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HT_JDC
HT_JDC
New Member
December 1, 2025
Question

2 different LAN subnets within Fortigate

  • December 1, 2025
  • 2 replies
  • 261 views

Dear Experts,

 

By 2 separate vlan switches, can we have 2 different LAN subnets?

Here is an example.

 

"internal" (original vlan switch) has physical ports 1-3. 192.168.10.1/24

New vlan switch called "switch2' has physical ports 4-5. 172.16.1.1/24

Both "internal" and "switch2" have routes to wan.

There is also route between "internal" and "switch2".

 

I tried, however, I cannot realize it. The device is Fortigate 60F.

 

Any comments would be appreciated.

 

Best regards,

 

 

2 replies

HT_JDC
HT_JDCAuthor
New Member
December 1, 2025

Sorry, my mistake and I should have clarified more.

Some of them works now.

 

'internal' has SD-WAN route. The following route cannot be realized.

'switch2' --> 'internal' --> SD-WAN.

 

Any comments would be appreciated.

 

Best regards,

 

 

Toshi_Esumi
SuperUser
Toshi_Esumi
SuperUser
December 1, 2025

Both "internal:192.168.10.0/24" and "switch2:172.16.1.0/24" are on the same FGT(router) and the same routing-table. If you have doubt, you can run "get router info routing-table all" in CLI to see them.
Therefore, you need to have a NAT policy "switch2" -> SD-WAN in addition to "switch2"<->"internal", which you must have set up already. Again the (connected) routes are already there. 

Toshi

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