0.113.2' - set high-availability vrrp group public no-preempt - set high-availability vrrp group public priority '100' - set high-availability vrrp group public virtual-address '203.0.113.1/24' - set high-availability vrrp group public vrid '113' - - -Create VRRP sync-group ----------------------- - -The sync group is used to replicate connection tracking. It needs to be assigned -to a random VRRP group, and we are creating a sync group called ``sync`` using -the vrrp group ``int``. - -.. code-block:: none - - set high-availability vrrp sync-group sync member 'int' - -Testing -------- - -At this point, you should be able to see both IP addresses when you run -``show interfaces``\ , and ``show vrrp`` should show both interfaces in MASTER -state (and SLAVE state on router2). - -.. code-block:: none - - vyos@router1:~$ show vrrp - Name Interface VRID State Last Transition - -------- ----------- ------ ------- ----------------- - int eth0.201 201 MASTER 100s - public eth0.100 113 MASTER 200s - vyos@router1:~$ - - -You should be able to ping to and from all the IPs you have allocated. - -NAT and conntrack-sync -====================== - -Masquerade Traffic originating from 10.200.201.0/24 that is heading out the -public interface. - -.. note:: We explicitly exclude the primary upstream network so that BGP or - OSPF traffic doesn't accidentally get NAT'ed. - -.. code-block:: none - - set nat source rule 10 destination address '!192.0.2.0/24' - set nat source rule 10 outbound-interface 'eth0.50' - set nat source rule 10 source address '10.200.201.0/24' - set nat source rule 10 translation address '203.0.113.1' - - -Configure conntrack-sync and disable helpers --------------------------------------------- - -Most conntrack modules cause more problems than they're worth, especially in a -complex network. Turn them off by default, and if you need to turn them on -later, you can do so. - -.. code-block:: none - - set system conntrack modules ftp disable - set system conntrack modules gre disable - set system conntrack modules nfs disable - set system conntrack modules pptp disable - set system conntrack modules sip disable - set system conntrack modules tftp disable - -Now enable replication between nodes. Replace eth0.201 with bond0.201 on the -hardware router. - -.. code-block:: none - - set service conntrack-sync accept-protocol 'tcp,udp,icmp' - set service conntrack-sync event-listen-queue-size '8' - set service conntrack-sync failover-mechanism vrrp sync-group 'sync' - set service conntrack-sync interface eth0.201 - set service conntrack-sync mcast-group '224.0.0.50' - set service conntrack-sync sync-queue-size '8' - -Testing -------- - -The simplest way to test is to look at the connection tracking stats on the -standby hardware router with the command ``show conntrack-sync statistics``. -The numbers should be very close to the numbers on the primary router. - -When you have both routers up, you should be able to establish a connection -from a NAT'ed machine out to the internet, reboot the active machine, and that -connection should be preserved, and will not drop out. - -OSPF Over WireGuard -=================== - -Wireguard doesn't have the concept of an up or down link, due to its design. -This complicates AND simplifies using it for network transport, as for reliable -state detection you need to use SOMETHING to detect when the link is down. - -If you use a routing protocol itself, you solve two problems at once. This is -only a basic example, and is provided as a starting point. - -Configure Wireguard -------------------- - -There is plenty of instructions and documentation on setting up Wireguard. The -only important thing you need to remember is to only use one WireGuard -interface per OSPF connection. - -We use small /30's from 10.254.60/24 for the point-to-point links. - -**router1** - -Replace the 203.0.113.3 with whatever the other router's IP address is. - -.. code-block:: none - - set interfaces wireguard wg01 address '10.254.60.1/30' - set interfaces wireguard wg01 description 'router1-to-offsite1' - set interfaces wireguard wg01 ip ospf authentication md5 key-id 1 md5-key 'i360KoCwUGZvPq7e' - set interfaces wireguard wg01 ip ospf cost '11' - set interfaces wireguard wg01 ip ospf dead-interval '5' - set interfaces wireguard wg01 ip ospf hello-interval '1' - set interfaces wireguard wg01 