Hi, I have setup libreswan IPSec VPN tunnel using route based VPN through VTI interface. Please find the below configurations. *IPSec VPN Tunnel Server 1 ( IP :- 172.31.1.54)*
[root@ip-172-31-1-54 log]# cat /etc/ipsec.d/vtiipsecrouted.conf conn routed-vpn left=172.31.1.54 right=172.31.15.8 authby=secret #leftsubnet=0.0.0.0/0 #rightsubnet=0.0.0.0/0 auto=add # route-based VPN requires marking and an interface mark=5/0xffffffff vti-interface=vti01 # do not setup routing because we don't want to send 0.0.0.0/0 over the tunnel vti-routing=no # If you run a subnet with BGP (bird) daemon over IPsec, you can configure the VTI interface leftvti=10.0.1.1/24 [root@ip-172-31-1-54 log]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP qlen 1000 link/ether 02:2f:90:d6:66:6a brd ff:ff:ff:ff:ff:ff inet 172.31.1.54/20 brd 172.31.15.255 scope global dynamic eth0 valid_lft 2763sec preferred_lft 2763sec 3: ip_vti0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN qlen 1 link/ipip 0.0.0.0 brd 0.0.0.0 10: vti01@NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 8981 qdisc noqueue state UNKNOWN qlen 1
*link/ipip 172.31.1.54 peer 172.31.15.8* *inet 10.0.1.1/24 <http://10.0.1.1/24>* scope global vti01 valid_lft forever preferred_lft forever [root@ip-172-31-1-54 log]#ps aux | grep ipsec root 7903 0.0 0.0 204880 7692 ? Ssl 07:10 0:00 /usr/libexec/ipsec/pluto --leak-detective --config /etc/ipsec.conf --nofork
[root@ip-172-31-1-54 log]# ip xfrm policy src 172.31.1.54/32 dst 172.31.15.8/32 dir out priority 2080 ptype main mark 5/0xffffffff tmpl src 172.31.1.54 dst 172.31.15.8 proto esp reqid 16393 mode tunnel src 172.31.15.8/32 dst 172.31.1.54/32 dir fwd priority 2080 ptype main mark 5/0xffffffff tmpl src 172.31.15.8 dst 172.31.1.54 proto esp reqid 16393 mode tunnel src 172.31.15.8/32 dst 172.31.1.54/32 dir in priority 2080 ptype main mark 5/0xffffffff tmpl src 172.31.15.8 dst 172.31.1.54 proto esp reqid 16393 mode tunnel [root@ip-172-31-1-54 log]# [root@ip-172-31-1-54 log]# ip route list default via 172.31.0.1 dev eth0 10.0.1.0/24 dev vti01 proto kernel scope link src 10.0.1.1 172.31.0.0/20 dev eth0 proto kernel scope link src 172.31.1.54 [root@ip-172-31-1-54 log]# [root@ip-172-31-1-54 log]# service bird status Redirecting to /bin/systemctl status bird.service ● bird.service - BIRD Internet Routing Daemon Loaded: loaded (/usr/lib/systemd/system/bird.service; enabled; vendor preset: disabled) Active: active (running) since Thu 2018-04-12 07:11:00 UTC; 40min ago Process: 7963 ExecStart=/usr/sbin/bird (code=exited, status=0/SUCCESS) Main PID: 7964 (bird) CGroup: /system.slice/bird.service └─7964 /usr/sbin/bird Apr 12 07:11:00 ip-172-31-1-54.ap-southeast-1.compute.internal systemd[1]: Starting BIRD Internet Routing Daemon... Apr 12 07:11:00 ip-172-31-1-54.ap-southeast-1.compute.internal bird[7964]: Started Apr 12 07:11:00 ip-172-31-1-54.ap-southeast-1.compute.internal systemd[1]: Started BIRD Internet Routing Daemon. Apr 12 07:34:16 ip-172-31-1-54.ap-southeast-1.compute.internal bird[7964]: KIF: Received address message for unknown interface 10 [root@ip-172-31-1-54 log]# [root@ip-172-31-1-54 log]# birdc BIRD 1.6.4 ready. bird> show status BIRD 1.6.4 Router ID is 10.0.1.1 Current server time is 2018-04-12 07:28:42 Last reboot on 2018-04-12 07:10:59 Last reconfiguration on 2018-04-12 07:10:59 Daemon is up and running bird> show interfaces lo up (index=1) MultiAccess AdminUp LinkUp Loopback