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Forum Discussion
M4v3r1cK87
Jan 04, 2026Aspirant
[MS108TUP] - Switching - VLAN and routing
Hello everyone, I've this network configuration: Firewall --> MS108TUP --> Access Point Wifi The firewall and the AP is not a Netgear product. I've a domotic house so I've decided to separa...
M4v3r1cK87
Jan 05, 2026Aspirant
Hi schumaku
I've configured the interface of the firewall as "VLAN" (not bridge), in this way the firewall create a new network with is own DHCP Server and subnet.
I think that all pass throught the firewall, because is the firewall that "generate" the VLAN.
So, if the devices take the IP from the firewall, why the traffic not pass throught it also in "intra-VLAN"?
schumaku
Jan 05, 2026Guru - Experienced User
M4v3r1cK87 wrote:I've configured the interface of the firewall as "VLAN" (not bridge), in this way the firewall create a new network with is own DHCP Server and subnet.
I think that all pass through the firewall, because is the firewall that "generate" the VLAN.
Two VLANs, and both are in the same IP subnet - reads like an illegal config for your unknown firewall (make, model, firmware). or in fact for any common router in general.
Such a firewall should not accept such a configuration - regardless of a device with a security zone concept like e.g a ZyXEL - it can't deal with, since at the end of the day its a router and it can and will work as a basic router. So two IP networks with the same subnet and address range will never work...
- StephenBJan 05, 2026Guru - Experienced User
schumaku wrote:
So two IP networks with the same subnet and address range will never work...
M4v3r1cK87: What you need to do is
- put all your IoT devices on a different VLAN from your "main" network devices
- use different subnets for the main network and the IoT network
This won't isolate IoT (or main network) devices from each other, but it will ensure that all traffic going between the two networks runs through the firewall,
- M4v3r1cK87Jan 05, 2026Aspirant
Hello StephenB
It's already done, but my interesting is to isolate the traffic between devices in the same VLAN. Seems that I need to create a "bridge" interface.
- StephenBJan 05, 2026Guru - Experienced User
M4v3r1cK87 wrote:
Seems that I need to create a "bridge" interface.
I don't see how that will help.
You could try setting up the IoT VLAN as a private VLAN in the switch. See page 168 in the manual.
- https://www.downloads.netgear.com/files/GDC/MS108TUP/MS108TUP_UM_EN.pdf
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