到Azure的基于路由的冗余站点到站点VPN（IKEv2/IPsec上的BGP）

本指南展示了一个基于IKEv2站点到站点VPN到Azure的冗余（主动）路由的示例，使用VTI和BGP进行动态路由更新。

先决条件

  • 一对Azure VNet网关，部署在启用BGP的活动配置中。

  • 部署在Azure中的本地网络网关，表示Vyos设备，与下面的Vyos设置匹配，除了地址空间，它只需要Vyos专用IP，在本例中为10.10.0.5/32

  • 部署在Azure中的连接资源，用于链接Azure VNet网关和表示Vyos设备的本地网络网关。

例

WAN 接口

eth0

本地地址空间

10.10.0.0/16

Azure地址空间

10.0.0.0/16

Vyos公共IP

198.51.100.3

Vyos私有IP

10.10.0.5

Azure VNet网关1公用IP

203.0.113.2

Azure VNet网关2公共IP

203.0.113.3

Azure VNet网关BGP IP

10.0.0.4,10.0.0.5

预共享密钥

ch00s3-4-s3cur3-psk

Vyos ASN

64499

Azure ASN

65540

Vyos配置

  • 配置IKE和ESP设置，以匹配Azure支持的子集：

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'

  • 在eth0上启用IPsec

set vpn ipsec ipsec-interfaces interface 'eth0'

  • 配置两个VTI，每个VTI都有一个虚拟IP地址

set interfaces vti vti1 address '10.10.1.5/32'
set interfaces vti vti1 description 'Azure Primary Tunnel'

set interfaces vti vti2 address '10.10.1.6/32'
set interfaces vti vti2 description 'Azure Secondary Tunnel'

  • 夹紧VTI的MSS至1350以避免PMTU黑洞。

set firewall options interface vti1 adjust-mss 1350
set firewall options interface vti2 adjust-mss 1350

  • 配置VPN隧道

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'

set vpn ipsec site-to-site peer 203.0.113.3 authentication id '198.51.100.3'
set vpn ipsec site-to-site peer 203.0.113.3 authentication mode 'pre-shared-secret'
set vpn ipsec site-to-site peer 203.0.113.3 authentication pre-shared-secret 'ch00s3-4-s3cur3-psk'
set vpn ipsec site-to-site peer 203.0.113.3 authentication remote-id '203.0.113.3'
set vpn ipsec site-to-site peer 203.0.113.3 connection-type 'respond'
set vpn ipsec site-to-site peer 203.0.113.3 description 'AZURE SECONDARY TUNNEL'
set vpn ipsec site-to-site peer 203.0.113.3 ike-group 'AZURE'
set vpn ipsec site-to-site peer 203.0.113.3 ikev2-reauth 'inherit'
set vpn ipsec site-to-site peer 203.0.113.3 local-address '10.10.0.5'
set vpn ipsec site-to-site peer 203.0.113.3 vti bind 'vti2'
set vpn ipsec site-to-site peer 203.0.113.3 vti esp-group 'AZURE'

  • 重要提示：添加接口路由，以访问Azure的BGP侦听器

set protocols static route 10.0.0.4/32 interface vti1
set protocols static route 10.0.0.5/32 interface vti2

  • 配置BGP设置

set protocols bgp 64499 neighbor 10.0.0.4 remote-as '65540'
set protocols bgp 64499 neighbor 10.0.0.4 address-family ipv4-unicast soft-reconfiguration 'inbound'
set protocols bgp 64499 neighbor 10.0.0.4 timers holdtime '30'
set protocols bgp 64499 neighbor 10.0.0.4 timers keepalive '10'

set protocols bgp 64499 neighbor 10.0.0.5 remote-as '65540'
set protocols bgp 64499 neighbor 10.0.0.5 address-family ipv4-unicast soft-reconfiguration 'inbound'
set protocols bgp 64499 neighbor 10.0.0.5 timers holdtime '30'
set protocols bgp 64499 neighbor 10.0.0.5 timers keepalive '10'

  • 重要提示：禁用连接检查，否则从Azure学习的路由将不会导入路由表。

set protocols bgp 64499 neighbor 10.0.0.4 disable-connected-check
set protocols bgp 64499 neighbor 10.0.0.5 disable-connected-check