ADVPN with OSPF as the routing protocol

This is a sample configuration of ADVPN with OSPF as the routing protocol. The following options must be enabled for this configuration:

• On the hub FortiGate, IPsec phase1-interface net-device enable must be run.

• OSPF must be used between the hub and spoke FortiGates.

To configure ADVPN with OSPF as the routing protocol using the CLI:

1. Configure hub FortiGate's WAN, internal interface, and static route:

   config system interface
       edit "port9"
           set alias "WAN"
           set ip 22.1.1.1 255.255.255.0
       next
       edit "port10"
           set alias "Internal"
           set ip 172.16.101.1 255.255.255.0
       next
   end   
   config router static
       edit 1
           set gateway 22.1.1.2
           set device "port9"
       next  
   end  		

2. Configure the hub FortiGate:

   1. Configure the hub FortiGate IPsec phase1-interface and phase2-interface:

      config vpn ipsec phase1-interface
          edit "advpn-hub"
              set type dynamic
              set interface "port9"
              set peertype any
              set net-device enable
              set proposal aes128-sha256 aes256-sha256 3des-sha256 aes128-sha1 aes256-sha1 3des-sha1
              set add-route disable
              set dpd on-idle
              set auto-discovery-sender enable
              set psksecret sample
              set dpd-retryinterval 5
          next
      end
      config vpn ipsec phase2-interface
          edit "advpn-hub"
              set phase1name "advpn-hub"
              set proposal aes128-sha1 aes256-sha1 3des-sha1 aes128-sha256 aes256-sha256 3des-sha256
          next
      end

      When net-device is disabled, a tunnel ID is generated for each dynamic tunnel. This ID, in the form of an IP address, is used as the gateway in the route entry to that tunnel. The tunnel-search option is removed in FortiOS 7.0.0 and later.

   2. Configure the hub FortiGate firewall policy:

      config firewall policy
          edit 1
              set name "spoke2hub"
              set srcintf "advpn-hub"
              set dstintf "port10"
              set srcaddr "all"
              set dstaddr "172.16.101.0"
              set action accept
              set schedule "always"
              set service "ALL"
          next
          edit 2
              set name "spoke2spoke"
              set srcintf "advpn-hub"
              set dstintf "advpn-hub"
              set srcaddr "all"
              set dstaddr "all"
              set action accept
              set schedule "always"
              set service "ALL"
          next
      end   

   3. Configure the hub FortiGate's IPsec tunnel interface IP address:

      config system interface
          edit "advpn-hub1"
              set ip 10.10.10.254 255.255.255.255
              set remote-ip 10.10.10.253 255.255.255.0
          next
      end

   4. Configure the hub FortiGate's OSPF:

      config router ospf
          set router-id 1.1.1.1
          config area
              edit 0.0.0.0
              next
          end
          config network
              edit 1
                  set prefix 10.10.10.0 255.255.255.0
              next
              edit 2
                  set prefix 172.16.101.0 255.255.255.0
              next
          end
      end

3. Configure the spoke FortiGates:

   1. Configure the spoke FortiGates' WAN, internal interfaces, and static routes:

      1. Configure Spoke1:

         config system interface
             edit "wan1"
                 set alias "primary_WAN"
                 set ip 15.1.1.2 255.255.255.0
             next
             edit "wan2"
                 set alias "secondary_WAN"
                 set ip 12.1.1.2 255.255.255.0
             next
             edit "internal"
                 set ip 10.1.100.1 255.255.255.0
             next
         end 
         config router static
             edit 1
                 set gateway 12.1.1.1
                 set device "wan2"
                 set distance 15        
             next
             edit 2
                 set gateway 15.1.1.1
                 set device "wan1"
             next
         end   

      2. Configure the Spoke2:

         config system interface
             edit "wan1"
                 set alias "primary_WAN"
                 set ip 13.1.1.2 255.255.255.0
             next
             edit "wan2"
                 set alias "secondary_WAN"
                 set ip 17.1.1.2 255.255.255.0
             next
             edit "internal"
                 set ip 192.168.4.1 255.255.255.0
             next
         end 
         config router static
             edit 1
                 set gateway 17.1.1.1
                 set device "wan2"
                 set distance 15        
             next
             edit 2
                 set gateway 13.1.1.1
                 set device "wan1"
             next
         end     