Ignored MTU=65536 127.0.0.1/8 (Primary, scope host) eth0 up (index=2) MultiAccess Broadcast Multicast AdminUp LinkUp MTU=9001 172.31.1.54/20 (Primary, scope site) ip_vti0 DOWN (index=3) MultiAccess AdminDown LinkDown MTU=1480 vti01 up (index=10) PtP Multicast AdminUp LinkUp MTU=8981 10.0.1.1/24 (Primary, scope site) bird> show protocols name proto table state since info kernel1 Kernel master up 07:11:00 device1 Device master up 07:11:00 testbgp BGP master start 07:11:00 Idle bird> show protocols all name proto table state since info kernel1 Kernel master up 07:10:59 Preference: 10 Input filter: ACCEPT Output filter: ACCEPT Routes: 1 imported, 0 exported, 1 preferred Route change stats: received rejected filtered ignored accepted Import updates: 1 0 0 0 1 Import withdraws: 0 0 --- 0 0 Export updates: 1 1 0 --- 0 Export withdraws: 0 --- --- --- 0 device1 Device master up 07:10:59 Preference: 240 Input filter: ACCEPT Output filter: REJECT Routes: 0 imported, 0 exported, 0 preferred Route change stats: received rejected filtered ignored accepted Import updates: 0 0 0 0 0 Import withdraws: 0 0 --- 0 0 Export updates: 0 0 0 --- 0 Export withdraws: 0 --- --- --- 0 testbgp BGP master start 07:10:59 Idle Preference: 160 Input filter: ACCEPT Output filter: (unnamed) Routes: 0 imported, 0 exported, 0 preferred Route change stats: received rejected filtered ignored accepted Import updates: 0 0 0 0 0 Import withdraws: 0 0 --- 0 0 Export updates: 0 0 0 --- 0 Export withdraws: 0 --- --- --- 0 BGP state: Idle Neighbor address: 10.1.2.2 Neighbor AS: 65003 bird>
*IPSec VPN Tunnel Server 2 ( IP :- 172.31.15.8)* [root@ip-172-31-15-8 ~]# cat /etc/ipsec.d/vtiipsecrouted.conf conn routed-vpn left=172.31.15.8 right=172.31.1.54 authby=secret #leftsubnet=0.0.0.0/0 #rightsubnet=0.0.0.0/0 auto=add # route-based VPN requires marking and an interface mark=5/0xffffffff vti-interface=vti01 # do not setup routing because we don't want to send 0.0.0.0/0 over the tunnel vti-routing=no # If you run a subnet with BGP (quagga) daemons over IPsec, you can configure the VTI interface leftvti=10.0.1.1/24 [root@ip-172-31-15-8 ~]# [root@ip-172-31-15-8 ~]# ps aux | grep ipsec root 6483 0.0 0.0 204880 7684 ? Ssl 07:36 0:00 /usr/libexec/ipsec/pluto --leak-detective --config /etc/ipsec.conf --nofork [root@ip-172-31-15-8 ~]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP qlen 1000 link/ether 02:87:cf:47:b5:5e brd ff:ff:ff:ff:ff:ff inet 172.31.15.8/20 brd 172.31.15.255 scope global dynamic eth0 valid_lft 3063sec preferred_lft 3063sec 3: ip_vti0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN qlen 1 link/ipip 0.0.0.0 brd 0.0.0.0 7: vti01@NONE: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 8981 qdisc noqueue state UNKNOWN qlen 1
*link/ipip 172.31.15.8 peer 172.31.1.54* *inet 10.0.1.1/24 <http://10.0.1.1/24>* scope global vti01 valid_lft forever preferred_lft forever [root@ip-172-31-15-8 ~]# [root@ip-172-31-15-8 ~]# ip xfrm policy src 172.31.15.8/32 dst 172.31.1.54/32 dir out priority 2080 ptype main mark 5/0xffffffff tmpl src 172.31.15.8 dst 172.31.1.54 proto esp reqid 16393 mode tunnel src 172.31.1.54/32 dst 172.31.15.8/32 dir fwd priority 2080 ptype main mark 5/0xffffffff tmpl src 172.31.1.54 dst 172.31.15.8 proto esp reqid 16393 mode tunnel src 172.31.1.54/32 dst 172.31.15.8/32 dir in priority 2080 ptype main mark 5/0xffffffff tmpl src 172.31.1.54 dst 172.31.15.8 proto esp reqid 16393 mode tunnel [root@ip-172-31-15-8 ~]# [root@ip-172-31-15-8 ~]# ip route list default via 172.31.0.1 dev eth0 10.0.1.0/24 dev vti01 proto kernel scope link src 10.0.1.1 172.31.0.0/20 dev eth0 proto kernel scope link src 172.31.15.8 [root@ip-172-31-15-8 ~]#
