ISP Subnet available on VLAN without NAT

Forum|Forum|3 years ago
July 1, 2022
2 replies
3054 views

Hi i need some help.
I got a customer where we are migrating there current VOIP platform to a new one.
For the new VOIP devices we ordered a IPVPN (Private ISP subnet)
Were trying to handout that subnet from the ISP 192.168.110.2/255.255.255.0 to our VLAN 110 devices.
But i cant get it to work.

Any one got any idea how to implement this?

Help would be great!

FortiGate

A

Anonymous_User

New Contributor III

Hello @Mvthul ,

Thank you for posting on Fortinet Community Forum. As per your configuration, this will not work as you are trying to the same subnet for the trunk interface(internal 3) and the sub-interface(VLAN 110).

You would have to change the IP subnet on the trunk instead.

Thanks,

MvthulAuthor

New Member

So it’s not possible to make the IP subnet coming in on internal 3 to VLAN 110 ? Even with overlapping subnets on? We need to get those devices in VLAN 110 in the 192.168.110.0/24 subnet some how. I know draytek calls it the IP routed subnet feature. But can Fortigate do this also somehow?

Toshi_Esumi

SuperUser

It's possible but has to be a separate subnet. I'm not sure how IPVPN works but I would assume they use a separate subnet from the main interface one. Are your sure about this?

Toshi

Toshi_Esumi

SuperUser

I don't think you can do the same with an FGT. Or replace the DrayTek device with an FGT.

Toshi

MvthulAuthor

New Member

Thanks for ur reply! Ill think of a other solution.

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