   2. Configure the spoke FortiGates' IPsec phase1-interface and phase2-interface:

      1. Configure Spoke1:

         config vpn ipsec phase1-interface
             edit "spoke1"
                 set interface "wan1"
                 set peertype any
                 set net-device enable
                 set proposal aes128-sha256 aes256-sha256 aes128-sha1 aes256-sha1
                 set add-route disable
                 set dpd on-idle
                 set auto-discovery-receiver enable
                 set remote-gw 22.1.1.1
                 set psksecret sample 
                 set dpd-retryinterval 5
             next
             edit "spoke1_backup"
                 set interface "wan2"
                 set peertype any
                 set net-device enable
                 set proposal aes128-sha256 aes256-sha256 aes128-sha1 aes256-sha1
                 set add-route disable
                 set dpd on-idle
                 set auto-discovery-receiver enable
                 set remote-gw 22.1.1.1
                 set monitor "spoke1"
                 set psksecret sample
                 set dpd-retryinterval 5
             next    
         end
         config vpn ipsec phase2-interface
             edit "spoke1"
                 set phase1name "spoke1"
                 set proposal aes128-sha1 aes256-sha1 aes128-sha256 aes256-sha256 aes128gcm aes256gcm chacha20poly1305
                 set auto-negotiate enable
             next
             edit "spoke1_backup"
                 set phase1name "spoke1_backup"
                 set proposal aes128-sha1 aes256-sha1 aes128-sha256 aes256-sha256 aes128gcm aes256gcm chacha20poly1305
                 set auto-negotiate enable
             next  
         end

      2. Configure Spoke2:

         config vpn ipsec phase1-interface
             edit "spoke2"
                 set interface "wan1"
                 set peertype any
                 set net-device enable
                 set proposal aes128-sha256 aes256-sha256 aes128-sha1 aes256-sha1
                 set add-route disable
                 set dpd on-idle
                 set auto-discovery-receiver enable
                 set remote-gw 22.1.1.1
                 set psksecret sample 
                 set dpd-retryinterval 5
             next
             edit "spoke2_backup"
                 set interface "wan2"
                 set peertype any
                 set net-device enable
                 set proposal aes128-sha256 aes256-sha256 aes128-sha1 aes256-sha1
                 set add-route disable
                 set dpd on-idle
                 set auto-discovery-receiver enable
                 set remote-gw 22.1.1.1
                 set monitor "spoke2"
                 set psksecret sample
                 set dpd-retryinterval 5
             next    
         end
         config vpn ipsec phase2-interface
             edit "spoke2"
                 set phase1name "spoke2"
                 set proposal aes128-sha1 aes256-sha1 aes128-sha256 aes256-sha256 aes128gcm aes256gcm chacha20poly1305
                 set auto-negotiate enable
             next
             edit "spoke2_backup"
                 set phase1name "spoke2_backup"
                 set proposal aes128-sha1 aes256-sha1 aes128-sha256 aes256-sha256 aes128gcm aes256gcm chacha20poly1305
                 set auto-negotiate enable
             next  
         end

   3. Configure the spoke FortiGates' firewall policies:

      1. Configure Spoke1:

         config firewall policy
             edit 1
                 set name "outbound_advpn"
                 set srcintf "internal"
                 set dstintf "spoke1" "spoke1_backup"
                 set srcaddr "all"
                 set dstaddr "all"
                 set action accept
                 set schedule "always"
                 set service "ALL"
             next
             edit 2
                 set name "inbound_advpn"
                 set srcintf "spoke1" "spoke1_backup"
                 set dstintf "internal"
                 set srcaddr "all"
                 set dstaddr "all"
                 set action accept
                 set schedule "always"
                 set service "ALL"
             next
         end

      2. Configure Spoke2:

         config firewall policy
             edit 1
                 set name "outbound_advpn"
                 set srcintf "internal"
                 set dstintf "spoke2" "spoke2_backup"
                 set srcaddr "all"
                 set dstaddr "all"
                 set action accept
                 set schedule "always"
                 set service "ALL"
             next
             edit 2
                 set name "inbound_advpn"
                 set srcintf "spoke2" "spoke2_backup"
                 set dstintf "internal"
                 set srcaddr "all"
                 set dstaddr "all"
                 set action accept
                 set schedule "always"
                 set service "ALL"
             next
         end

   4. Configure the spoke FortiGates' tunnel interface IP addresses:

      1. Configure Spoke1:

         config system interface
             edit "spoke1"
                 set ip 10.10.10.1 255.255.255.255
                 set remote-ip 10.10.10.254 255.255.255.0
             next
             edit "spoke1_backup"
                 set ip 10.10.10.2 255.255.255.255
                 set remote-ip 10.10.10.254 255.255.255.0
             next    
         end

      2. Configure Spoke2:

         config system interface
             edit "spoke2"
                 set ip 10.10.10.3 255.255.255.255
                 set remote-ip 10.10.10.254 255.255.255.0
             next
             edit "spoke2_backup"
                 set ip 10.10.10.4 255.255.255.255
                 set remote-ip 10.10.10.254 255.255.255.0
             next    
         end

