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164 lines
6.8 KiB
ReStructuredText
164 lines
6.8 KiB
ReStructuredText
:lastproofread: 2021-06-28
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.. _examples-azure-vpn-dual-bgp:
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Route-Based Redundant Site-to-Site VPN to Azure (BGP over IKEv2/IPsec)
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----------------------------------------------------------------------
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This guide shows an example of a redundant (active-active) route-based IKEv2
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site-to-site VPN to Azure using VTI
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and BGP for dynamic routing updates.
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Prerequisites
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^^^^^^^^^^^^^
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- A pair of Azure VNet Gateways deployed in active-active
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configuration with BGP enabled.
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- A local network gateway deployed in Azure representing
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the Vyos device, matching the below Vyos settings except for
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address space, which only requires the Vyos private IP, in
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this example 10.10.0.5/32
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- A connection resource deployed in Azure linking the
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Azure VNet gateway and the local network gateway representing
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the Vyos device.
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Example
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^^^^^^^
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+---------------------------------------+---------------------+
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| WAN Interface | eth0 |
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+---------------------------------------+---------------------+
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| On-premises address space | 10.10.0.0/16 |
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+---------------------------------------+---------------------+
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| Azure address space | 10.0.0.0/16 |
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+---------------------------------------+---------------------+
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| Vyos public IP | 198.51.100.3 |
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+---------------------------------------+---------------------+
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| Vyos private IP | 10.10.0.5 |
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+---------------------------------------+---------------------+
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| Azure VNet Gateway 1 public IP | 203.0.113.2 |
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+---------------------------------------+---------------------+
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| Azure VNet Gateway 2 public IP | 203.0.113.3 |
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+---------------------------------------+---------------------+
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| Azure VNet Gateway BGP IP | 10.0.0.4,10.0.0.5 |
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+---------------------------------------+---------------------+
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| Pre-shared key | ch00s3-4-s3cur3-psk |
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+---------------------------------------+---------------------+
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| Vyos ASN | 64499 |
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+---------------------------------------+---------------------+
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| Azure ASN | 65540 |
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+---------------------------------------+---------------------+
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Vyos configuration
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^^^^^^^^^^^^^^^^^^
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- Configure the IKE and ESP settings to match a subset
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of those supported by Azure:
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.. code-block:: none
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set vpn ipsec esp-group AZURE compression 'disable'
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set vpn ipsec esp-group AZURE lifetime '3600'
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set vpn ipsec esp-group AZURE mode 'tunnel'
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set vpn ipsec esp-group AZURE pfs 'dh-group2'
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set vpn ipsec esp-group AZURE proposal 1 encryption 'aes256'
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set vpn ipsec esp-group AZURE proposal 1 hash 'sha1'
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set vpn ipsec ike-group AZURE dead-peer-detection action 'restart'
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set vpn ipsec ike-group AZURE dead-peer-detection interval '15'
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set vpn ipsec ike-group AZURE dead-peer-detection timeout '30'
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set vpn ipsec ike-group AZURE ikev2-reauth 'yes'
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set vpn ipsec ike-group AZURE key-exchange 'ikev2'
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set vpn ipsec ike-group AZURE lifetime '28800'
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set vpn ipsec ike-group AZURE proposal 1 dh-group '2'
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set vpn ipsec ike-group AZURE proposal 1 encryption 'aes256'
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set vpn ipsec ike-group AZURE proposal 1 hash 'sha1'
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- Enable IPsec on eth0
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.. code-block:: none
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set vpn ipsec interface 'eth0'
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- Configure two VTIs with a dummy IP address each
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.. code-block:: none
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set interfaces vti vti1 address '10.10.1.5/32'
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set interfaces vti vti1 description 'Azure Primary Tunnel'
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set interfaces vti vti2 address '10.10.1.6/32'
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set interfaces vti vti2 description 'Azure Secondary Tunnel'
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- Clamp the VTI's MSS to 1350 to avoid PMTU blackholes.
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.. code-block:: none
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set firewall options interface vti1 adjust-mss 1350
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set firewall options interface vti2 adjust-mss 1350
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- Configure the VPN tunnels
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.. code-block:: none
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set vpn ipsec authentication psk azure id '198.51.100.3'
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set vpn ipsec authentication psk azure id '203.0.113.2'
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set vpn ipsec authentication psk azure id '203.0.113.3'
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set vpn ipsec authentication psk azure secret 'ch00s3-4-s3cur3-psk'
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set vpn ipsec site-to-site peer azure-primary authentication local-id '198.51.100.3'
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set vpn ipsec site-to-site peer azure-primary authentication mode 'pre-shared-secret'
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set vpn ipsec site-to-site peer azure-primary authentication remote-id '203.0.113.2'
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set vpn ipsec site-to-site peer azure-primary connection-type 'respond'
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set vpn ipsec site-to-site peer azure-primary description 'AZURE PRIMARY TUNNEL'
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set vpn ipsec site-to-site peer azure-primary ike-group 'AZURE'
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set vpn ipsec site-to-site peer azure-primary ikev2-reauth 'inherit'
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set vpn ipsec site-to-site peer azure-primary local-address '10.10.0.5'
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set vpn ipsec site-to-site peer azure-primary remote-address '203.0.113.2'
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set vpn ipsec site-to-site peer azure-primary vti bind 'vti1'
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set vpn ipsec site-to-site peer azure-primary vti esp-group 'AZURE'
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set vpn ipsec site-to-site peer azure-secondary authentication local-id '198.51.100.3'
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set vpn ipsec site-to-site peer azure-secondary authentication mode 'pre-shared-secret'
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set vpn ipsec site-to-site peer azure-secondary authentication remote-id '203.0.113.3'
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set vpn ipsec site-to-site peer azure-secondary connection-type 'respond'
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set vpn ipsec site-to-site peer azure-secondary description 'AZURE secondary TUNNEL'
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set vpn ipsec site-to-site peer azure-secondary ike-group 'AZURE'
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set vpn ipsec site-to-site peer azure-secondary ikev2-reauth 'inherit'
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set vpn ipsec site-to-site peer azure-secondary local-address '10.10.0.5'
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set vpn ipsec site-to-site peer azure-secondary remote-address '203.0.113.3'
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set vpn ipsec site-to-site peer azure-secondary vti bind 'vti2'
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set vpn ipsec site-to-site peer azure-secondary vti esp-group 'AZURE'
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- **Important**: Add an interface route to reach both Azure's BGP listeners
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.. code-block:: none
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set protocols static route 10.0.0.4/32 interface vti1
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set protocols static route 10.0.0.5/32 interface vti2
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- Configure your BGP settings
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.. code-block:: none
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set protocols bgp system-as 64499
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set protocols bgp neighbor 10.0.0.4 remote-as '65540'
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set protocols bgp neighbor 10.0.0.4 address-family ipv4-unicast soft-reconfiguration 'inbound'
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set protocols bgp neighbor 10.0.0.4 timers holdtime '30'
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set protocols bgp neighbor 10.0.0.4 timers keepalive '10'
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set protocols bgp neighbor 10.0.0.5 remote-as '65540'
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set protocols bgp neighbor 10.0.0.5 address-family ipv4-unicast soft-reconfiguration 'inbound'
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set protocols bgp neighbor 10.0.0.5 timers holdtime '30'
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set protocols bgp neighbor 10.0.0.5 timers keepalive '10'
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- **Important**: Disable connected check, otherwise the routes learned
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from Azure will not be imported into the routing table.
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.. code-block:: none
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set protocols bgp neighbor 10.0.0.4 disable-connected-check
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set protocols bgp neighbor 10.0.0.5 disable-connected-check
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