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Technical Tip: ADVPN with OSPF as the routing protocol

Forum|Forum|5 years ago
November 10, 2020
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Description

This article describes the configuration ADVPN with OSPF.

Scope

For version 6.4.3, and version 7.0.1+.

Solution

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

1) On the hub FortiGate, 'IPsec phase1-interface net-device enable ' must be run.
2) OSPF has to be used between the hub and spoke(s) FortiGates.

Because the GUI can only complete part of the configuration, using the CLI is recommended.
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.

- 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 <-- tunnel search option in phase1 removed from FortiOS 7.0.1 and above because the IPsec kernel now uses dedicated tunnel IDs as identifiers for each tunnel.
        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

- 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 "all"
        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

- 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 <-- IP address in the subnet range.
    next
end

- 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 FortiGate.

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

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

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

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

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

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

- Configure the spoke FortiGates' firewall policies.

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

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

- Configure the spoke FortiGates' tunnel interface IP addresses.

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

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

- Configure the spoke FortiGates' OSPF.

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

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.

- 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

- 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

- 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

- 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

- 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

- After successful ping test between spokes and ADVPN dynamic tunnel shortcut between spokes failed to form, then verify that NAT was not accidentally set in the ADVPN Hub's Firewall Policy.

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