UTM Setup multiple VLANS on the same interface

Hi badrobot,

yes it is possible to run run multiple VLANs on the same interface.

Just create an ethernet vlan interface on the utm with the desired vlan tag and physical interface.

Hi Badrobot 

It is possible to set up multiple VLANs on a single interface. As suggested by DKKDG you just need to create one. If you want to refer to any KBAs, please check these Sophos UTM - How to define a network interface and check Ethernet VLAN type.

Ok but do I also need to create NAT rules and Firewall rules as well, I read that somewhere else in here but I want to walk through each aspect since changes like this typically require downtime, most of the switches are setup so i just need to configure the firewall now.

Hi Badrobot,

Yes, you should consider each networked subnet/interface on your UTM needing rules/nats and masquerades where needed.

The UTM is a stateful firewall that is in default drop fallback so unless you allow from one network to another/network to internet it will be blocked.

Emile

VLAN tags are used at Layer 2.  NAT and Firewall rules apply to Layer 3.  Consider #3.1 in Rulz (last updated 2019-04-17).

Cheers - Bob

OK this all helps thanks everyone so much, my next issue is the VLAN 1.  Basically from what I have read is the UTM reserves VLAN 1 for wireless? Could be wrong but just in case......Is it possible to change this?  I ask because we are using D link switches and they reserve VLAN 1 for management, this appears as though it cannot be changed on the D-Links either so I am hoping you can alter this in someway on the UTM to use VLAN 1 for something else.

Are there any KB's that also explain how to handle the NAT and Masquerade aspects when creating Vlans...  I would think it would be the same as any other but wanted to check.

I suspect that, if you aren't using Wireless Protection and have everything turned off in there that you might be able to use VLAN 1.  Please come back and tell us if that worked for you.

As you assumed, a VLAN is just like any other LAN and in need of the same NAT/Masq rules.  Think of a VLAN tag as being like a television channel - the receiver "sees" all the channels, but only picks one at a time.  That's how a VLAN Interface works - it only looks for the tag you define in WebAdmin.

Cheers - Bob

My only issue is would like to use wireless, I am wondering what would happen though if I did wireless on a separate interface, with no NAT rules to each other.  

Or what I should say is-

Is the wireless tied to a vlan always?  or can you give it it's own interface and simply a subnet without the vlan, still freeing up vlan 1 for another interface?