ip ospf network 'point-to-point' - set interfaces wireguard wg01 ip ospf priority '1' - set interfaces wireguard wg01 ip ospf retransmit-interval '5' - set interfaces wireguard wg01 ip ospf transmit-delay '1' - set interfaces wireguard wg01 peer OFFSITE1 allowed-ips '0.0.0.0/0' - set interfaces wireguard wg01 peer OFFSITE1 endpoint '203.0.113.3:50001' - set interfaces wireguard wg01 peer OFFSITE1 persistent-keepalive '15' - set interfaces wireguard wg01 peer OFFSITE1 pubkey 'GEFMOWzAyau42/HwdwfXnrfHdIISQF8YHj35rOgSZ0o=' - set interfaces wireguard wg01 port '50001' - - -**offsite1** - -This is connecting back to the STATIC IP of router1, not the floating. - -.. code-block:: none - - set interfaces wireguard wg01 address '10.254.60.2/30' - set interfaces wireguard wg01 description 'offsite1-to-router1' - set interfaces wireguard wg01 ip ospf authentication md5 key-id 1 md5-key 'i360KoCwUGZvPq7e' - set interfaces wireguard wg01 ip ospf cost '11' - set interfaces wireguard wg01 ip ospf dead-interval '5' - set interfaces wireguard wg01 ip ospf hello-interval '1' - set interfaces wireguard wg01 ip ospf network 'point-to-point' - set interfaces wireguard wg01 ip ospf priority '1' - set interfaces wireguard wg01 ip ospf retransmit-interval '5' - set interfaces wireguard wg01 ip ospf transmit-delay '1' - set interfaces wireguard wg01 peer ROUTER1 allowed-ips '0.0.0.0/0' - set interfaces wireguard wg01 peer ROUTER1 endpoint '192.0.2.21:50001' - set interfaces wireguard wg01 peer ROUTER1 persistent-keepalive '15' - set interfaces wireguard wg01 peer ROUTER1 pubkey 'CKwMV3ZaLntMule2Kd3G7UyVBR7zE8/qoZgLb82EE2Q=' - set interfaces wireguard wg01 port '50001' - -Test WireGuard --------------- - -Make sure you can ping 10.254.60.1 and .2 from both routers. - -Create Export Filter --------------------- - -We only want to export the networks we know we should be exporting. Always -whitelist your route filters, both importing and exporting. A good rule of -thumb is **'If you are not the default router for a network, don't advertise -it'**. This means we explicitly do not want to advertise the 192.0.2.0/24 -network (but do want to advertise 10.200.201.0 and 203.0.113.0, which we ARE -the default route for). This filter is applied to ``redistribute connected``. -If we WERE to advertise it, the remote machines would see 192.0.2.21 available -via their default route, establish the connection, and then OSPF would say -'192.0.2.0/24 is available via this tunnel', at which point the tunnel would -break, OSPF would drop the routes, and then 192.0.2.0/24 would be reachable via -default again. This is called 'flapping'. - -.. code-block:: none - - set policy access-list 150 description 'Outbound OSPF Redistribution' - set policy access-list 150 rule 10 action 'permit' - set policy access-list 150 rule 10 destination any - set policy access-list 150 rule 10 source inverse-mask '0.0.0.255' - set policy access-list 150 rule 10 source network '10.200.201.0' - set policy access-list 150 rule 20 action 'permit' - set policy access-list 150 rule 20 destination any - set policy access-list 150 rule 20 source inverse-mask '0.0.0.255' - set policy access-list 150 rule 20 source network '203.0.113.0' - set policy access-list 150 rule 100 action 'deny' - set policy access-list 150 rule 100 destination any - set policy access-list 150 rule 100 source any - - -Create Import Filter --------------------- - -We only want to import networks we know about. Our OSPF peer should only be -advertising networks in the 10.201.0.0/16 range. Note that this is an INVERSE -MATCH. You deny in access-list 100 to accept the route. - -.. code-block:: none - - set policy access-list 100 description 'Inbound OSPF Routes from Peers' - set policy access-list 100 rule 10 action 'deny' - set policy access-list 100 rule 10 destination any - set policy access-list 100 rule 10 source inverse-mask '0.0.255.255' - set policy access-list 100 rule 10 source network '10.201.0.0' - set policy access-list 100 rule 100 action 'permit' - set policy access-list 100 rule 100 destination any - set policy access-list 100 rule 100 source any - set policy route-map PUBOSPF rule 100 action 'deny' - set policy route-map PUBOSPF rule 100 match ip address access-list '100' - set policy route-map PUBOSPF rule 500 action 'permit' - - -Enable OSPF ------------ - -Every router **must** have