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:lastproofread: 2021-06-28
.. _examples-azure-vpn-bgp:
Route-Based Site-to-Site VPN to Azure (BGP over IKEv2/IPsec)
------------------------------------------------------------
This guide shows an example of a route-based IKEv2 site-to-site VPN to
Azure using VTI and BGP for dynamic routing updates.
For redundant / active-active configurations see
:ref:`examples-azure-vpn-dual-bgp`
Prerequisites
^^^^^^^^^^^^^
- A pair of Azure VNet Gateways deployed in active-passive
configuration with BGP enabled.
- A local network gateway deployed in Azure representing
the Vyos device, matching the below Vyos settings except for
address space, which only requires the Vyos private IP, in
this example 10.10.0.5/32
- A connection resource deployed in Azure linking the
Azure VNet gateway and the local network gateway representing
the Vyos device.
Example
^^^^^^^
+---------------------------------------+---------------------+
| WAN Interface | eth0 |
+---------------------------------------+---------------------+
| On-premises address space | 10.10.0.0/16 |
+---------------------------------------+---------------------+
| Azure address space | 10.0.0.0/16 |
+---------------------------------------+---------------------+
| Vyos public IP | 198.51.100.3 |
+---------------------------------------+---------------------+
| Vyos private IP | 10.10.0.5 |
+---------------------------------------+---------------------+
| Azure VNet Gateway public IP | 203.0.113.2 |
+---------------------------------------+---------------------+
| Azure VNet Gateway BGP IP | 10.0.0.4 |
+---------------------------------------+---------------------+
| Pre-shared key | ch00s3-4-s3cur3-psk |
+---------------------------------------+---------------------+
| Vyos ASN | 64499 |
+---------------------------------------+---------------------+
| Azure ASN | 65540 |
+---------------------------------------+---------------------+
Vyos configuration
^^^^^^^^^^^^^^^^^^
- Configure the IKE and ESP settings to match a subset
of those supported by Azure:
.. code-block:: none
set vpn ipsec esp-group AZURE compression 'disable'
set vpn ipsec esp-group AZURE lifetime '3600'
set vpn ipsec esp-group AZURE mode 'tunnel'
set vpn ipsec esp-group AZURE pfs 'dh-group2'
set vpn ipsec esp-group AZURE proposal 1 encryption 'aes256'
set vpn ipsec esp-group AZURE proposal 1 hash 'sha1'
set vpn ipsec ike-group AZURE dead-peer-detection action 'restart'
set vpn ipsec ike-group AZURE dead-peer-detection interval '15'
set vpn ipsec ike-group AZURE dead-peer-detection timeout '30'
set vpn ipsec ike-group AZURE ikev2-reauth 'yes'
set vpn ipsec ike-group AZURE key-exchange 'ikev2'
set vpn ipsec ike-group AZURE lifetime '28800'
set vpn ipsec ike-group AZURE proposal 1 dh-group '2'
set vpn ipsec ike-group AZURE proposal 1 encryption 'aes256'
set vpn ipsec ike-group AZURE proposal 1 hash 'sha1'
- Enable IPsec on eth0
.. code-block:: none
set vpn ipsec interface 'eth0'
- Configure a VTI with a dummy IP address
.. code-block:: none
set interfaces vti vti1 address '10.10.1.5/32'
set interfaces vti vti1 description 'Azure Tunnel'
- Clamp the VTI's MSS to 1350 to avoid PMTU blackholes.
.. code-block:: none
set firewall options interface vti1 adjust-mss 1350
- Configure the VPN tunnel
.. code-block:: none
set vpn ipsec site-to-site peer 203.0.113.2 authentication id '198.51.100.3'
set vpn ipsec site-to-site peer 203.0.113.2 authentication mode 'pre-shared-secret'
set vpn ipsec site-to-site peer 203.0.113.2 authentication pre-shared-secret 'ch00s3-4-s3cur3-psk'
set vpn ipsec site-to-site peer 203.0.113.2 authentication remote-id '203.0.113.2'
set vpn ipsec site-to-site peer 203.0.113.2 connection-type 'respond'
set vpn ipsec site-to-site peer 203.0.113.2 description 'AZURE PRIMARY TUNNEL'
set vpn ipsec site-to-site peer 203.0.113.2 ike-group 'AZURE'
set vpn ipsec site-to-site peer 203.0.113.2 ikev2-reauth 'inherit'
set vpn ipsec site-to-site peer 203.0.113.2 local-address '10.10.0.5'
set vpn ipsec site-to-site peer 203.0.113.2 vti bind 'vti1'
set vpn ipsec site-to-site peer 203.0.113.2 vti esp-group 'AZURE'
- **Important**: Add an interface route to reach Azure's BGP listener
.. code-block:: none
set protocols static route 10.0.0.4/32 interface vti1
- Configure your BGP settings
.. code-block:: none
set protocols bgp system-as 64499
set protocols bgp neighbor 10.0.0.4 remote-as '65540'
set protocols bgp neighbor 10.0.0.4 address-family ipv4-unicast soft-reconfiguration 'inbound'
set protocols bgp neighbor 10.0.0.4 timers holdtime '30'
set protocols bgp neighbor 10.0.0.4 timers keepalive '10'
- **Important**: Disable connected check \
.. code-block:: none
set protocols bgp neighbor 10.0.0.4 disable-connected-check
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