ADVPN with BGP as the routing protocol

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ADVPN with BGP as the routing protocol

This recipe provides sample configuration of ADVPN with BGP as the routing protocol. The following options must be enabled for this configuration: l On the hub FortiGate, IPsec phase1-interface net-device disable must be run.

l IBGP must be used between the hub and spoke FortiGates. l bgp neighbor-group/neighbor-range must be rused.

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 disable

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 BGP:

config router bgp set as 65412 config neighbor-group edit “advpn” set link-down-failover enable set remote-as 65412 set route-reflector-client enable

next

end config neighbor-range edit 1 set prefix 10.10.10.0 255.255.255.0 set neighbor-group “advpn”

next

end config network edit 1 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’ BGP:
  2. Configure Spoke1:

config router bgp set as 65412 config neighbor edit “10.10.10.254”

set advertisement-interval 1 set link-down-failover enable set remote-as 65412

next

end config network

edit 1 set prefix 10.1.100.0 255.255.255.0

next

end

end

  1. Configure Spoke2:

config router bgp set as 65412 config neighbor edit “10.10.10.254”

set advertisement-interval 1 set link-down-failover enable set remote-as 65412

next

end config network edit 1 set prefix 192.168.4.0 255.255.255.0

next

end

end

  1. Run diagnose and get commands to check VPN and BGP 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=1 olast=1 ad=r/2 stat: rxp=1 txp=160 rxb=16428 txb=8969

dpd: mode=on-idle on=1 idle=5000ms retry=3 count=0 seqno=628 natt: mode=none draft=0 interval=0 remote_port=0 proxyid=spoke1 proto=0 sa=1 ref=6 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=1225/0B replaywin=1024 seqno=a1 esn=0 replaywin_lastseq=00000002 itn=0

life: type=01 bytes=0/0 timeout=2369/2400

dec: spi=c53a8f5b esp=aes key=16 cbe88682ad896a69290027b6dd8f7162 ah=sha1 key=20 7bb704b388f83783ac76c2ab0b6c9f7dcf78e93b

enc: spi=6e3633fc esp=aes key=16 1a0da3f4deed3d16becc9dda57537355 ah=sha1 key=20 368544044bd9b82592d72476ff93d5055056da8d

dec:pkts/bytes=1/16364, enc:pkts/bytes=160/19168

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=0 olast=0 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 bgp summary command on Spoke1. The system should return the following:

BGP router identifier 7.7.7.7, local AS number 65412

BGP table version is 2

1 BGP AS-PATH entries

0 BGP community entries

Neighbor  V      AS [[QualityAssurance62/MsgRcvd]] [[QualityAssurance62/MsgSent]] [[QualityAssurance62/TblVer]] InQ OutQ Up/Down State/PfxRcd

10.10.10.254       1.          65412     143     142         1.     1.     1. 00:24:45

2

Total number of neighbors 1

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

Routing table for VRF=0

B  172.16.101.0/24 [200/0] via 10.10.10.254, spoke1, 00:23:57 B   192.168.4.0/24 [200/0] via 10.10.10.254, spoke1, 00:22:03

  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=268 rxb=16428 txb=31243

dpd: mode=on-idle on=1 idle=5000ms retry=3 count=0 seqno=714 natt: mode=none draft=0 interval=0 remote_port=0 proxyid=spoke1 proto=0 sa=1 ref=6 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=345/0B replaywin=1024 seqno=10d esn=0 replaywin_lastseq=00000002 itn=0

life: type=01 bytes=0/0 timeout=2369/2400

dec: spi=c53a8f5b esp=aes key=16 cbe88682ad896a69290027b6dd8f7162 ah=sha1 key=20 7bb704b388f83783ac76c2ab0b6c9f7dcf78e93b

enc: spi=6e3633fc esp=aes key=16 1a0da3f4deed3d16becc9dda57537355 ah=sha1 key=20 368544044bd9b82592d72476ff93d5055056da8d

dec:pkts/bytes=1/16364, enc:pkts/bytes=268/48320

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

—-

name=spoke1_0 ver=1 serial=9 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=17 ilast=4 olast=4 ad=r/2 stat: rxp=1 txp=100 rxb=112 txb=4686 dpd: mode=on-idle on=1 idle=5000ms retry=3 count=0 seqno=231 natt: mode=keepalive draft=32 interval=10 remote_port=4500 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=1422 expire=447/0B replaywin=1024 seqno=65 esn=0 replaywin_lastseq=00000002 itn=0

life: type=01 bytes=0/0 timeout=2368/2400

dec: spi=c53a8f5c esp=aes key=16 73fd9869547475db78851e6c057ad9b7 ah=sha1 key=20 6ad3a5b1028f6b33c82ba494a370f13c7f462635

enc: spi=79cb0f2b esp=aes key=16 52ab0acdc830d58c00e5956a6484654a ah=sha1 key=20 baa82aba4106dc60618f6fe95570728656799239

dec:pkts/bytes=1/46, enc:pkts/bytes=100/11568

npu_flag=03 npu_rgwy=13.1.1.2 npu_lgwy=15.1.1.2 npu_selid=5 dec_npuid=1 enc_npuid=1

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

Routing table for VRF=0

B      172.16.101.0/24 [200/0] via 10.10.10.254, spoke1, 00:23:57

B      192.168.4.0/24 [200/0] via 10.10.10.3, spoke1_0 , 00:22:03

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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