a unique router-id. -The 'reference-bandwidth' is used because when OSPF was originally designed, -the idea of a link faster than 1gbit was unheard of, and it does not scale -correctly. - -.. code-block:: none - - set protocols ospf area 0.0.0.0 authentication 'md5' - set protocols ospf area 0.0.0.0 network '10.254.60.0/24' - set protocols ospf auto-cost reference-bandwidth '10000' - set protocols ospf log-adjacency-changes - set protocols ospf parameters abr-type 'cisco' - set protocols ospf parameters router-id '10.254.60.2' - set protocols ospf route-map PUBOSPF - - -Test OSPF ---------- - -When you have enabled OSPF on both routers, you should be able to see each -other with the command ``show ip ospf neighbour``. The state must be 'Full' -or '2-Way', if it is not then there is a network connectivity issue between the -hosts. This is often caused by NAT or MTU issues. You should not see any new -routes (unless this is the second pass) in the output of ``show ip route`` - -Advertise connected routes -========================== - -As a reminder, only advertise routes that you are the default router for. This -is why we are NOT announcing the 192.0.2.0/24 network, because if that was -announced into OSPF, the other routers would try to connect to that network -over a tunnel that connects to that network! - -.. code-block:: none - - set protocols ospf access-list 150 export 'connected' - set protocols ospf redistribute connected - - -You should now be able to see the advertised network on the other host. - -Duplicate configuration ------------------------ - -At this pont you now need to create the X link between all four routers. Use a -different /30 for each link. - -Priorities ----------- - -Set the cost on the secondary links to be 200. This means that they will not -be used unless the primary links are down. - -.. code-block:: none - - set interfaces wireguard wg01 ip ospf cost '10' - set interfaces wireguard wg02 ip ospf cost '200' - - -This will be visible in 'show ip route'. - -BGP -=== - -BGP is an extremely complex network protocol. An example is provided here. - -.. note:: Router id's must be unique. - -**router1** - - -The ``redistribute ospf`` command is there purely as an example of how this can -be expanded. In this walkthrough, it will be filtered by BGPOUT rule 10000, as -it is not 203.0.113.0/24. - -.. code-block:: none - - set policy prefix-list BGPOUT description 'BGP Export List' - set policy prefix-list BGPOUT rule 10 action 'deny' - set policy prefix-list BGPOUT rule 10 description 'Do not advertise short masks' - set policy prefix-list BGPOUT rule 10 ge '25' - set policy prefix-list BGPOUT rule 10 prefix '0.0.0.0/0' - set policy prefix-list BGPOUT rule 100 action 'permit' - set policy prefix-list BGPOUT rule 100 description 'Our network' - set policy prefix-list BGPOUT rule 100 prefix '203.0.113.0/24' - set policy prefix-list BGPOUT rule 10000 action 'deny' - set policy prefix-list BGPOUT rule 10000 prefix '0.0.0.0/0' - set policy route-map BGPOUT description 'BGP Export Filter' - set policy route-map BGPOUT rule 10 action 'permit' - set policy route-map BGPOUT rule 10 match ip address prefix-list 'BGPOUT' - set policy route-map BGPOUT rule 10000 action 'deny' - set policy route-map BGPPREPENDOUT description 'BGP Export Filter' - set policy route-map BGPPREPENDOUT rule 10 action 'permit' - set policy route-map BGPPREPENDOUT rule 10 set as-path-prepend '65551 65551 65551' - set policy route-map BGPPREPENDOUT rule 10 match ip address prefix-list 'BGPOUT' - set policy route-map BGPPREPENDOUT rule 10000 action 'deny' - set protocols bgp 65551 address-family ipv4-unicast network 192.0.2.0/24 - set protocols bgp 65551 address-family ipv4-unicast redistribute connected metric '50' - set protocols bgp 65551 address-family ipv4-unicast redistribute ospf metric '50' - set protocols bgp 65551 neighbor 192.0.2.11 address-family ipv4-unicast route-map export 'BGPOUT' - set protocols bgp 65551 neighbor 192.0.2.11 address-family ipv4-unicast soft-reconfiguration inbound - set protocols bgp 65551 neighbor 192.0.2.11 remote-as '65550' - set protocols bgp 65551 neighbor 192.0.2.11 update-source '192.0.2.21' - set protocols bgp 65551 parameters router-id '192.0.2.21' - - -**router2** - -This is identical, but you use the BGPPREPENDOUT route-map to advertise the -route with a longer path. |