[root@ip-172-31-15-8 ~]# service bird status Redirecting to /bin/systemctl status bird.service ● bird.service - BIRD Internet Routing Daemon Loaded: loaded (/usr/lib/systemd/system/bird.service; enabled; vendor preset: disabled) Active: active (running) since Thu 2018-04-12 07:48:44 UTC; 18s ago Process: 6659 ExecStart=/usr/sbin/bird (code=exited, status=0/SUCCESS) Main PID: 6660 (bird) CGroup: /system.slice/bird.service └─6660 /usr/sbin/bird Apr 12 07:48:44 ip-172-31-15-8.ap-southeast-1.compute.internal systemd[1]: Starting BIRD Internet Routing Daemon... Apr 12 07:48:44 ip-172-31-15-8.ap-southeast-1.compute.internal systemd[1]: Started BIRD Internet Routing Daemon. Apr 12 07:48:44 ip-172-31-15-8.ap-southeast-1.compute.internal bird[6660]: Started [root@ip-172-31-15-8 ~]# birdc BIRD 1.6.4 ready. bird> show status BIRD 1.6.4 Router ID is 10.0.1.2 Current server time is 2018-04-12 07:49:13 Last reboot on 2018-04-12 07:48:43 Last reconfiguration on 2018-04-12 07:48:43 Daemon is up and running bird> show interfaces lo up (index=1) MultiAccess AdminUp LinkUp Loopback Ignored MTU=65536 127.0.0.1/8 (Primary, scope host) eth0 up (index=2) MultiAccess Broadcast Multicast AdminUp LinkUp MTU=9001 172.31.15.8/20 (Primary, scope site) ip_vti0 DOWN (index=3) MultiAccess AdminDown LinkDown MTU=1480 vti01 up (index=7) PtP Multicast AdminUp LinkUp MTU=8981 10.0.1.1/24 (Primary, scope site) bird> show protocols name proto table state since info kernel1 Kernel master up 07:48:43 device1 Device master up 07:48:43 testbgp BGP master start 07:48:43 Idle bird> show protocols all name proto table state since info kernel1 Kernel master up 07:48:44 Preference: 10 Input filter: ACCEPT Output filter: ACCEPT Routes: 1 imported, 0 exported, 1 preferred Route change stats: received rejected filtered ignored accepted Import updates: 1 0 0 0 1 Import withdraws: 0 0 --- 0 0 Export updates: 1 1 0 --- 0 Export withdraws: 0 --- --- --- 0 device1 Device master up 07:48:44 Preference: 240 Input filter: ACCEPT Output filter: REJECT Routes: 0 imported, 0 exported, 0 preferred Route change stats: received rejected filtered ignored accepted Import updates: 0 0 0 0 0 Import withdraws: 0 0 --- 0 0 Export updates: 0 0 0 --- 0 Export withdraws: 0 --- --- --- 0 testbgp BGP master start 07:48:44 Idle Preference: 160 Input filter: ACCEPT Output filter: (unnamed) Routes: 0 imported, 0 exported, 0 preferred Route change stats: received rejected filtered ignored accepted Import updates: 0 0 0 0 0 Import withdraws: 0 0 --- 0 0 Export updates: 0 0 0 --- 0 Export withdraws: 0 --- --- --- 0 BGP state: Idle Neighbor address: 10.1.2.2 Neighbor AS: 65003 bird> [root@ip-172-31-15-8 ~]#
Please let me know if the above configurations are correct and is the right approach to setup redundant route based VPN using VTI. I have couple of followup questions like how do i test failover between the two IPSec VPN servers using VTI and how do i test BIRD Daemon using BGP as i have configured BIRD on both the servers for the network architecture shown in https://i.imgur.com/dLFovre.png Thanks in Advance and your help will be really appreciated. I look forward to hearing from you. Best Regards, Kaushal