Support Forum
The Forums are a place to find answers on a range of Fortinet products from peers and product experts.
FTGmaster
New Contributor

How to set Public IP behind on a Internal Port

Hi Ive a problem: I need to install a FGT 80C behind another FGT 110C. I need to set up the 80C wan port as on of my public IP. Schema: Internet with my range of public ip/29 >> 110c WAN 1 PPPoE with one of my IP available I need one of my Public IP behind my 110C, to set the 80C Wan 1 Port (connected to one of my 110C Internal Port available) with the public IP. I know that I can do the 1-1 Nat with Virtual IP, but in this case I' d Like to use the public IP directly. thank You

FCNSA - FCNSP Certified FortiGate 20D - 30B - 40C - 50B - 60B - 60C - 80C - 100D - 110C FortiAnalyzer 100C FortiAP 220B HA

FCNSA - FCNSP Certified FortiGate 20D - 30B - 40C - 50B - 60B - 60C - 80C - 100D - 110C FortiAnalyzer 100C FortiAP 220B HA
5 REPLIES 5
ede_pfau
SuperUser
SuperUser

IMHO there are 2 solutions to this: 1. use a switch in front of the 110C (gateway FW) and connect both firewalls to this switch 2. use a VIP without port mapping to transparently hand over the traffic I don' t see any disadvantages in using a VIP (a.k.a. 1:1 NAT) if you don' t port-forward. You have full control over the 80C WAN traffic but the 80C won' t notice any difference to a ' real' WAN connection.

Ede

"Kernel panic: Aiee, killing interrupt handler!"
Ede"Kernel panic: Aiee, killing interrupt handler!"
FTGmaster
New Contributor

But I can' t setup the IP port: PPPoE to internet MYpubIP.110 as GW << FGT 110C [ MYpubIP.112 >> eth2/port2] >> eth2 >> wan80C >> FGT 80C [Wan Port = MYpubIP.112]

FCNSA - FCNSP Certified FortiGate 20D - 30B - 40C - 50B - 60B - 60C - 80C - 100D - 110C FortiAnalyzer 100C FortiAP 220B HA

FCNSA - FCNSP Certified FortiGate 20D - 30B - 40C - 50B - 60B - 60C - 80C - 100D - 110C FortiAnalyzer 100C FortiAP 220B HA
ede_pfau
SuperUser
SuperUser

??? Of course the VIP will only work if you get ' fixed' IP addresses via PPPoE. Can you tell me why this will not work? Ah, OK, I see...same subnet on 2 ports of the 110C! So, take solution no. 1 - a WAN switch in front of both firewalls.

Ede

"Kernel panic: Aiee, killing interrupt handler!"
Ede"Kernel panic: Aiee, killing interrupt handler!"
FTGmaster
New Contributor

A switch before the wan port? and how can I set the IP? ISP ROUTER >> switch << FTG I think a solution could be use the group/zone.

FCNSA - FCNSP Certified FortiGate 20D - 30B - 40C - 50B - 60B - 60C - 80C - 100D - 110C FortiAnalyzer 100C FortiAP 220B HA

FCNSA - FCNSP Certified FortiGate 20D - 30B - 40C - 50B - 60B - 60C - 80C - 100D - 110C FortiAnalyzer 100C FortiAP 220B HA
AtiT
Valued Contributor

I' m just wondering if you need to have FTG80C connected after 110C. If not, there is another question whether there is a possibility to use the FTG110C' s switch (port1 - port8 I think) for WAN connection - assign your public IP with /29 mask to port1 of the FTG110C and use his port2 for the FTG80C wan connection. Will it work? The switchports are under one subnet...

AtiT

AtiT
Labels
Top Kudoed Authors