   5. Configure the spoke FortiGates' OSPF:

      1. Configure Spoke1:

         config router ospf
             set router-id 7.7.7.7
             config area
                 edit 0.0.0.0
                 next
             end
             config network
                 edit 1
                     set prefix 10.10.10.0 255.255.255.0
                 next
                 edit 2
                     set prefix 10.1.100.0 255.255.255.0
                 next
             end
         end

      2. Configure Spoke2:

         config router ospf
             set router-id 8.8.8.8
             config area
                 edit 0.0.0.0
                 next
             end
             config network
                 edit 1
                     set prefix 10.10.10.0 255.255.255.0
                 next
                 edit 2
                     set prefix 192.168.4.0 255.255.255.0
                 next
             end
         end

4. Run diagnose and get commands on Spoke1 to check VPN and OSPF states:

   1. Run the diagnose vpn tunnel list command on Spoke1. The system should return the following:

      list all ipsec tunnel in vd 0
      ----
      name=spoke1 ver=1 serial=2 15.1.1.2:0->22.1.1.1:0 tun_id=22.1.1.1
      bound_if=7 lgwy=static/1 tun=intf/0 mode=auto/1 encap=none/536 options[0218]=npu create_dev frag-rfc  accept_traffic=1
      
      proxyid_num=1 child_num=1 refcnt=19 ilast=5 olast=2 ad=r/2
      stat: rxp=1 txp=263 rxb=16452 txb=32854
      dpd: mode=on-idle on=1 idle=5000ms retry=3 count=0 seqno=2283
      natt: mode=none draft=0 interval=0 remote_port=0
      proxyid=spoke1 proto=0 sa=1 ref=5 serial=1 auto-negotiate adr
        src: 0:0.0.0.0/0.0.0.0:0
        dst: 0:0.0.0.0/0.0.0.0:0
        SA:  ref=6 options=1a227 type=00 soft=0 mtu=1438 expire=1057/0B replaywin=1024
             seqno=108 esn=0 replaywin_lastseq=00000003 itn=0
        life: type=01 bytes=0/0 timeout=2371/2400
        dec: spi=c53a8f78 esp=aes key=16 7cc50c5c9df1751f6497a4ad764c5e9a
             ah=sha1 key=20 269292ddbf7309a6fc05871e63ed8a5297b5c9a1
        enc: spi=6e363612 esp=aes key=16 42bd49bced1e85cf74a24d97f10eb601
             ah=sha1 key=20 13964f166aad48790c2e551d6df165d7489f524b
        dec:pkts/bytes=1/16394, enc:pkts/bytes=263/50096
        npu_flag=03 npu_rgwy=22.1.1.1 npu_lgwy=15.1.1.2 npu_selid=1 dec_npuid=1 enc_npuid=1
      ----
      name=spoke1_backup ver=1 serial=1 12.1.1.2:0->22.1.1.1:0 tun_id=22.1.1.1
      bound_if=6 lgwy=static/1 tun=intf/0 mode=auto/1 encap=none/536 options[0218]=npu create_dev frag-rfc  accept_traffic=0
      
      proxyid_num=1 child_num=0 refcnt=11 ilast=8 olast=8 ad=/0
      stat: rxp=0 txp=0 rxb=0 txb=0
      dpd: mode=on-idle on=0 idle=5000ms retry=3 count=0 seqno=0
      natt: mode=none draft=0 interval=0 remote_port=0
      proxyid=spoke1_backup proto=0 sa=0 ref=2 serial=1 auto-negotiate adr
        src: 0:0.0.0.0/0.0.0.0:0
        dst: 0:0.0.0.0/0.0.0.0:0

   2. Run the get router info ospf neighbor command on Spoke1. The system should return the following:

      OSPF process 0, VRF 0: Neighbor ID Pri State Dead Time Address Interface 8.8.8.8 1. Full/ - 00:00:35 10.10.10.254 spoke1 1.1.1.1 1. Full/ - 00:00:35 10.10.10.254 spoke1

   3. Run the get router info routing-table ospf command on Spoke1. The system should return the following:

      Routing table for VRF=0
      O       172.16.101.0/24 [110/110] via 10.10.10.254, spoke1, 00:23:23
      O       192.168.4.0/24   [110/110] via 10.10.10.254, spoke1, 00:22:35

