ADVPN with OSPF as the routing protocol

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ADVPN with OSPF as the routing protocol

This recipe provides sample configuration of ADVPN with OSPF as the routing protocol. The following options must be enabled for this configuration: l On the hub FortiGate, IPsec phase1-interface net-device enable must be run. l OSPF must be used between the hub and spoke FortiGates.

The following shows the sample network topology for this recipe:

As only partial configuration can be completed from the GUI, it is recommended to achieve this configuration via the CLI commands as shown below.

To configure ADVPN with RIP as the routing protocol using the FortiOS CLI:

  1. In the FortiOS CLI, 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

  1. Configure the hub FortiGate:
  2. 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 tunnel-search nexthop 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

  1. 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

  1. 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

  1. 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

  1. Configure the spoke FortiGates:
  2. Configure the spoke FortiGates’ WAN, internal interfaces, and static routes:
  3. 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

  1. 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

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

  1. 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

  1. Configure the spoke FortiGates’ firewall policies:
  2. 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

  1. 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

  1. Configure the spoke FortiGates’ tunnel interface IP addresses:
  2. 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

  1. 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

  1. Configure the spoke FortiGates’ OSPF:
  2. 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

  1. 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

  1. Run diagnose and get commands to check VPN and OSPF states. All following commands should be run on Spoke1:
  2. 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

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

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

  1. 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

  1. 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

  1. 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

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

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

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 e. 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

This entry was posted in Administration Guides, FortiGate, FortiOS 6.2 on by .

About Mike

Michael Pruett, CISSP has a wide range of cyber-security and network engineering expertise. The plethora of vendors that resell hardware but have zero engineering knowledge resulting in the wrong hardware or configuration being deployed is a major pet peeve of Michael's. This site was started in an effort to spread information while providing the option of quality consulting services at a much lower price than Fortinet Professional Services. Owns PacketLlama.Com (Fortinet Hardware Sales) and Office Of The CISO, LLC (Cybersecurity consulting firm).

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