Hairpin NAT (VIP) on Fortigate Firewall (Server and clients behind same firewall interface)

 Hairpin NAT (VIP) on Fortigate Firewall

 

Network Diagram:

Scenario1: When both source and the destination is behind the same interface 


 

Configuration:

 config firewall vip
    edit "HAIR-PIN-NAT"
        set uuid 6f5f2122-c0c1-51ec-fe10-0057fadb8b73
        set extip 14.140.40.108
        set mappedip "192.168.0.100"
        set extintf "any"
        set portforward enable
        set extport 12345
        set mappedport 22
    next
end

config firewall policy
    edit 1
        set name "SSH-PORT2-PORT1"
        set uuid f4190a90-c0c1-51ec-38b3-61356f8da7f3
        set srcintf "port2"
        set dstintf "port1"
        set action accept
        set srcaddr "all"
        set dstaddr "HAIR-PIN-NAT"
        set schedule "always"
        set service "ALL"
        set nat enable
    next
    edit 2
        set name "NAT-INTERNAL_HAIR_PIN"
        set uuid 22a25094-c0cf-51ec-5470-efedd3f4fd16
        set srcintf "port1"
        set dstintf "port2"
        set action accept
        set srcaddr "all"
        set dstaddr "all"
        set schedule "always"
        set service "ALL"
        set nat enable
    next
end

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