   4. Generate traffic between the spokes, then check the shortcut tunnel and routing table. Run the diagnose vpn tunnel list command on Spoke1. The system should return the following:

      list all ipsec tunnel in vd 0
      ----
      ----
      name=spoke1 ver=1 serial=2 15.1.1.2:0->22.1.1.1:0 tun_id=22.1.1.1
      bound_if=7 lgwy=static/1 tun=intf/0 mode=auto/1 encap=none/536 options[0218]=npu create_dev frag-rfc  accept_traffic=1
      
      proxyid_num=1 child_num=1 refcnt=19 ilast=2 olast=2 ad=r/2
      stat: rxp=1 txp=313 rxb=16452 txb=35912
      dpd: mode=on-idle on=1 idle=5000ms retry=3 count=0 seqno=2303
      natt: mode=none draft=0 interval=0 remote_port=0
      proxyid=spoke1 proto=0 sa=1 ref=3 serial=1 auto-negotiate adr
        src: 0:0.0.0.0/0.0.0.0:0
        dst: 0:0.0.0.0/0.0.0.0:0
        SA:  ref=6 options=1a227 type=00 soft=0 mtu=1438 expire=782/0B replaywin=1024
             seqno=13a esn=0 replaywin_lastseq=00000003 itn=0
        life: type=01 bytes=0/0 timeout=2371/2400
        dec: spi=c53a8f78 esp=aes key=16 7cc50c5c9df1751f6497a4ad764c5e9a
             ah=sha1 key=20 269292ddbf7309a6fc05871e63ed8a5297b5c9a1
        enc: spi=6e363612 esp=aes key=16 42bd49bced1e85cf74a24d97f10eb601
             ah=sha1 key=20 13964f166aad48790c2e551d6df165d7489f524b
        dec:pkts/bytes=1/16394, enc:pkts/bytes=313/56432
        npu_flag=03 npu_rgwy=22.1.1.1 npu_lgwy=15.1.1.2 npu_selid=1 dec_npuid=1 enc_npuid=1
      ----
      name=spoke1_backup ver=1 serial=1 12.1.1.2:0->22.1.1.1:0 tun_id=22.1.1.1
      bound_if=6 lgwy=static/1 tun=intf/0 mode=auto/1 encap=none/536 options[0218]=npu create_dev frag-rfc  accept_traffic=0
      
      proxyid_num=1 child_num=0 refcnt=11 ilast=13 olast=13 ad=/0
      stat: rxp=0 txp=0 rxb=0 txb=0
      dpd: mode=on-idle on=0 idle=5000ms retry=3 count=0 seqno=0
      natt: mode=none draft=0 interval=0 remote_port=0
      proxyid=spoke1_backup proto=0 sa=0 ref=2 serial=1 auto-negotiate adr
        src: 0:0.0.0.0/0.0.0.0:0
        dst: 0:0.0.0.0/0.0.0.0:0
      ----
      name=spoke1_0 ver=1 serial=e 15.1.1.2:4500->13.1.1.2:4500 tun_id=13.1.1.2
      bound_if=7 lgwy=static/1 tun=intf/0 mode=dial_inst/3 encap=none/728 options[02d8]=npu create_dev no-sysctl rgwy-chg frag-rfc  accept_traffic=1
      
       parent=spoke1 index=0
      proxyid_num=1 child_num=0 refcnt=19 ilast=4 olast=2 ad=r/2
      stat: rxp=641 txp=1254 rxb=278648 txb=161536
      dpd: mode=on-idle on=1 idle=5000ms retry=3 count=0 seqno=184
      natt: mode=keepalive draft=32 interval=10 remote_port=4500
      proxyid=spoke1_backup proto=0 sa=1 ref=10 serial=1 auto-negotiate adr
        src: 0:0.0.0.0/0.0.0.0:0
        dst: 0:0.0.0.0/0.0.0.0:0
        SA:  ref=6 options=1a227 type=00 soft=0 mtu=1422 expire=922/0B replaywin=1024
             seqno=452 esn=0 replaywin_lastseq=00000280 itn=0
        life: type=01 bytes=0/0 timeout=2370/2400
        dec: spi=c53a8f79 esp=aes key=16 324f8cf840ba6722cc7abbba46b34e0e
             ah=sha1 key=20 a40e9aac596b95c4cd83a7f6372916a5ef5aa505
        enc: spi=ef3327b5 esp=aes key=16 5909d6066b303de4520d2b5ae2db1b61
             ah=sha1 key=20 1a42f5625b5a335d8d5282fe83b5d6c6ff26b2a4
        dec:pkts/bytes=641/278568, enc:pkts/bytes=1254/178586
        npu_flag=03 npu_rgwy=13.1.1.2 npu_lgwy=15.1.1.2 npu_selid=a dec_npuid=1 enc_npuid=1

   5. Run the get router info routing-tale ospf command. The system should return the following:

      Routing table for VRF=0
      O       172.16.101.0/24 [110/110] via 10.10.10.254, spoke1, 00:27:14
      O       192.168.4.0/24  [110/110] via  10.10.10.3, spoke1_0, 00:26:26