Different Network Structure

viragomann

Assuming both routers are the default gateways in the network behind, you need to add a static route on each for the network behind the other one.

So on pfSense, you have to add the IP of the Fortigate as a gateway first in System > Routing > Gateways.
Then go to Static routes and add a route for the network behind the Fortigate and selct the gateway you've added before.
On the interface which is facing to the Fortigate uncheck "block private networks" to allow access from the other block.
Also add firewall rules to that interface to allow the desired access.

ahmetakkaya

@viragomann

Thank you
I have a very foreign poor opinion on these issues
I don't know where to start

chpalmer

If you have a spare interface on each of the routers you could set up a subnet both routers share and then run RIP between them..

ahmetakkaya

alt text

network this way
But how should I do it?

chpalmer

Both interfaces on the same subnet. Say 172.20.1.0/30

Routed package on pfsense.

https://kb.fortinet.com/kb/documentLink.do?externalID=FD30031

Then you allow networks from the other side to reach via firewall rules.

You will probably have to allow the pfsense traffic on the Fortinet side as well.

chpalmer

Have you set up the interfaces that you show connected in your picture above?

ahmetakkaya

@chpalmer

I fail ignorant :(

chpalmer

First set up your spare interfaces like this and connect them together.

chpalmer

Add the "Routed" package.

chpalmer

Set up the "Routed" package on the pfsense router and choose the interface that connects to the other Fortinet Router. Pick a password that both sides will share.